QT40.241-IOL
24V, 40A, THREE PHASE INPUT

Q-Series

POWER SUPPLY
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PRODUCT DESCRIPTIONThe QT40.241-IOL is a high-quality DIN rail power supply
based on the popular QT40 series.
Via the integrated IO-Link interface, the unit provides
access to real-time and recorded data, informing about
the condition of the power supply itself and the powerline.
Amongst many electrical operation parameters foradvanced diagnostics, event signals are available as well
as remote control for shutdown and the “Parallel Use”
feature for load sharing between power supplies
connected in parallel.
Like its series members, the QT40.241-IOL comes withadvanced features. It offers 50% BonusPower, providing
large power reserves to support the starting of heavyloads such as DC motors or capacitive loads. Highimmunity to transients and power surges, as well as low
electromagnetic emission, make usage in nearly every
environment possible.

ORDER NUMBERS
Power Supply
Accessory

QT40.241-IOL
ZM2.WALL
UF20.241
YR80.2413AC 380-480V wide-range input
Three input fuses included
With IO-Link communication interface
Width only 110mm, weight only 1.5kg
95.3% full load and excellent partial load efficiencies
50% BonusPower, 1440W for up to 5s
100A peak current for 10ms for easy fuse tripping
Active PFC (power factor correction)
Active filtering of input transients
Negligible low input inrush current surge
Full power between -25°C and +55°C
Current sharing feature for parallel use
Remote control of output voltage
Remote control of shut-down
3 Year warranty

SHORT-FORM DATA
Output voltage
Adjustment range
Output current

DC 24Vnominal15 – 28.5Vdc
factory setting 24.1V
Continuous:
40 - 33.7A
up to +55°C ambient
27.5 - 23.2A
at +70°C ambient
Short-term, up to 5s:
60 - 50.5A
up to +70°C ambient
Derate linearly between +55°C and +70°C
Output power
960W
continuous
1440W
short term (5s)Output ripple< 100mVpp
20Hz to 20MHz
AC Input voltage
3AC 380-480V-15%/+10%
3AC 480V+20% max. 5sec
Mains frequency
50-60Hz±6%
AC Input current
1.58 / 1.3A
at 3x400 / 480Vac
Power factor
0.92 / 0.93
at 3x400 / 480Vac
AC Inrush current
typ. 4.5 / 4.5Apeakat 3x400 / 480Vac
Efficiency
95.3 / 95.2%
at 3x400 / 480Vac
Power losses
47.3 / 48.4W
at 3x400 / 480Vac
Temperature range -25°C to +70°C
operational
Derating
20W/°C+55°C to +70°C
Hold-up time
typ. 25 / 25ms
at 3x400 / 480Vac
Size (wxhxd)
110x124x143.5mm without DIN rail
Weight1500g

MAIN APPROVALS
with IO-Link interface
Wall mount bracket
Buffer unit
Redundancy module

For details and the complete approval list, see chapter 22.

UL 61010-2-201

Semi F47

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

INDEX
Page
1. Intended Use .......................................................3
2. Installation Requirements ...................................3
3. AC Input ...............................................................4
4. Input Inrush Current ...........................................5
5. DC Input ...............................................................5
6. Output .................................................................6
7. Hold-up Time .......................................................8
8. IO-Link Interface..................................................9
9. Remote Control of Shut-down .........................13
10. Remote Control of Output Voltage .................13
11. Efficiency and Power Losses..............................14
12. Lifetime Expectancy and MTBF.........................15
13. MTBF ..................................................................15
14. Functional Diagram...........................................16
15. Terminals and Wiring ........................................17
16. Front Side and User Elements ...........................18
17. EMC ....................................................................19
18. Environment ......................................................20
19. Protection Features ...........................................21
20. Safety Features ..................................................21
21. Dielectric Strength ............................................22
22. Approved, Fulfilled or Tested Standards .........23Page
23. Regulatory Product Compliance ...................... 23
24. Physical Dimensions and Weight ..................... 24
25. Accessories ........................................................ 25
25.1. ZM2.WALL - Wall mounting bracket ....... 25
25.2. UF20.241 - Buffer module ........................ 25
25.3. YR80.241 - Redundancy Module .............. 26
26. Application Notes ............................................. 27
26.1. Repetitive Pulse Loading .......................... 27
26.2. Peak Current Capability ........................... 28
26.3. External Input Protection ......................... 28
26.4. Using only 2 Legs of a 3-Phase System .... 29
26.5. Charging of Batteries ............................... 30
26.6. Output Circuit Breakers............................ 30
26.7. Parallel Use to Increase Output Power .... 31
26.8. Parallel Use for Redundancy .................... 31
26.9. Series Operation ....................................... 32
26.10. Inductive and Capacitive Loads................ 32
26.11. Back-feeding Loads .................................. 32
26.12. Use in a Tightly Sealed Enclosure ............ 32
26.13. Mounting Orientations ............................ 33

The information presented in this document is believed to be accurate and reliable and may change without notice.
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

TERMINOLOGY AND ABREVIATIONSPE andsymbolPE is the abbreviation for Protective Earth and has the same meaning as the symbol.

Earth, Ground

This document uses the term “earth” which is the same as the U.S. term “ground”.

t.b.d.

To be defined, value or description will follow later.

AC 400V

A figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)

400VacA figure with the unit (Vac) at the end is a momentary figure without any additional
tolerances included.

50Hz vs. 60Hz

As long as not otherwise stated, AC 230V parameters are valid at 50Hz mains frequency.

may

A key word indicating flexibility of choice with no implied preference.

shall

A key word indicating a mandatory requirement.

shouldA key word indicating flexibility of choice with a strongly preferred implementation.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QT40.241-IOL
Q-Series

24V, 40A, THREE PHASE INPUT

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for commercial use, such as in industrial control,
process control, monitoring and measurement equipment or the like. Do not use this device in equipment where malfunction
may cause severe personal injury or threaten human life without additional appropriate safety devices, that are suited for theend application.
If this device is used in a manner outside of its specification, the protection provided by the device may be impaired.
Do not connect the IO-Link port to any other equipment except industrial control equipment.

2. INSTALLATION REQUIREMENTSWARNING

Risk of electrical shock, fire, personal injury or death.

- Turn power off before working on the device and protect against inadvertent re-powering.
- Do not open, modify or repair the device.
- Use caution to prevent any foreign objects from entering into the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surface may cause burns.
Obey the following installation instructions:This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to thefactory for inspection.
Install device in an enclosure providing protection against electrical, mechanical and fire hazards.
Install the device onto a DIN rail according to EN 60715 with the input terminals on the bottom of the device. Other
mounting orientations require a reduction in output current.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that aredesigned for a minimum operating temperature of +60°C for ambient temperatures up to +45°C, +75°C for ambient
temperatures up to +60°C and +90°C for ambient temperatures up to +70°C.
Ensure that all strands of a stranded wire enter the terminal connection. Use ferrules for wires on the input terminals. Unused
screw terminals should be securely tightened.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The device is designed for overvoltage category II zones. Below 4000m altitude the device is tested for impulse withstandvoltages up to 4kV, which corresponds to OVC III according to IEC 60664-1.
The device is designed as “Class of Protection I” equipment according to IEC 61140. Do not use without a proper PE(Protective Earth) connection.
The device is suitable to be supplied from TN, TT or IT mains networks , grounding of one phase is allowed. The continuous
voltage between the input terminals and the PE potential must not exceed 528Vac.
A disconnecting means shall be provided for the input of the device.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do not coverventilation grid!
The device is designed for altitudes up to 5000m. Above 2000m a reduction of output current is required. Above 3000m a
reduction of overvoltage category is required.
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side. Increase
the 5mm to 15mm in case the adjacent device is a heat source. When the device is permanently loaded with less than 50%,
the 5mm can be reduced to zero.
The device is designed, tested and approved for branch circuits up to 32A (IEC) and 30A (UL) without additional protection
device. If an external fuse is utilized, do not use circuit breakers smaller than 6A B- or C-Characteristic to avoid a nuisancetripping of the circuit breaker.
The maximum surrounding air temperature is +70°C. The operational temperature is the same as the ambient or surrounding
air temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.
The supply voltage for the IO-Link must be powered from a PELV or SELV source or an "Isolated Secondary Circuit" in order tomaintain a SELV or PELV output.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

3. AC INPUT
AC inputsuitable for TN, TT and IT mains networks,
grounding of one phase is allowed except in UL 508
applications
continuous operation
short-time operation±6%
steady-state value, load independent, see Fig. 3-1
steady-state value, load independent, see Fig. 3-1

nom.

3AC 380-480V

Input frequency
Turn-on voltage
Shut-down voltage

nom.
typ.
typ.

3x 323-528Vac
3x 528-576Vac
50–60Hz3x 305Vac
3x 275Vac

Input current

typ.

3AC 400V
1.58A

3AC 480V
1.3A

Power factor1)
Start-up delay
Rise time

typ.
typ.
typ.
typ.
max.

0.92
200 - 500ms
80ms
80ms
500mV

0.93
200 - 500ms
80ms
80ms
500mV

AC input range

Turn-on overshoot

The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.

Fig. 3-1 Input voltage range

POUT

Fig. 3-2 Turn-on behaviour, definitions

Rated input range

L1 L2 L3

Turn-onShut-down

max 5s

VIN
275V 305V

323V

Fig. 3-3 Input current vs. output load at 24V

1.6A
1.4
1.2
1.0
0.8
0.6
0.4
0.2

A: 3x 400Vac
B: 3x 480Vac- 5%

OutputVoltageStart-up
delay

528V 576Vac

Input Current, typ.

0

Input
Voltage

B

Rise
Time

Fig. 3-4 Power factor vs. output load at 24V

0.95
A

Overshoot1)

at 24V, 40A, symmetrical phase voltages,
see Fig. 3-3
at 24V, 40A, see Fig. 3-4
see Fig. 3-2
at 24V, 40A, resistive load, 0mF see Fig. 3-2
at 24V, 40A, resistive load, 40mF see Fig. 3-2
see Fig. 3-2

Power Factor, typ.
B

0.90

A

0.85
A: 3x 400Vac
B: 3x 480Vac

0.80
0.75
Output Current

4

8 12 16 20 24 28 32 36 40A

Output Current

0.70
4

8 12 16 20 24 28 32 36 40A

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QT40.241-IOL
24V, 40A, THREE PHASE INPUT

Q-Series

4. INPUT INRUSH CURRENT
The power supply is equipped with an active inrush current limitation circuit, which limits the input inrush current
after turn-on to a negligible low value. The input current is usually smaller than the steady state input current.

Inrush current1)
Inrush energy
Inrush delay
1)

max.
typ.
max.
typ.

3AC 400V
6Apeak
4.5Apeak
1.5A2s500ms

3AC 480V
6Apeak
4.5Apeak
1.5A2s
600ms

over entire temperature range
over entire temperature range
over entire temperature range

The charging current into EMI suppression capacitors is disregarded in the first microseconds after switch-on.
Fig. 4-1 Typical turn-on behaviour at nominal
load and +25°C ambient temperature

5. DC INPUT
Do not operate this power supply with DC input voltage.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QT40.241-IOL
24V, 40A, THREE PHASE INPUT

Q-Series

6. OUTPUT
Output voltage
Adjustment range
Factory settingLine regulation
Load regulation

Ripple and noise voltage
Output current

Output power
BonusPower time
BonusPower recovery time

nom.
typ.
typ.
typ.
max.
max.
typ.

24V
15-28.5V
24.1V
24.1V
25.1V
10mV
50mV
1000mV

max.
nom.
nom.
nom.

120mVpp
40A
33.7A
60A

nom.

50.5A

typ.

100A

nom.
nom.
typ.
typ.

960W
1440W
5s
10s
continuous
current
40A
44A
60A
68A
46A
51A
190A
10 200µF

Overload behaviour
Short-circuit current2)

Output capacitance
1)

2)

min.
max.
min.
max.
typ.
max.
typ.
typ.

guaranteed±0.2%, at full load, cold unit
±0.2%, at full load, cold unit, in “parallel use” modeat no load, cold unit, in “parallel use” mode
3x 323-576Vac
static value, 0A40A, see Fig. 6-1
in “parallel use” mode: static value, 0A40A,
see Fig. 6-2
20Hz to 20MHz, 50Ohm
continuously available at 24V, see Fig. 6-1 and Fig. 6-2
continuously available at 28.5V, see Fig. 6-1 and Fig. 6-2
short term (5s) available BonusPower1), at 24V,
see Fig. 6-1, Fig. 6-2 and Fig. 6-3
short term (5s) available BonusPower1), at 28.5V,
see Fig. 6-1, Fig. 6-2 and Fig. 6-3
up to 10ms, output voltage stays above 20V, see Fig.
6-3, This peak current is available once every second.
See chapter 26.2 for more peak current measurements.
continuously available at 24-28.5V
short term available BonusPower1) at 24-28.5V
duration until the output voltage dips, see Fig. 6-2
overload free time to reset power manager, see Fig. 6-4
see Fig. 6-1
continuous, load impedance 25mOhm, see Fig. 6-1
continuous, load impedance 25mOhm, see Fig. 6-1
short-term (5s), load impedance 25mOhm, see Fig. 6-1
short-term (5s), load impedance 25mOhm, see Fig. 6-1
continuous, load impedance <10mOhm
continuous, load impedance <10mOhm
up to 10ms, load impedance <10mOhm, see Fig. 6-4
included in the power supply

BonusPower, short term power capability (up to typ. 5s)
The power supply is designed to support loads with a higher short-term power requirement without damage or shutdown. The shortterm duration is hardware controlled by an output power manager. This BonusPower is repeatedly available. Detailed information canbe found in chapter 26.1. If the power supply is loaded with the BonusPower longer than shown in the bonus-time diagram (see Fig.
6-2), the max. output power is automatically reduced to 960W.
Discharge current of output capacitors is not included.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QT40.241-IOL
24V, 40A, THREE PHASE INPUT

Q-Series

Fig. 6-1 Output voltage vs. output current in“single use” mode, typ.

Output Voltage

28V

Adjustment Range
A

24

Fig. 6-2 Output voltage vs. output current in“parallel use” mode, typ.
Output Voltage (Parallel Use, typ.)

30V
28
26
24
22
20
18
16
14

B

20
16

B

A

12

Continuously
available
B Short-term (5s)
BonusPower

A

8
4
0
0

10

20

30

50

40

70A

60

Factory
settin g

A

B

A Con tinu ously

available

B Short-term (5s)

0

20

10

Fig. 6-3 Bonus time vs. output power

B

A

BonusPower3040

Output Current

50

60A

Output Current

Fig. 6-4 Dynamic overcurrent capability, typ.
Output Vol tage (dynamic behavior, < 10ms)

Bonus Time

28V
24
20
16
12
8
4
0

6s
5
4
3
2
1
110

Adjustment Range

Output Power

120

130

140

150

160%

Adjustment Range

0

40

80

120

160

200A

Output Current

Fig. 6-5 BonusPower recovery time
Limitation by
Power Manager

Power
Demand100%t

OutputVoltage

Bonus
Time

Recovery Time
Bonus Power disabledt

The BonusPower is available as soon as power comes on and after the end of an output short circuit or output
overload.
Fig. 6-6 BonusPower after input turn-on

Fig. 6-7 BonusPower after output short

Short ofOutput

Input
Voltage

OutputVoltage

OutputVoltage150%
Output
Power

100%

Bonus
Power

Output
Power

150%

Bonus
Power

100%

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/33

QT40.241-IOL
24V, 40A, THREE PHASE INPUT

Q-Series

7. HOLD-UP TIME
Hold-up Time

1)

typ.
min.
typ.
min.

3AC 400V1)
50ms
40ms
25ms
20ms

3AC 480V1)
50ms
40ms
25ms
20ms

at 24V, 20A, see Fig. 7-1
at 24V, 20A, see Fig. 7-1
at 24V, 40A, see Fig. 7-1
at 24V, 40A, see Fig. 7-1

Curves and figures for operation on only 2 legs of a 3-phase system can be found in chapter 26.4.
Fig. 7-1 Hold-up time vs. input voltage

Hold-up Time

Fig. 7-2 Shut-down behaviour, definitions

24V, 20A, typ.

50ms

24V, 20A, min.

40
30

24V, 40A, typ.

20

24V, 40A, min.

10

L1 L2 L3

Input
Voltage

Hold-up Time

Input Voltage

0
320

360

400

440

- 5%

OutputVoltage

3x480VacAug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QT40.241-IOL
24V, 40A, THREE PHASE INPUT

Q-Series

8. IO-LINK INTERFACE
This power supply is equipped with an IO-Link interface compliant to IO-Link protocol V1.1 (M12 male, A-coded) on
the device front side and can be connected to any IO-Link-masters compliant to V1.1 of IO-Link protocol. The Pin
Assignment is shown in Fig. 8-1.
It is possible to operate the power supply without IO-Link communication. Due to a built-in EEPROM, the power supply
can also be operated with values which have previously been updated via IO-Link also in case of no IO-Link-master isconnected or in case of defective IO-Link connection.
Via IO-Link the power supply can communicate current status, in-/output values and it is also possible to configure theoutput voltage (see chapter 10 Remote Control of Output Voltage) as well as to remotely shut-down the power supply(described in chapter 9 Remote Control of Shut-down) and switch between single and parallel operation (see chapter
25.7 / 25.8).
Fig. 8-1 IO-Link Interface Pin Assignment

To operate the IO-Link interface it is necessary to install/upload the IODD-File (IO-Link Device Description) to theconnected IO-Link master. The most recent IODD file can be found on IODDfinder (https://ioddfinder.io-link.com) oron the PULS website (www.pulspower.com) in the download section of the product page of QT40.241-IOL. The device
can also
be accessed via IO-Link, if the power supply is not connected to AC-mains and in a switched off mode.
To get full performance, it is recommended to use IO-Link-masters
with V1.1

IO-Link version

V1.1

Bit rate
Minimum cycle timeSIO-Mode support
Process data length

COM3 (230.4 kBaud)2ms
no48bit, 6byte

Cycle time refers to the process data communication speed

The power supply provides three types of data via IO-Link.
Process data
Process data refers to data that is periodically sent to the IO-Link-master. The length is 6Byte and the data iscommunicated every 2ms. All other data in the power supply itself is generated every 50ms and stored in the IO-Link
registers.
Parameter values
The parameter values can be accessed to read out additional data (e.g. operating time, temperatures etc.), but in
addition some of these values can also be written by the user to configure the power supply (e.g. output voltage andremote on/off).
EventsThis information is triggered by certain situations and will result in an event notification to the IO-Link-master. Typicalevents are notification in case of ideal (e.g. DC-OK) and non-ideal situations (e.g. ambient temperature too hot, highinput voltage etc.).
Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/33

QT40.241-IOL
Q-Series

24V, 40A, THREE PHASE INPUT

All data types used in QT40.241-IOL are listed and described in the following. For additional information on remote
shut-down as well as output voltage adjustment, please refer to chapter 9 and 10.
Cyclic Data – Process Data
Output current (A)Output voltage (V)Input voltage (Vrms)

Output current value (2 Bytes) between 0-80A to monitor current load attached to the power
supply with an accuracy of 800mA. This value is updated to the IO-Link-master every 2ms.
Output voltage value (2 Bytes) between 0-40V to monitor the output voltage with an accuracyof 300mV. This value is updated to the IO-Link-master every 60ms.
Input voltage value (2 Bytes) between 0-1130V to monitor the input voltage with an accuracyof 12V. This value is updated to the IO-Link-master every 60ms.

Acyclic Data – Parameters
Function tag
Location tag
User specific marking
Output voltage
setpoint

Stress level

Remaining life time

Temperature airflow

Max. temperature
airflow
Temperature primaryinsideMax. temperature
primary inside
Operating time

User specific number or text with a maximum of 32 bytes(R/W)
User specific number or text with a maximum of 32 bytes(R/W)
User specific number or text with a maximum of 32 bytes(R/W)
Adjustment value of output voltage (V), pre-set to 24.1V;
This value is stored in the EEPROM of the power supply. In case of no IO-Link communication,
the power supply remains to the adjusted output voltage.
Only update this data when the power is running and there is an active connection to the
IO-Link-master (R/W). For additional information regarding remote control of output voltage,
see chapter 10.
Average value in (%); The stress level is calculated between output current in relation to the
maximum allowed output current.
(read-only)
Estimated lifetime in percent (%); based on the power supply’s capacitor temperature, thispercentage value decreases over time and can be used for preventive maintenance. Highcapacitor temperatures accelerate the decrease of lifetime. Please note, that an expired life
time does not indicate a break-down of a power supply, but it indicates, that wear-out andaging might impact the originally specified values. (read-only)
Incoming air temperature (°C) between -45°C to +150°C; the power supply is equipped with athermal sensor on the bottom of the device. Since this product is convection cooled, this value
gives an indication of the ambient air temperature. To use this feature, it is mandatory tomount the device in an upright position (orientation A), as explained in chapter 26.13. Other
mounting orientations might be subject to high temperature warnings as described in thesection “events”.
(read-only)
Recorded maximum temperature (°C) between -45°C to +150°C since last turn on of power
supply (read-only)
Component temperature (°C) on the primary side inside the power supply; values between 45°C to +150°C (read-only)
Recorded maximum temperature on the primary side inside the power supply since last turnon; value between -45°C to +150°C(read-only)
Cumulated overall operating time in hours (h) stored in power supply’s EEPROM;
maximum value: 262800h = 30 years(read-only)

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Cumulated overall operating time in minutes (min) stored in power supply’s EEPROM;
maximum value: 59min(read-only)
Overall amount of significant input transients, that are detected by the power supply’s input
stage;
Transient counterMaximum value: 7200000
overall(read-only)
Overall amount of significant input transients, that are detected by the power supply’s input
Transient counter last stage;
2 minutes
Maximum value: 7200000(read-only)
RMS value of input voltage (V); maximum value: 1130V
Actual input voltage(read-only)
Value of the actual output voltage (V); maximum value: 40VThis value shows the actual output voltage and can be used to detect feedback voltages in the
Actual output voltage DC grid. If the actual output voltage is higher than the adjusted output voltage of the power
supply, a back-feeding load is active.
(read-only)
Cumulated number of power supply turn-ons; this value is stored in the EEPROM of the power
supply.
Turn-on counterMaximum value: 7200000(read-only)
Operating time in hours (h) since last power supply bootup;
Uptime since last turnMaximum value: 1000000
on(read-only)
Operating time in minutes (min) since last power supply bootup
Uptime since last turnMaximum value: 59
on(read-only)“0”: EEPROM ok“1”: Recoverable error  reset to factory setting
EEPROM Status“2”: Unrecoverable error contact support
A logic "1" turns output off and a logic “0” turns on the output again.
Please refer to chapter 9 for further information to shut-down the power supply output. To use
this feature it is essential not to power the IO-Link-master from the power supply, which has
Shut down
received a remote shut-down signal.
(R/W)“0”: Single mode of power supply enabled (factory setting)“1”: Parallel mode of power supply enabled;
Parallel mode enabled
Automated load regulation between two separate power supplies; Set all output voltages tothe same value. (s. chapter Application Notes) (R/W)
Operating time

Acyclic Data – Events
DC-OK
DC Warning
BonusPowerOver temperature(capacitors)
Over temperature(airflow)

As soon as the output voltage reaches 90% of the adjusted output voltage.
As soon as the output voltage dips more than 10% below the adjusted output voltage.
Short dips will be extended to a signal length of 250ms. Dips shorter than 1ms will be ignored.
Power supply provides BonusPower and the output current >105%, please see Fig. 6-1
Temperature of capacitors is too high; operating the power supply with hot capacitors
decreases the lifetime of the power supply. Please review ambient temperature (airflow
temperature) and/or cross check load profile.
Inside air temperature sensor detects a to high temperature; it is mandatory to mount thedevice in an upright position (orientation A), as explained in chapter 26.13. Other mounting
orientations might be subject to misleading high temperature warnings.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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OverloadHigh voltage on input
Low voltage on input

Power supply down

Predictive
maintenancerecommended
2-Phase operation

Humidity

24V, 40A, THREE PHASE INPUT

Device operates in current limiting mode, please see Fig. 6-1. The current is limited actively to
40A (24V reference). Please check wiring on connection resistance and/or review load’s power
demand.
Input voltage above the specified value of 576Vac; please check application on the input of
power supply.
Input voltage below the specified value of 323Vac; please check application on the input of
power supply.
Input power supply failures; this event is triggered, if the communication board lost connection
to the power supply controller. It indicates an AC power down or a defective power supply.
Please refer to log events in the master/PLC to find information on the root cause (e.g. low
input voltage) and check if other events (e.g. high temperature warnings) have been active.
The events are not logged in the power supply, so it is recommended to log events in themaster/PLC.
Operating hours exceeded the calculated lifetime hours; this event recommends preventive
exchange of the power supply. Please note, that an expired life time does not indicate a breakdown of a power supply, but it indicates, that wear-out and aging might impact the originallyspecified values.
Indicates a missing leg of the 3-phase if unit is loaded with more than 20A, see chapter Using
only 2 Legs of a 3-Phase System 26.4; please check input wiring and if intended 2-Phase
operation, please note reduced performance as described in chapter 26.4.
Humidity too high or water condensation on power supply; To avoid personal injury, turn off
the power before checking the condition of power supply. To avoid severe condensation
damage, ensure the environmental requirements in chapter 17.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

9. REMOTE CONTROL OF SHUT-DOWN
To use this feature it is essential not to power the IO-Link-master from the power supply, which is subject to remote
shut-down itself. Please assure an independent power supply for the IO-Link-master according to the specification of
the master (e.g. 8-port IO-Link-masters can typically be operated with PULS PIM90.241 or CP5.241 or CT5.241) and do
use the IO-Link power supply QT40.241-IOL only for powering the load lines.
This feature allows a switch-off of the output of the power supply with a logic “1” in the acyclic parameter data set“Shut down”, described in chapter 8. The shut-down occurs immediately while the turn-on is delayed up to 350ms. In ashut-down condition, the output voltage is <2V and the output power is <0.5W.
There are two typical use cases for remote shut-down of the device:
A. Energy Saving
Input
Power losses

380Vac
480Vac
1.5W
1.5W
with activated shut-down
9.5W
9.8W
at 24V, 0A (no load)
Using remote shut-down will therefore result in a saving of 8.3W. Assuming 8 hours of downtime every workday, thisfeature can generate a saving of 8h*5*4*8.3W= 1.33kWh per month and per power supply.

B.

MaintenanceIn case of maintenance situation, where loads have to be disconnected but sensor voltages have to stay available, theremote shut-down function can be used. Please note, that the communication protocol is IO-Link V1.1 and not IO-Link
Safety; for safety relevant shut-downs, it is prohibited to use this function.

10. REMOTE CONTROL OF OUTPUT VOLTAGE
The standard pre-set value of the output voltage is 24.1V, but the power supply can be set to any output voltage
between 15V to 28.5Vdc via IO-Link using the acyclic parameter data set “Output voltage setpoint” as mentioned inchapter 8. The pre-set value is stored in the EEPROM of the power supply, so that the power supply keeps the adjusted
output voltage also in case of no IO-Link communication or if the power supply is disconnected from AC-mains. Only
update this data when the system is running and there is an active connection to the IO-Link-master.
Please be aware, that repeatedly changing the output voltage of more than 4V reduces the lifetime. We recommend
not adjusting the output voltage more than 50 times per day when the adjustment is larger than 4V.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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11. EFFICIENCY AND POWER LOSSES
Efficiencies for 3-phase operation:
Efficiency
Average efficiency1)

typ.
typ.

3AC 400V
95.3%
94.7%

3AC 480V
95.2%
94.6%

Power losses

typ.
typ.
typ.
typ.

1.5W
9.5W
24.1W
47.3W

1.5W
9.8W
25.0W
48.4W

1)

at 24V, 40A
25% at 10A, 25% at 20A, 25% at 30A, 25%
at 40A
with activated shut-down
at 24V, 0A (no load)
at 24V, 20A (half load)
at 24V, 40A (full load)

The average efficiency is an assumption for a typical application where the power supply is loaded with 25% of the nominal load for 25%of the time, 50% of the nominal load for another 25% of the time, 75% of the nominal load for another 25% of the time and with 100%of the nominal load for the rest of the time.

Efficiencies when using only 2 legs of a 3-phase system:
Efficiency
Power losses
2)

2AC 400V
94.4%2)
56.9W2)typ.
typ.

2AC 480V
94.7%2)
53.7W2)at 24V, 40A
at 24V, 40A (full load)

Curves can be found in chapter 26.4
Fig. 11-1 Efficiency vs. output current at 24V,
typ.

Fig. 11-2 Losses vs. output current at 24V,
typ.

Efficiency

Power Losses

96%

3x400Vac95

3x480Vac

94

60W

3x480Vac50403x400Vac

30
20

93

10

Output Current

92
8

12

16

20

24

28

32

Output Current

0
36 40A

Fig. 11-3 Efficiency vs. input voltage at 24V,
40A, typ.

0

4

8

12 16 20 24 28 32 36 40A

Fig. 11-4 Losses vs. input voltage at 24V, 40A,
typ.

Efficiency

Power Losses

95.5%

50W

95.4

49

95.3

48

95.2

47

95.1

46

95.0

45

Input Voltage

94.9
350

400

450

Input Voltage

44

500 3x550Vac

350

400

450

500 3x550Vac

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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12. LIFETIME EXPECTANCY AND MTBF
The calculated lifetime expectancy shown in the table indicates the minimum operating hours (service lifetime)and is determined by the lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified inoperational hours and is calculated according to the capacitor’s manufacturer specification. The manufacturer of theelectrolytic capacitors only guarantees a maximum lifetime of up to 15 years (131 400h). Any number exceeding thisvalue is a calculated theoretical lifetime which can be used to compare devices.

Calculated lifetime expectancy

3AC 400V
62 000h78 000h
112 000h
172 000h
221 000h
304 000h

3AC 480V
62 000h
76 000h
109 000h
172 000h
212 000h
288 000h

at 24V, 40A and +40°C
at 24V, 32A and +40°C
at 24V, 20A and +40°C
at 24V, 40A and +25°C
at 24V, 32A and +25°C
at 24V, 20A and +25°C

13. MTBF
MTBF stands for Mean Time Between Failures, which is calculated according to statistical device failures, and indicatesreliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily
represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000 hmeans that statistically one unit will fail every 100 h if 10 000 units are installed in the field. However, it cannot be
determined if the failed unit has been running for 50 000 h or only for 100 h.
For these types of units the MTTF (Mean Time To Failure) value is the same value as the MTBF value.

MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F

3AC 400V
350 000h
628 000h
90 000h
120 000h
28 000h37 000h3AC 480V
345 000h
622 000h
90 000h
119 000h
28 000h36 000hat 24V, 40A and +40°C
at 24V, 40A and +25°C
at 24V, 40A and +40°C; Ground Benign GB40
at 24V, 40A and +25°C; Ground Benign GB25
at 24V, 40A and +40°C; Ground Fixed GF40
at 24V, 40A and +25°C; Ground Fixed GF25

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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14. FUNCTIONAL DIAGRAM
Fig. 14-1 Functional diagram

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

15. TERMINALS AND WIRING
The terminals are IP20 Finger safe constructed and suitable for field and factory wiring.
Input
screw terminals
max. 6mm2
max. 4mm2
AWG 20-10
2.8mm(including ferrules)
7mm
4mm slotted or crosshead No 1
0.8Nm

Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Wire stripping length
Screwdriver
Recommended tightening torqueOutputscrew terminals
max. 16mm2
max. 10mm2
AWG 22-8
5.2mm(including ferrules)
12mm
3.5mm or 5mm slottedor cross-head No 2
2Nm

IO-Link
A-coded M12 malescrew-nut might require
wrench
0.6Nm

Instructions:a) Use appropriate copper cables that are designed for minimum operating temperatures of:+60°C for ambient up to +45°C and+75°C for ambient up to +60°C minimum+90°C for ambient up to +70°C minimum.
b) Follow national installation codes and installation regulations!
c) Ensure that all strands of a stranded wire enter the terminal connection!
d) Do not use the unit without PE connection.
e) Unused terminal compartments should be securely tightened.
f) Ferrules are allowed.
Daisy chaining:
Daisy chaining (jumping from one power supply output to the next) is allowed as long as the average output current
through one terminal pin does not exceed 54A. If the current is higher, use a separate distribution terminal block asshown in Fig. 15-2.
Fig. 15-1 Daisy chaining of outputs

Power
SupplyPower
Supply

+ + -

+ + -

-

Output-OutputFig. 15-2 Using distribution terminals

Load
+

-

Power
SupplyPower
Supply

+ + -

+ + -

-

Output-OutputDistribution
Terminals
Load
+

-

max 54A!

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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16. FRONT SIDE AND USER ELEMENTS
Fig. 16-1 Front sideA

Input Terminals (Screw terminals)
L1, L2, L3 Line input...PE (Protective Earth) input

B

C
D

F

C

D

E

B

E

A

F

Output Terminals(Screw terminals, two pins per pole)+
Positive output–
Negative (return) output
DC-OK LED (green)
On, when the voltage on the output terminals
is >90% of the adjusted output voltage
Overload LED (red)- On, when the voltage on the output
terminals is <90% of the adjusted output
voltage, or in case of a short circuit in the
output.
- Flashing, when the shut-down has been
activated or the unit has switched off due toovertemperature.
- Input voltage is required
IO-Link Communication LED (green/red)- OFF, when IO-Link not powered- Green on, when IO-Link interface powered- Green flashing, when communication active- Red on, when IO-Link warning event
triggered- Red flashing, when notification active
IO-Link Connector M12 A-coded male

Indicators, LEDs

Normal mode
During BonusPower
Overload (Vout < 90%)
Output short circuit
Temperature Shut-down
Active Shut-down input
No input power
No IO-Link power
IO-Link interface powered
IO-Link communication active
IO-Link warning event triggered
IO-Link event / notification activated

Overload LED

DC-OK LED

OFF
OFF
ON
ON
flashing
flashing
OFF

ON
ON
OFF
OFF
OFF
OFF
OFF

IO-Link
Communication LED

OFF
Green ON
Green flashing
Red ONRed flashing

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

17. EMCA detailed EMC report is available on request.The power supply is suitable for applications in industrial environment.
All results assume a three phase operation of the power supply.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)

Surge voltage on input
Surge voltage on output
Conducted disturbance
Mains voltage dips
(Dips on three phases)
Mains voltage dips
(Dips on two phases)

Voltage interruptions
Voltage sags

Powerful transients

According generic standards: EN IEC 61000-6-2
contact discharge
8kV
Criterion A
EN 61000-4-2
air discharge
15kV
Criterion A
EN 61000-4-3
80MHz - 6GHz
10V/m
Criterion A
input lines
EN 61000-4-4
4kV
Criterion A
output lines
2kV
Criterion A
IO-Link signal lines
2kV
Criterion A(coupling clamp)
L1  L2, L2  L3, L1  L3
2kV
Criterion A
EN 61000-4-5
L1 / L2 / L3  PE
4kV
Criterion A+1kV
Criterion A
EN 61000-4-5+ / -  PE
1kV
Criterion A
EN 61000-4-6
0.15-80MHz
10V
Criterion A
0% of 380Vac (0Vac)
0Vac, 20ms
Criterion A,
EN 61000-4-11
0% of 480Vac (0Vac)
0Vac, 20ms
Criterion A
40% of 380Vac (152Vac)
200ms
Criterion A
EN 61000-4-11
40% of 480Vac (192Vac)
200ms
Criterion A
70% of 380Vac (266Vac)
500ms
Criterion A
70% of 480Vac (336Vac)
500ms
Criterion A
EN 61000-4-11
0Vac
5000msCriterion C
SEMI F47
dips on two phases according to section 7.2. of the SEMI F47 standard
1000msCriterion A
80% of 380Vac (304Vac)
500ms
Criterion A
70% of 380Vac (266Vac)
50% of 380Vac (160Vac)
200ms
Criterion A
VDE 0160
over entire load range
1550V, 1.3ms
Criterion A

Criterions:
A: Power supply shows normal operation behavior within the defined limits.
C: Temporary loss of function is possible. Power supply may shut-down and restarts by itself. No damage or hazards for the power supply
will occur.

EMC Emission
Conducted emission
input lines
Conducted emission
output lines

According generic standards: EN IEC 61000-6-4; EN IEC 61000-6-8
EN 55011, EN 55032, FCC Part 15, CISPR 11, CISPR 32
Class Blimits for DC power ports
according EN IEC 61000-6-8 are
fulfilledClass Afulfilled for class A equipment
fulfilled1)

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1

Radiated emission
EN 55011, EN 55032
Harmonic input current
EN 61000-3-2
Voltage fluctuations, flicker EN 61000-3-3This device complies with FCC Part 15 rules.
Operation is subjected to following two conditions: (1) this device may not cause harmful interference, and (2) thisdevice must accept any interference received, including interference that may cause undesired operation.
1)

Tested with constant current loads, non-pulsing

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

The power supply has three converters with three different switching frequencies
included. One is nearly constant. The others are variable.
105kHzresonant converter, nearly constant
1kHz to 135kHz
boost converter, load dependent
40kHz to 210kHz
PFC converter, input voltage and load dependent

Switching Frequencies
Switching frequency 1
Switching frequency 2
Switching frequency 3

18. ENVIRONMENT
Operational temperature1)
Storage temperature
Output derating
Humidity2)
Vibration sinusoidal
Shock
Altitude

Altitude derating
Over-voltage category2)
3)

reduce output power according Fig. 18-1
for storage and transportation
between +55°C and +70°C
IEC 60068-2-30
IEC 60068-2-6
IEC 60068-2-27
without any restrictions
reduce output power or ambient temperature,
see Fig. 18-2
> 2000m, see Fig. 18-2
IEC/UL 61010-2-201 up to 4000m
IEC/UL 61010-2-201 up to 5000m
IEC/UL 61010-2-201 not conductive

60W/1000m or 5°C/1000m
III
II
2

Degree of pollution
1)-25°C to +70°C-40°C to +85°C
20W/°C
5 to 95% r.H.
2-17.8Hz: ±1.6mm; 17.8-500Hz: 1g3)
2 hours / axis
15g 6ms, 10g 11ms3)
3 bumps / direction, 18 bumps in total
0 to 2000m
2000m to 5000m

Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm below theunit. Curves and figures for operation on only 2 legs of a 3-phase system can be found in chapter 26.4.
Do not energize while condensation is present.
Higher levels allowed when using the wall mounting bracket ZM2.WALL

Fig. 18-1 Output current vs. ambient temp.
Al lowed Output Current at 24V

60A

60A

50

50

40

40

30

30

A... Tamb < 55 °C
B... Tamb < 45°C
C... Tamb < 35°C

20

20

10

10
0

Fig. 18-2 Output current vs. altitude
Al lowed Output Current at 24V

0
-25

0

20

40

55 70°C

02000

4000 5000m
Al titude

Ambient Temperature

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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Q-Series

19. PROTECTION FEATURES
Output protection
Output overvoltage protection

Electronically protected against overload, no-load and short-circuits1)
typ. 30Vdc
In case of an internal power supply defect, a redundantcircuit limits the maximum output voltage. The output
max. 32Vdc
shuts down and automatically attempts to restart.
EN/IEC 60529
IP20
Caution: For use in a controlled environment according
to
CSA 22.2 No 107.1-01.
> 5mm
e.g. screws, small partsyes
output shut-down with automatic restart
MOV (Metal Oxide Varistor)
included
not user replaceable

Degree of protection

Penetration protection
Overtemperature protection
Input transient protection
Internal input fuse
1)

In case of a protection event, audible noise may occur.

20. SAFETY FEATURES
The supply voltage for the IO-Link must be powered from a PELV or SELV source or an "Isolated Secondary Circuit" inorder to maintain a SELV or PELV output. Do not connect the IO-Link port to any other equipment except industrial
control equipment.
Input / output separation1)

Class of protection
Isolation resistancePE resistance
Touch current (leakage current)

1)

SELV
IEC/UL 61010-2-201
PELV
IEC/UL 61010-2-201
double or reinforced insulation
I
PE (Protective Earth) connection required> 100MOhm
input to output, 500Vdc< 0.1Ohm
typ. 0.35mA / 0.64mA
3x400Vac, 50Hz, TN-,TT-mains / IT-mains
typ. 0.45mA / 0.91mA
3x480Vac, 60Hz, TN-,TT-mains / IT-mains
max. 0.45mA / 0.78mA
3x440Vac, 50Hz, TN-,TT-mains / IT-mains
max. 0.60mA / 1.20mA
3x528Vac, 60Hz, TN-,TT-mains / IT-mains

double or reinforced insulation

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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Q-Series

21. DIELECTRIC STRENGTH
The output voltage is floating and has no ohmic connection to the ground. Type and factory tests are conducted by
the manufacturer. Field tests may be conducted in the field using the appropriate test equipment which applies thevoltage with a slow ramp (2s up and 2s down). Connect all phase terminals together as well as all output poles before
conducting the test. When testing, set the cut-off current settings to the value in the table below.
Type test

60s

A
2500Vac

B
3000Vac

C
500VacD
500VacFactory test

5s

2500Vac

2500Vac

500Vac

500VacField test

5s

2000Vac

2000Vac

500Vac

500Vac> 10mA> 10mA> 40mA> 1mA

Fig. 21-1 Dielectric strength

Input
L1
L2
L3

Earth

IO-LinkPort

Cut-off current setting
B

A

B*)

C

D
Output+/-To fulfil the PELV requirements according to EN 60204-1 § 6.4.1, werecommend that either the + pole, the – pole or any other part ofthe output circuit shall be connected to the protective earthsystem. This helps to avoid situations in which a load starts
unexpectedly or can not be switched off when unnoticed earth
faults occur.

B*) When testing input to DC-OK ensure that the max. voltage between DC-OK and the output is not exceeded (column D). We recommend
connecting DC-OK pins and the output pins together when performing the test.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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Q-Series

22. APPROVED, FULFILLED OR TESTED STANDARDSIEC 61010-2-201

UL 61010-2-201

SEMI F47

VDMA 24364

CB Scheme Certificate
Electrical Equipment for Measurement, Control andLaboratory Use - Particular requirements for control
equipment
UL Certificate
Listed equipment for category NMTR - Electrical Equipment for
Measurement, Control and Laboratory Use - Particularrequirements for control equipment
Applicable for US and Canada
E-File: E198865
Test Report
Voltage Sag Immunity for Semiconductor Processing
Equipment
Tested for 3AC 400V L-L mains voltages, nominal output
voltage and nominal output load
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364C1-L/W for solvents and water-based paints

23. REGULATORY PRODUCT COMPLIANCE
EU Declaration ofConformity

REACH Regulation (EU)

WEEE Regulation

The CE mark indicates conformance with the- EMC directive- Low-voltage directive- RoHS directive
Manufacturer's Statement
EU regulation regarding the Registration, Evaluation,
Authorisation and Restriction of Chemicals (REACH)
fulfilled.
Manufacturer's Declaration
EU Regulation on Waste Electrical and Electronic Equipment
Registered as business to business (B2B) products.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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QT40.241-IOL
Q-Series

24V, 40A, THREE PHASE INPUT

24. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth

WeightDIN rail
Housing material
Installation Clearances

110mm
124mm
143.5mm
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.
1500g
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Body: aluminium alloy
Cover: zinc-plated steel
See chapter 2

Fig. 24-1 Front viewFig. 24-2 Side view

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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Q-Series

25. ACCESSORIES

25.1. ZM2.WALL - WALL MOUNTING BRACKETThis bracket is used to mount specific
DIMENSION units onto a flat surface without
utilizing a DIN rail.

25.2. UF20.241 - BUFFER MODULE
This buffer unit is a supplementary device for DC 24V power supplies. It delivers
power to bridge typical mains failures or extends the hold-up time after turn-offof the AC power. In times when the power supply provides sufficient voltages, thebuffer unit stores energy in integrated electrolytic capacitors. In case of mains
voltage fault, this energy is released again in a regulated process. One buffer
module can deliver 20A. To buffer the full output current of 40A, two buffer
modules are needed in parallel.
The buffer unit does not require any control
wiring. It can be added in parallel to theload circuit at any given point. Buffer units
can be added in parallel to increase theoutput ampacity or the hold-up time.

AC

Power
SupplyBufferUnit(s)DC

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

Load

+
-

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24V, 40A, THREE PHASE INPUT

Q-Series25.3. YR80.241 - REDUNDANCY MODULEThe YR80.241 is equipped with two input channels (40A each), which are individually
decoupled by utilizing MOSFET technology. The output current can go as high as 80A.
Using MOSFETs instead of diodes reduces the heat generation and the voltage drop between
input and output. The YR80.241 does not require an additional auxiliary voltage and is selfpowered even in case of a short circuit across the output.
Due to the low power losses, the unit is very slender and only requires 46mm width on the
DIN rail.

Fig. 25-1 Typical 1+1 Redundant configuration for 40A with a dual redundancy module
24V
40A
Load

QT40
24-28V 960W
Power Supply

QT40
24-28V 960W
Power Supply

OutputYR80.241
Redundancy
Module24V, 40A

L1 L2 L3 PE

I

I

I

+ +

- -

Input
1

+ -

Input
2

24V, 40A+ -L1 L2 L3 PE

I

I

+ +

- -

I

L1
L2
L3
PE

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

26. APPLICATION NOTES
26.1. REPETITIVE PULSE LOADING
Typically, a load current is not constant and varies over time. This power supply is designed to support loads with ahigher short-term power demand (= BonusPower). The short-term duration is hardware controlled by an output power
manager and is available on a repeated basis. If the BonusPower load lasts longer than the hardware controller allows
it, the output voltage will dip and the next BonusPower is available after the BonusPower recovery time (seechapter 6) has elapsed.
To avoid this, the following rules must be met:a) The power demand of the pulse must be below 150% of the nominal output power.
b) The duration of the pulse power must be shorter than the allowed BonusPower time. (see output section)c)
The average (R.M.S.) output current must be below the specified continuous output current.
If the R.M.S. current is higher, the unit will respond with a thermal shut-down after a period of time. Use themaximum duty cycle curve (Fig. 26-2) to check if the average output current is below the nominal current.
d) The duty cycle must be below 0.5.
Fig. 26-1 Repetitive pulse loads, definitions

PPEAK TPEAK

Fig. 26-2 Max. duty cycle curve

T0

max.
150%
100%

P0

P0
PPEAK
T0
TPEAK

Example:Base load (W)Pulse load (above 100%)
Duration between pulses (s)Pulse duration (s)DutyCycle =
T0 =

Tpeak
Tpeak + T0

Tpeak - (DutyCycle x Tpeak)
DutyCycle

A load is powered continuously with 480W (= 50% of the rated output load). From time to time a peak
power of 1440W (= 150% of the rated output load) is needed for 1 second.
The question is: How often can this pulse be supplied without overloading the power supply?
- Make a vertical line at PPEAK = 150% and a horizontal line where the vertical line crosses the P0 = 50%
curve. Read the max. duty cycle from the duty cycle-axis (= 0.37)- Calculate the required pause (base load) length T0:- Result: The required pause length = 1.7s

T0=

- Max. repetition rate = pulse +pause length = 2.7s

Tpeak - (DutyCycle x Tpeak)
DutyCycle=

1s - (0.37 x 1s)
0.37= 1.7sMore examples for pulse load compatibility:
PPEAK
1440W
1440W
1200W

P0
960W
0W
480W

TPEAK
1s
1s
1s

T0
>25s
>1.3s
> 0.75s

PPEAK
1440W
1440W
1440W

P0
480W
480W
480W

TPEAK
0.1s
1s
3s

T0
>0.16s
>1.6s>4.9s

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

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26.2. PEAK CURRENT CAPABILITY
The power supply can deliver peak currents (up to several milliseconds) which are higher than the specified short term
currents.
This helps to start current demanding loads. Solenoids, contactors and pneumatic modules often have a steady state
coil and a pick-up coil. The inrush current demand of the pick-up coil is several times higher than the steady-state
current and usually exceeds the nominal output current (including the BonusPower). The same situation applies whenstarting a capacitive load.
The peak current capability also ensures the safe operation of subsequent circuit breakers of load circuits. The loadbranches are often individually protected with circuit breakers or fuses. In case of a short or an overload in one branch
circuit, the fuse or circuit breaker need a certain amount of overcurrent to open in a timely manner. This avoids
voltage loss in adjacent circuits.
The extra current (peak current) is supplied by the power converter and the built-in large sized output capacitors of
the power supply. The capacitors get discharged during such an event, which causes a voltage dip on the output. The
following two examples show typical voltage dips:

Fig. 26-3 Peak load with 2x the nominal
current for 50ms, typ.

Fig. 26-4 Peak load with 5x the nominal
current for 5ms, typ.

80Apeak load (resistive) for 50ms
Output voltage dips from 24V to 19V.

200Apeak load (resistive) for 5ms
Output voltage dips from 24V to 17V.

Please note: The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.

Peak current voltage dips

typ.
typ.
typ.

from 24V to 19V
from 24V to 18Vfrom 24V to 17V

at 80A for 50ms, resistive load
at 200A for 2ms, resistive load
at 200A for 5ms, resistive load

26.3. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 30A (U.S.A.) and 32A (IEC). An external protection is only
required if the supplying branch has an ampacity greater than this. Check also local codes and local requirements. In
some countries local regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 6A B- or C-Characteristic breaker should be chosen.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

26.4. USING ONLY 2 LEGS OF A 3-PHASE SYSTEM
No external protection devices are required to protect against a phase-loss failure.
This power supply can also be permanently operated on two legs of a 3-phase system. However, it is not recommended
for this power class since the supplying 3-phase network can become
L1
Power Supply
L2
unbalanced.
L3
PE

The output power must be reduced according to the curves below when
operation on only two legs of a 3-phase system. A long-term exceeding ofthese limits will result in a thermal shut-down of the unit.

AC
L1
L2
open

A use below 340Vac with more than 30A output current can also result in athermal shut-down.

L3

DC

During power-on, some start-up attempts can occur until a permanent output power is available.
EMC performance, hold-up time, losses and output ripple differ from a three phase operation. Therefore, checksuitability of your individual application.
Such use is not included in the UL approval. Additional tests might be necessary when the complete system has to beapproved according to UL 61010-2-201.
The screw of the terminal which remains unused must be securely tightened.
Fig. 26-5
Output current vs. ambient temperature

Fig. 26-6
Hold-up time vs. input voltage

Al lowed Output Current for Use on only Two Legs of a
3-Phase System

Hold-up Ti me for Use on only Two Legs of a Three Phase
Sy stem

40A

50ms

30

40

20

30
20

10
0

10
-25

0

20

40

0

60 70°C

Ambient Temperature

Fig. 26-7
Efficiency vs. output current at 24V

Input Voltage

320

360

400

440

Power Losses for Use on only
Two Legs of a 3-Phase System

96%

60W

2x480Vac95

2x400Vac50402x400Vac94

2x480Vac

30

93

20

Output Current

8

12

16

20

3x480Vac

Fig. 26-8
Losses vs. output current at 24V

Efficiency for Use on only
Two Legs of a 3-Phase System

92

24V, 20A, t yp.
24V, 20A, min.

24

28

32

36

40A

10

Output Current

0

4

8

12 16 20 24 28 32 36 40A

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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24V, 40A, THREE PHASE INPUT

Q-Series

26.5. CHARGING OF BATTERIESThe power supply can be used to charge lead-acid or maintenance free batteries (two 12V batteries in series).
Instructions for charging batteries:a)

Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage

27.8V

27.5V

27.15V

26.8V

Battery temperature

10°C

20°C

30°C

40°C

b)

Use a 50A or 63A circuit breaker (or blocking diode) between the power supply and the battery.

c)Ensure that the output current of the power supply is below the allowed charging current of the battery.

d)Use only matched batteries when putting 12V types in series.

e)

The return current to the power supply (battery discharge current) is typ. 18mA when the power supply isswitched off (except in case a blocking diode is utilized).

26.6. OUTPUT CIRCUIT BREAKERS
Standard miniature circuit breakers (MCB’s or UL1077 circuit breakers) are commonly used for AC-supply systems andmay also be used on DC branches.
MCB’s are designed to protect wires and circuits. If the ampere value and the characteristics of the MCB are adapted to
the wire size that is used, the wiring is considered as thermally safe regardless of whether the MCB opens or not.
To avoid voltage dips and under-voltage situations in adjacent 24V branches which are supplied by the same source, afast (magnetic) tripping of the MCB is desired. A quick shutdown within 10ms is necessary corresponding roughly tothe ride-through time of PLC's. This requires power supplies with high current reserves and large output capacitors.
Furthermore, the impedance of the faulty branch must be sufficiently small in order for the current to actually flow.
The best current reserve in the power supply does not help if Ohm’s law does not permit current flow. The following
table has typical test results showing which B- and C-Characteristic MCBs magnetically trip depending on the wire crosschapter and wire length.
Fig. 26-9 Test circuit

Power Suppl y

DC

MCB

+
Wire l ength

DC S1... Fault simul ation switch

1)

Load

+
S1

-

Maximal wire length1) for a fast (magnetic) tripping:
0.75mm²
1.0mm²1.5mm²2.5mm²
31 m
42 m
62 m
92 m
C-2A
28 m
36 m
51 m
77 m
C-3A
18 m
23 m
36 m
55 m
C-4A
11 m
14 m
21 m
33 m
C-6A
8m
12 m
18 m
27 m
C-8A
7m
10 m
15 m
22 m
C-10A
4m
6m
8m
13 m
C-13A
2m
3m
4m
7m
C-16A
1m
2m
3m
5m
C-20A
23 m
29 m
40 m
64 m
B-6A
13 m
16 m
24 m
38 m
B-10A
11 m
13 m
20 m
32 m
B-13A
8m
12 m
18 m
26 m
B-16A
4m
6m
9m
15 m
B-20A
3m
4m
7m
9m
B-25A
3m
4m
5m
7m
B-32A

Don’t forget to consider twice the distance to the load (or cable length) when calculating the total wire length (+ and – wire).

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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26.7. PARALLEL USE TO INCREASE OUTPUT POWER
Power supplies from the same series (Q-Series) can be paralleled to increase the output power. The output voltage ofall power supplies shall be adjusted to the same value (±100 mV) in “Single Use” mode with the same load conditions
on all units, or the units can be left with the factory settings. After the
Unit Aadjustments, set the unit to “Parallel Use” mode via IO-Link interface inACorder to achieve load sharing.
+If more than three units are connected in parallel, a fuse or circuit breakerwith a rating of 50A or 63A is required on each output. Alternatively, a
diode or redundancy module can also be utilized.

DC+

Unit B

Keep an installation clearance of 15mm (left / right) between two power
supplies and avoid installing the power supplies on top of each other. Do
not use power supplies in parallel in mounting orientations other than thestandard mounting orientation (terminals on the bottom of the unit) or in
any other condition where a derating of the output current is required (e.g.
altitude, above +60°C, …).

AC
DC

+
-

Load

-

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

26.8. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require acertain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two
power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is
automatically able to support the load current without any interruption. Redundant systems for a higher power
demand are usually built in a N+1 method. E.g. five power supplies, each rated for 40A are paralleled to build a 160A
redundant system. For N+1 redundancy the same restrictions apply as for increasing the output power, see also
chapter 26.7.
Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in
the secondary side of the power supply. In such a case, the defective unit becomes a load for the other power supplies
and the output voltage cannot be maintained any more. This can be avoided by utilizing redundancy modules, whichhave decoupling devices (diodes or MOSFETs) included. Further information and wiring configurations can be found inchapter 25.3.
Recommendations for building redundant power systems:a)

Use separate input fuses for each power supply. A separate source for each supply when possible increases thereliability of the redundant system.

b)

Set the devices into “Parallel Use” mode via IO-Link interface, see chapter 8.

c)Monitor the individual power supply units. Therefore, use the IO-Link event of the QT40 power supply.

d)

It is desirable to set the output voltages of all units to the same value or leave it at the factory setting.

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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Q-Series

24V, 40A, THREE PHASE INPUT

26.9. SERIES OPERATIONPower supplies of the same type can be connected in series for higher output voltages. It is possible to connect as many
units in series as needed, providing the sum of the output voltage does not exceed 150Vdc. Voltages with a potential
above 60Vdc are not SELV anymore and can be dangerous. Such voltages
Unit A
must be installed with a protection against touching.
AC
Earthing of the output is required when the sum of the output voltage isabove 60Vdc.

DC

Avoid return voltage (e.g. from a decelerating motor or battery) which isapplied to the output terminals.

+-+

Unit BAC

Keep an installation clearance of 15mm (left / right) between two power
supplies and avoid installing the power supplies on top of each other. Do
not use power supplies in series in mounting orientations other than thestandard mounting orientation (terminals on the bottom of the unit).

DC

+
-

Load

-

Earth
(see notes)

Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.

26.10. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including capacitive and inductive loads.

26.11. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply.
It does not matter whether the power supply is on or off.
The maximum allowed feed-back-voltage is 35Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 6. Feed-back-voltages can be detected and accessed via the
IO-Link interface, as described in chapter 8.

26.12. USE IN A TIGHTLY SEALED ENCLOSURE
When the power supply is installed in a tightly sealed enclosure, the temperature inside the enclosure will be higher
than outside. In such situations, the inside temperature defines the ambient temperature for the power supply.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:

Rittal Typ IP66 Box PK 9522 100, plastic, 254x180x165mm
24V, 32A; (=80%) load is placed outside the box
3x 400Vac+57.5°C (in the middle of the right side of the power supply with a distance of 2cm)
+23.6°C
33.9K

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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26.13. MOUNTING ORIENTATIONSMounting orientations other than all terminals on the bottom require a reduction in continuous output power or alimitation in the maximum allowed ambient temperature. The amount of reduction influences the lifetime expectancyof the power supply. Therefore, two different derating curves for continuous operation can be found below:
Curve A1
Curve A2

Recommended output current.
Max. allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 26-10
Mounting
Orientation A(Standardorientation)

Output Current (A)
A1

40
30

Power
Supply

20
10

INPUT

Fig. 26-11
Mounting
Orientation B(Upside down)

0

OUTPU T

10

20

30
40
50 55
Ambient Temperature (°C)

Output Current (A)
40
30

A2

20

A1

INPUT

OUTPU T

Power
Supply10010Fig. 26-12
Mounting
Orientation C(Table-top
mounting)

20

30
40
50 55
Ambient Temperature (°C)

Output Current (A)
40
30

A2

20

A1

10
0
10

30
40
50 55
Ambient Temperature (°C)

Output Current (A)40

OUTPU T

Power
SupplyINPUT

Fig. 26-13
Mounting
Orientation D(Horizontal cw)

20

30

A2

20

A1

10
0
10

Fig. 26-14
Mounting
Orientation E(Horizontal ccw)

20

40
50 55
30
Ambient Temperature (°C)

Output Current (A)OUTPU T

30

A2

20

A1

INPUT

Power
Supply

40

10
0
10

20

30
40
50 55
Ambient Temperature (°C)

Aug. 2024 / Rev. 1.0 DS-QT40.241-IOL-EN
All parameters are specified at 24V, 40A, 3x400Vac, +25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

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