XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

SEMI-REGULATED POWER SUPPLY
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1. GENERAL DESCRIPTION

Alternative or Replacement for AC Transformer
Three Phase Input – DC Output
DIN-Rail Mountable
Width only 96mm
95.5% Efficiency
125% Peak Power Capability
No Input Inrush Current
Active Input Transient Blocker
Full Power Between -25°C and +60°C
Easy Failure Diagnostics
No Electrolytic Capacitors on Input Side
Cost Effective and Robust
3 Year Warranty

2. SHORT-FORM DATA

Primary use are applications involving supplies tomotors, valves and other load circuits with a highpower consumption, where an accurate output
voltage regulation which is standard on traditionalswitched-mode power supplies is not required.
Furthermore, these switched-mode power supplies
can often replace mains transformers with rectifiers.

DC 72V
none
13.3A
16.7A
Output power
960W
1200W
Output ripple< 3000mVpp< 200mVpp
Input voltage
3AC 400V
3AC 480V
Mains frequency
50-60HzAC Input current
1.65A / phase
1.4A / phase
Power factor
0.93
AC Inrush current
typ. 2A peak
Efficiency
95.5%
Losses
45.2W
Temperature range -25°C to +70°C
Derating
24W/°C
Dimensions
96x124x159mm

3. ORDER NUMBERS

4. MARKINGS

The power supplies in the Dimension X-Series include
a new and innovative concept for generating an
isolated DC voltage from a three-phase mains
system.
A semi-regulated resonant converter enables a very
compact design, maximum efficiency and extremelycompetitive pricing with only a small compromise in
the output voltage regulation, output ripple andhold-up time.
Weighing just 1.4 kg, the device provides 960 wattsof continuous output power and an additional 25%
power reserve for dynamic loads. The light-weight
design along with compact dimensions facilitatestraightforward mounting on DIN-rail.

Power Supply

XT40.721
XT40.722

400V Input
480V Input

Output voltage
Adjustment range
Output current

continuous
for typ. 15s
continuous
for typ. 15s
20Hz-2kHz
2kHz to 20MHz
XT40.721
XT40.722±6%
XT40.721, 3x400V
XT40.722, 3x480V
72V, 13.3A

operational+60 to +70°C
WxHxD

18WM

LISTED
IND. CONT. EQ.

UL 60950-1

UL 508Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

EMC, LVD

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XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

INDEX

PAGE

1. General Description ............................................1
2. Short-form Data ..................................................1
3. Order Numbers....................................................1
4. Markings ..............................................................1
5. AC-Input...............................................................3
6. Input Inrush Current ...........................................4
7. Output .................................................................5
8. Hold-up Time.......................................................6
9. Efficiency and Power Losses................................7
10. Functional Diagram.............................................8
11. Front Side and User Elements.............................8
12. Terminals and Wiring..........................................913. Reliability .............................................................9
14. EMC....................................................................10
15. Environment ......................................................11
16. Protection Features ...........................................12
17. Safety .................................................................12
18. Dielectric Strength ............................................12
19. Approvals...........................................................13

INDEX

PAGE

20. Fulfilled Standards............................................ 13
21. Used Substances ............................................... 13
22. Physical Dimensions and Weight ..................... 14
23. Installation and Operation Instructions .......... 14
24. Comparison between the XT40, a Transformer
and a Traditional Switched-mode Power Supply .. 15
25. Application Notes............................................. 16
25.1. Periodical Peak Power Capability .......... 16
25.2. Charging of Batteries ............................. 16
25.3. Output Circuit Breakers ......................... 16
25.4. External Input Protection....................... 16
25.5. Back-feeding Loads ................................ 1725.6. Parallel Use to Increase Output Power . 17
25.7. Parallel Use for Redundancy.................. 1725.8. Series Operation..................................... 1725.9. Inductive and Capacitive Loads ............. 1825.10. Loss of One Input Phase......................... 18
25.11. Use in a Tightly Sealed Enclosure .......... 18
25.12. Mounting Orientations .......................... 19

INTENDED USE
The power supply shall only be installed and put into operation by qualified personnel.
This power supply is designed for installation in an enclosure and is intended for the general use, such as in industrial
control, office, communication, and instrumentation equipment. Do not use this device in aircraft, trains and nuclear
equipment, where malfunctioning of the power supply may cause severe personal injury or threaten human life.

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.

3AC 400V

A figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ±15%) included. 3AC means three phase input.
E.g.: DC 12V describes a 12V battery disregarding whether it is charged (13.7V) or
discharged (10V)As long as otherwise stated, 3AC 400V parameters are valid at 50Hz and 3AC 480V
parameters are valid at 60Hz mains frequency.

3x 400Vac

A figure with the unit (Vac) at the end is a value which is used during testing without any
additional tolerances included. 3x 400Vac means a three phase input.

DISCLAIMER
The information presented in this document is believed to be accurate and reliable and may change without notice.

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

2/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

5. AC-INPUT
AC input
Mains arrangement
AC input range

nom.
min.
min.
max.

Input frequency
Turn-on voltage
Shut-down voltage
Input current
Power factor **)Turn-on overshootStart-up delay ***)
Rise time
*)
**)
***)

nom.
typ.
typ.
nom.
typ.
typ.
typ.
typ.
typ.

XT40.721
XT40.722
3AC 400V
3AC 480V
TN-, TT- or IT-Mains
3x 360-440Vac 3x 432-528Vac
3x 300-460Vac 3x 360-552Vac*)*)
3x 475Vac
3x 565Vac

50 – 60Hz
3x 325Vac
3x 295Vac
1.65A
0.93
1.4V
400ms
40ms
70ms

50 – 60Hz
3x 390Vac
3x 355Vac
1.4A
0.93
1.4V
350ms
40ms
70ms

consult factory if one phase is earthed
fully regulated output (±2%), Pout > 48W
permanently allowed,
see Fig. 5-1 for output voltage regulation
Absolute maximum input voltage with nodamage to the power supply. Output
might be off at this level.
±6%
see Fig. 5-2
see Fig. 5-2
at 13.3A, symmetrical input, see Fig. 5-4
at 13.3A, symmetrical input, see Fig. 5-5
see Fig. 5-3
over the entire load range, see Fig. 5-3
0mF, 13.3A, see Fig. 5-3
13mF, 13.3A, see Fig. 5-3

A minimum voltage of 3x340Vac (XT40.721) or 3x408Vac (XT40.722) is required to turn the power supply on.
The power factor is the ratio of the true (or real) power to the apparent power in an AC circuit.
The start-up delay for mains voltage interruptions up to 350ms is zero. In such cases, the power supply will immediately
generate the output voltage once the mains voltage interruption is over.

Fig. 5-1 Output voltage vs. input voltage and input current

Input Voltage Range
Changes of the input voltage will be fully
regulated within certain limits. The
output voltage will only start to change
proportionally to the input voltage withextreme under or over-voltages. The
yellow LED reports an input voltage
problem if exceeded by a window of±15%. The maximum increase of theoutput voltage is limited to the 91.1V
OVP level. This level will be kept
regulated for 2s before the power supply
will shut down and reports “Shut-down”
by the red LED.

VOUT
POUT = 0W

84V
78V

POUT > 48W (>5%)

72V
66V

VIN

60V

XT40.721: 300 320 340 360 380 400 420 440 460 480Vac
XT40.722: 360 384 408 432 456 480 504 528 552 576Vac

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

3/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

Fig. 5-2 Input voltage range

IntputVoltageTurn-onShut-down

fully regulated
range

VIN

400V Version: 3x 360Vac
480V Version: 3x 432Vac

Start-updelay

3x 440Vac
3x 528Vac

Fig. 5-4 Input current vs. output load

1.8A

1.2

4
XT

0.9
0.6
0.3

2
0. 7

1(

3

Power Factor, typ.

V
00
x4

.72
40
XT

3x
2(

1.0

)

0.95

)
0V
48

0.9
0.85
0.8
0.75

Output Current

Output Current

0.70

0
2

6

4

8

10

Rise
Time

Fig. 5-5 Power factor vs. output load

Input Current per Phase, typ.

1.5

- 5%

OutputVoltage

Overshoot

POUT

Fig. 5-3 Turn-on behavior definitions12

14 16A

2

4

6

8

10

12

14 16A

6. INPUT INRUSH CURRENT
There is virtually no input inrush current surge as there are no electrolytic bulk-capacitors utilized on the input side of
the power supply.
The charging current into the EMI suppression capacitors is disregarded for the first millisecond after switch-on.

Inrush current
Inrush energy
Inrush delay

max.
max.
typ.

XT40.721
4Apeak
5A2s
400ms

XT40.722
4Apeak
5A2s
350ms-25°C to +70°C, see Fig. 6-1-25°C to +70°C, see Fig. 6-1
see Fig. 6-1

Fig. 6-1 Input inrush current, typical behavior

Input Current

A

Input Voltage
Output Voltage

A:

Inrush delay

XT40.721:
Input:
Output:Ambient:

3x400Vac, only one phase shown
72V, 13.3A
25°C

Upper curve:
Input current 2A / DIV
Medium curve: Input voltage 500V / DIV(measured between L and N)
Lower curve:
Output voltage 60V / DIVTime basis:
100ms / DIVJan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

4/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

7. OUTPUT
Output voltage
Output voltage adjustment range
Output current

nom.

Short-circuit current

typ.

Output powernom.

Line regulation
Load regulation

max.
max.
max.
max.
max.
typ.

Ripple and noise voltage *)Output capacitance

72V
none
13.3A
16.7A
58A

nom.

The output voltage is fixed. No adjustment possible
continuous, see Fig. 7-1
up to 15s with full output voltage, see Fig. 7-1
load impedance 75mOhm, see Fig. 7-1
Note: The short-circuit current is available for 0.1s
Continuous
up to 15s
see Fig. 5-1
static value, 0A Æ 13.3A Æ 0A
static value, 1.5A Æ 13.3A Æ 1.5A
20Hz-2kHz, 50Ohm
2kHz to 20MHz, 50Ohm

960W
1200W
±2%
2400mV
150mV
3000mVpp
200mVpp
4 050µF*) The ripple and noise voltage mostly consist of a mains ripple with 300Hz (50Hz mains) or 360Hz (60Hz mains). The ripple andnoise voltage can be reduced by the utilization of external capacitors.

The power supply is also designed to support loads with a higher short-term current and power requirement. The
short-term duration is firmware controlled by an output power manager. If the nominal output power is exceeded fora certain period of time which is defined in the zone A, B and C, the power supply responds with an automatic shutdown. Pressing the reset button or cycling the input power (10s off time is required) initiates an attempt to restart. If
the fault has been cleared the device will operate normally.
The short term power can be used periodically. See chapter 25.1 for further information.
Fig. 7-1 Output voltage vs. output current, typ.

A
15s

VOUT

C
0.1s

B
5s

72V

XT40.721
3x 340V
3x 400V
3x 460V

36V

05

10 26.6 33.3 20

53.3 30

35

40

45

50

55

XT40.722
3x 408V
3x 480V
3x 552V

60

65A

IOUT

Zone A: 25% extra output power for typ. 15s
Zone B: 100% higher output current for typ. 5s
Zone C: Quick-acting shut-down after typ. 0.1s

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

5/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

8. HOLD-UP TIME
Hold-up Time

Hold-up Time

typ.
typ.
typ.
typ.
min.
min.
min.
min.

XT40.721
3.6ms
3.2ms
7.2ms
6.4ms
2.9ms
2.6ms
5.8ms
5.2ms

The energy is stored in the output capacitor. As
soon as the input is turned off, the output
capacitor will be discharged and the voltage will
dissipate according to the curves in Fig. 8-2. The
lighter the load, the longer the hold-up time. Halfthe load means twice the hold-up time.
The hold-up time depends on the load
characteristic. The curves below show the hold-up
time for a load with a resistive and a constant
power characteristic.
The hold-up time is defined as the period of time
when the input is turned off and until the output
voltage falls below 72V –15% (61.2V). This value isdefined in the IEC61131-2 as the lower limit for the
supplying voltage.

XT40.722
3.6ms
3.2ms
7.2ms
6.4ms
2.9ms
2.6ms
5.8ms
5.2ms

13.3A, resistive load, see Fig. 8-2
13.3A, constant power load, see Fig. 8-2
6.7A, resistive load
6.7A, constant power load
13.3A, resistive load, see Fig. 8-2
13.3A, constant power load, see Fig. 8-2
6.7A, resistive load
6.7A, constant power load

Fig. 8-1 Hold-up time, definitions

Zero Transition
IntputVoltage

OutputVoltage

HoldupTime-15%

Fig. 8-2 Hold-up time vs. input voltage

VOUT

13.3A, constant power load, min.

72V

13.3A, constant power load, typ.

66V

13.3A, resistive load, min.

61.2V

13.3A, resistive load, typ.

54V
48V
42V

T

36V
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5

10 10.5 11ms

Note: At no load, the hold-up time can be up to one minute. The green DC-ok LED is on during this time.

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

6/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

9. EFFICIENCY AND POWER LOSSES
Efficiency
Power losses

typ.
typ.
typ.

XT40.721
95.5%
45.2W
18.2W

XT40.722
95.5%
45.2W
18.2W

Fig. 9-1 Efficiency vs. output current

13.3A
13.3A
0A

Fig. 9-2 Losses vs. output current

Efficiency

Power Losses

96%
95
94
93
92
91
90
89
88
1.5

50W
40
30
20
10
Output Current

3

4.5

6

7.5

9

10.5 12 13.5A

Fig. 9-3 Efficiency vs. input voltage, 72V, 13.3A

95.8%

Efficiency

0 1.5 3 4.5 6 7.5 9 10.5 12 13.5A

Fig. 9-4 Losses vs. input voltage, 72V, 13.3A

52W

XT40.721

95.6

Output Current

0

XT40.722

50

95.4

48

95.2

46

95.0

44

94.8

42
Input Voltage

94.6
350

400

450

Power Losses

XT40.721

Input Voltage

40

500 3x550Vac

XT40.722

350

400

450

500 3x550Vac

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

10. FUNCTIONAL DIAGRAM
Fig. 10-1 Functional diagram

L1
L2
L3

Input
Filter
Input
Rectifier

Input
Voltage
MonitorActiveTransient
Blocker

Semiregulated
Power
Converter

OutputFilterTemp.
Shutdown

OverVoltage
Protection

OutputVoltage
Monitor

+
-

DC-ok
LED
Warning
LED

OutputPower
Manager

Shut-down
LED
Reset

11. FRONT SIDE AND USER ELEMENTS
Fig. 11-1 Front side of XT40.721

Output Terminals
Large screw terminal

DC-ok LED (green)
Indicates a normal operation. The LED is on
if the output voltage is higher than 64.8V.

+ Positive output- Negative (return)outputWarning LED (yellow)- A steady-state light indicates an output
current higher than the nominal current
and that the internal shutdown timer isrunning.

See chapter 12“Terminals andWiring” to choose
appropriate wire size.

-

A double flash indicates a phase-loss or
too low / too high input voltage.
(XT40.721: < 3x333Vac or > 3x467Vac
XT40.722: < 3x400Vac or > 3x560Vac)-

A fast flash warns of an impending
temperature shut-down. A shut-down
can be expected within 10 minutes, if
the ambient temperature or the load
current stays constant.

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

Shut-down LED (red) and reset button
The red LED flashes when the device has
shut down. Pressing the reset button or
cycling the input power (10s required)initiates a restart. If the fault has beencleared the device will operate normally.

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

8/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

12. TERMINALS AND WIRING
Use appropriate copper cables that are designed for a minimum operating temperatures of 60°C (for ambient up to45°C) and 75°C (for ambient up to 60°C). Follow national installation codes and regulations! Ensure that all strands ofa stranded wire enter the terminal connection! Do not use the power supply without PE (Ground) connection! Up totwo stranded wires with the same cross section are permitted in one connection point (except PE wire). Ferrules areallowed, but not required.
Input
Screw terminal
0.5-6mm2
0.5-4mm220-10 AWG
7mm / 0.26inch
0.8Nm / 7lb.inch

Type
Solid wire
Stranded wire
American wire gauge
Wire stripping length
Recommended tightening torqueOutputScrew terminal
0.5-16mm2
0.5-10mm222-8 AWG
12mm / 0.5inch
1.2Nm / 10.6lb.inch

13. RELIABILITY

Lifetime expectancy

MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F

min.
min.
min.

t.b.d.
t.b.d.
t.b.d.
539 000h
979 000h
216 000h
296 000h

40°C, 13.3A
40°C, 6.7A
25°C, 13.3A
40°C, 13.3A
25°C, 13.3A
40°C, 13.3A, Ground Benign GB40
25°C, 13.3A, Ground Benign GB25

The Lifetime expectancy shown in the table above indicates the operating hours (service life) and is determined by
the lifetime expectancy of the built-in electrolytic capacitors.
Lifetime expectancy is specified in operational hours and is calculated according to the capacitor’s manufacturer
specification. The prediction model allows a calculation of up to 15 years from date of shipment.
MTBF stands for Mean Time Between Failure, 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.

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

14. EMCThe power supply is suitable for applications in industrial environments as well as in residential, commercial and lightindustry environments without any restrictions. The CE mark is in conformance with EMC guideline 89/336/EEC and93/68/EEC and the low-voltage directive (LVD) 73/23/EWG. A detailed EMC report is available on request.
EMC Immunity
Electrostatic discharge
Electromagnetic RF field
Fast transients (Burst)
Surge voltage on input
Surge voltage on output
Conducted disturbance
Mains voltage dips

Powerful transients

EN 61000-6-1 and EN 61000-6-2
EN 61000-4-2
Contact discharge
Air discharge
EN 61000-4-3
80MHz-1GHz
EN 61000-4-4
Input lines
Output lines
EN 61000-4-5
L1 Æ L2, L2 Æ L3, L1 Æ L3
L1 / L2 / L3 Æ PE
EN 61000-4-5+Æ+ / - Æ PE
EN 61000-4-6
0.15-80MHz
EN 61000-4-11
0% of 400Vac
40% of 400Vac
70% of 100Vac
0% of 480Vac
40% of 480Vac
70% of 480Vac
VDE 0160
over entire load range

Generic standards
8kV
Criterion A
15kV
Criterion A
10V/m
Criterion A
4kV
Criterion A
2kV
Criterion A
2kV
Criterion A
4kV
Criterion A
500V
Criterion A
500V
Criterion A
10V
Criterion A
20ms
Criterion B
200ms
Criterion C
500ms
Criterion C
20ms
Criterion B
200ms
Criterion C
500ms
Criterion C
1300V, 1.3ms
Criterion D

Criteria:
A: Power supply shows normal operation behavior within the defined limits.
B: During the mains voltage dip, the output voltage will decrease according to curves in the section “Hold-up Time”. The unit works in normal mode
once the voltage dip is over.
C: Temporary loss of function is possible. Power supply might shut-down and restarts by itself. No damages or hazards for the power supply will occur.
D: The input transient blocker opens and the main converter is without input power during such transients. The output voltage decreases similar as
described in the hold-up time section during such an event.

EN 61000-6-3 and EN 61000-6-4
Generic standards
EN 55011, EN 55022, FCC Part 15, CISPR 11, CISPR 22 Class B, input lines
EN 55022
Class B, output lines
Radiated emission
EN 55011, EN 55022
Class B
Harmonic input current
EN 61000-3-2
Fulfilled, active PFC
Voltage fluctuations, flicker EN 61000-3-3
Fulfilled
This device complies with FCC Part 15 rules.
Operation is subjected to the 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.
EMC Emission
Conducted emission

Switching Frequency
Switching frequency

36kHz

nearly constantJan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

10/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

15. ENVIRONMENT
Operational temperature
Output de-rating
Storage temperature
Humidity-25°C to +70°C (-13°F to 158°F)
24W/°C-40 to +85°C (-40°F to 185°F)
5 to 95% r.H.
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
2 3
0.5m (s )2 hours / axis
15g 6ms, 10g 11ms
3 bumps / direction, 18 bumps in total
0 to 6000m (0 to 20 000ft)

Vibration sinusoidal
Vibration random
Shock
AltitudeOutput de-rating (for altitude)
Over-voltage category

60W/1000m or 5°C/1000m
III
II
2

Degree of pollution

Fig. 15-1 Output current vs. ambient temp.,

reduce output power above +60°C
60-70°C (140°F to 158°F), see Fig. 15-1
storage and transportation
no condensation allowed
IEC 60068-2-6
IEC 60068-2-64
IEC 60068-2-27
Reduce output power or ambient
temperature above 2000m sea level.
above 2000m, see Fig. 15-2
EN 50178, altitudes up to 2000m
Altitudes from 2000m to 6000m
EN 50178, non conductive

Fig. 15-2 Output current vs. altitude

AllowedOutput Current

Allowed Output
Current

13.3A

13.3A

10

10

6.7

6.7

3.3

3.3

0
-25

Ambient Temperature

0

20

40

C
B
A

A... Tamb < 60°C
B... Tamb < 50°C
C... Tamb < 40°C

Altitude0
60 70°C

0

2000

4000

6000m

The ambient temperature is defined 2cm below the unit.

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

11/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

16. PROTECTION FEATURES
Output protection
Output over-voltage protection

Electronically protected against overload, no load and short circuits *)max. 91.1Vdc
In case of an internal power supply failure, a redundantcircuit limits the maximum output voltage. The output
shuts-down and automatically attempts to restart.
typ. 3x 470Vac
XT40.721
typ. 3x 560Vac
XT40.722
IP 20
EN/IEC 60529> 3.5mme.g. screws, small partsyes
output shut-down, reset required
MOV (Metal Oxide Varistor) and active transient blocker
not included
See section 25.4

Input overvoltage shut-down
Degree of protection
Penetration protection
Over-temperature protection
Input transient protection
Internal input fuse*) An audible noise may be heard during a no load, overload or short circuit event.

17. SAFETY
Input / output separation

Double or reinforced insulated. Voltages with a potential above 60Vdc are nolonger rated SELV or PELV and can be hazardous in some situations. Such voltages
must be installed with a protection to make the output voltage touch-safe.
I
PE (Protective Earth) connection required> 5MOhm
input to output, 500Vdc< 0.1Ohm
between housing and PE terminal
typ. 0.30mA
XT40.721: 3x400V, 50Hz, TN mains< 0.35mA
XT40.721: 3x440V, 50Hz, TN mains
typ. 0.40mA
XT40.722: 3x480V, 60Hz, TN mains< 0.45mA
XT40.722: 3x524V, 60Hz, TN mains

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

18. DIELECTRIC STRENGTH
Fig. 18-1 Dielectric strength

Type test
Input
L1
L2
L3

B

A
Earth

Output
+

C

-

60s

A
2500Vac

B
3000Vac

C
500VacFactory test

5s

2500Vac

2500Vac

500VacField test

5s

2000Vac

2000Vac

500VacType tests and factory tests:
Conducted by the manufacturer. Do not repeat these test in
the field!
Rules for field test:
Use appropriate test equipment which applies the voltage
with a slow ramp! Connect L1, L2 and L3 together as well as
all output poles.

The output voltage is floating and has no ohmic connection to ground. Grounding of output allowed.
To fulfill the PELV requirements according to EN60204-1 paragraph 6.4.1, PULS recommend that either the + pole orthe – pole shall be connected to the protective earth system. This helps to avoid situations in which a load starts
unexpectedly or cannot be switched off when an unnoticed ground fault occurs.
Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

12/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

19. APPROVALS
IEC 60950-1

IECEE

CB Scheme,
Information Technology Equipment

CB SCHEMEUL 50818WM

LISTED

LISTED for Industrial Control Equipment, E198865

IND. CONT. EQ.

RECOGNIZED E137006 recognized for the use in U.S.A. (UL 609501) and Canada (C22.2 No. 60950)
Information Technology Equipment, Level 5

UL 60950-1

20. FULFILLED STANDARDSEN 61558-2-17

Safety of Power Transformers

EN/IEC 60204-1

Safety of Electrical Equipment of Machines

EN/IEC 61131-2

Programmable Controllers

EN 50178, IEC 62103

Electronic Equipment for Use in Power Installations

21. USED SUBSTANCESThe unit does not release any silicone and is suitable for the use in paint shops.
Electrolytic capacitors included in this unit do not use electrolytes such as Quaternary Ammonium Salt Systems.
Plastic housings and other molded plastic materials are free of halogens.
The materials used in our production process do not include the following toxic chemicals:
Polychlorinated Biphenyl (PCB), Pentachlorophenol (PCP), Polychlorinated naphthalene (PCN), PolybrominatedBiphenyl (PBB), Polybrominated Biphenyl Oxide (PBO), Polybrominated Diphenyl Ether (PBDE), PolychlorinatedDiphenyl Ether (PCDE), Polybrominated Diphenyl Oxide (PBDO), Cadmium, Asbestos, Mercury, Silica

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

13/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

22. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN-Rail

1400g / 3.09lb
Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN-rail height must be added to the depth (157mm) to calculate the total required
installation depth.
CAD files with mechanical data can be downloaded at www.pulspower.com
Fig. 22-1 Front viewFig. 22-2 Side view

23. INSTALLATION AND OPERATION INSTRUCTIONSMounting and installation:
Output terminal must be located on top and input terminal on the bottom. For other orientations see section 25.12.
An appropriate electrical and fire end-product enclosure needs to be considered in the end use application.
Cooling:
Convection cooled, no forced air cooling required. Do not block ventilation grill by more than 30%!
Installation clearances:
40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended when loaded permanently
with full power. If the adjacent device is a heat source, 15mm clearance are recommended.
Risk of electrical shock, fire, personal injury or death!
Do not use the unit without proper earth connection (Protective Earth). Use the pin on the terminal block for earth
connection and not one of the screws on the housing.
Turn power off before working on the power supply. Protect against inadvertent re-powering.
Make sure the wiring is correct by following all local and national codes.
Do not open, modify or repair the unit.
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
Service parts:
The unit does not contain any field replaceable parts. If damage or malfunctioning should occur, immediately turnpower off and send the unit back to the factory for inspection!
Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

14/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

24. COMPARISON BETWEEN THE XT40, A TRANSFORMER AND A TRADITIONALSWITCHED-MODE POWER SUPPLY

Input voltage range
Inrush current surge
Hold-up time
Phase-loss operation
Efficiency
Output voltage regulation
Output adjustment range
Ripple & noise voltage
Error diagnostics
Harmonic distortion (PFC)
EMC
Ease of installation
Size
Weight

XT40 Semiregulated power
supplyTraditionalswitched-mode
power supply

Transformer
power supply

+
++
+++
+
++
+
++
++
+++
+++

++
+
+
+
++
++
++
++
++
+
++
++
++
+

+
-

+++…very, very good++…very good+…good-…poorJan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

15/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

25. APPLICATION NOTES
25.1. PERIODICAL PEAK POWER CAPABILITY
Fig. 25-Periodical peak power compatibility.

The short term power can be usedperiodically.
The duration of the peak power (TP)must be shorter than 15s.
The time between two peak power
pulses must be three times longer thanthe duration of the preceding pulse
length.

POUT
PNOM

T
TP

> 3x TP

125%
100%

t

25.2. CHARGING OF BATTERIESThe power supply shall not be used to charge batteries.

25.3. OUTPUT CIRCUIT BREAKERS
Consult PULS. Please note that standard circuit breaker are usually rated to maximum 60Vdc.

25.4. EXTERNAL INPUT PROTECTION
The power supply has no internal input fuses included. The unit is tested and approved for branch circuits up to 16A(U.S.A 15A). External protection is only required if the supplying branch has an ampacity greater than this. In somecountries local regulations might apply so check all local codes and requirements. If an external fuse is necessary or
utilized, minimum requirements need to be considered to avoid nuisance tripping of the fuse.

Ampacity

max.
min.

B-Characteristic
20A
6A

C-Characteristic
20A
3A

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

16/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

25.5. 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 adverse effects when a load feeds back voltage to the power supply.
It does not matter, whether the power supply is on or off.
If the power supply is fully loaded after a return-feeding event, the output voltage can dip to 21V for approx 20ms.
The maximum allowed feed back voltage is 87.9Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 7.

25.6. PARALLEL USE TO INCREASE OUTPUT POWER
The XT40 Series of power supplies shall not be paralleled to increase the output power.

25.7. PARALLEL USE FOR REDUNDANCYPower supplies can be paralleled for a 1+1 redundancy to gain a higher system availability and reliability. Redundant
systems require a certain amount of extra power to support the load in case one power supply unit fails. The simplest
way is to put two X-Series power supplies in parallel which 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.
Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit on
the secondary side of the power supply. In such a condition, the shorted unit becomes a load for the other power
supplies and the output voltage can not be maintained. This can be avoided by utilizing decoupling diodes.
Recommendations for building redundant power systems:a) Use separate input fuses for each power supply.
b) Monitor the individual power supply units.

25.8. SERIES OPERATION
The power supplies of the X-Series can be put in series to increase the output voltage.
Fig. 25-1 Schematic for series operation

Unit AAC
DC++

Unit B

Load

AC
DC

+
-

Earth
(see notes)

Installation notes for use in series:a) It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed
150Vdc.
b) Voltages with a potential above 60Vdc are no longer rated SELV
and can be hazardous in some situations. Such voltages must be
installed with a protection to make the unit touch-safe.
c)
For serial operation use power supplies of the same type.
d) Earthing of the output is required when the sum of the output
voltage is above 60Vdc.
e) Keep an installation clearance of 15mm (left/right) between two
power supplies and avoid installing the power supplies on top ofeach other.
Note: Avoid return voltage (e.g. from a decelerating motor orbattery) which is applied to the output terminals.

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

17/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

25.9. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including inductive loads or capacitive loads with a capacity of up to
50mF.

25.10. LOSS OF ONE INPUT PHASEThe unit protects itself against a loss of one input phase and does not require an external protection device.
A phase-loss operation is possible for output currents below 2.7A. Above this level, the yellow LED indicates animpending shut-down. If the missing phase does not recover, the unit switches off after 3.5s. Pressing the reset
button or cycling the input power (10s required) initiates a restart.
Please note that the input current and the output ripple are higher during the time when one phase is missing.

25.11. 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. The inside temperature defines the ambient temperature for the power supply.
Results from such an installation:
Power supply is placed in the middle of the box, no other heat producing equipment inside the box
Enclosure:
Load:
Input:
Temperature inside the box:
Temperature outside the box:
Temperature rise:

Rittal Typ IP66 Box PK 9519 100, plastic, 180x180x165mm
72V, 10.6A (=80% of the rated current); load is placed outside the box
3x400Vac
54.9°C (in the middle of the right side of the power supply with a distance of 2cm)
25.7°C
29.7K

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

18/19

XT40.721, XT40.722
72V, 13A, THREE-PHASE INPUT– X-Series

25.12. MOUNTING ORIENTATIONSMounting orientations other than input terminals on the bottom and output on the top require a reduction incontinuous output power or a limitation in the max. allowed ambient temperature. The amount of reduction defines
the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous operation canbe found below:
Curve A1
Curve A2

Recommended output current to achieve a minimum lifetime expectancy of 50 000h at 40°C ambient.
Max allowed output current for a safe operation (results approx. in half the lifetime expectancy of A1).

Fig. 25-2
Mounting
Orientation A
Standard
Orientation

Output Current
OUTPUT

13.3A

Power
Supply

6.7

A1

10

3.3
INPUT

Ambient Temperature

010Fig. 25-3
Mounting
Orientation B(Upside down)

20

30

40

50

60°C

Output Current

13.3A
10

A2

6.7

A1

INPUT

Power
Supply3.3
Ambient Temperature

OUTPUT

010

Fig. 25-4
Mounting
Orientation C(Table-top
mounting)

20

30

40

50

60°C

Output Current

13.3A
10

A2
A1

6.7
3.3

Ambient Temperature

0
10

40

50

60°C

Output Current

OUTPUT

Power
Supply

10

A2

6.7

A1

3.3
Ambient Temperature

0
10

20

30

40

50

60°C

Output Current

10
INPUT

Power
Supply13.3A
OUTPUT

Fig. 25-6
Mounting
Orientation E(Horizontal ccw)

30

13.3A
INPUT

Fig. 25-5
Mounting
Orientation D(Horizontal cw)

20

A2
A1

6.7
3.3

Ambient Temperature

0
10

20

30

40

50

60°C

Jan. 2007 / Rev. 1.0 DS-XT40.72x-EN All parameters are specified at 72V 13.3A, 3x400Vac (XT40.721) or 3x480Vac (XT40.722),
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

19/19