PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

PROTECTION MODULE
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One input and four current controlled outputs
NEC Class 2 compliant outputs
Ensures sufficient supply voltage for critical loads even in theevent of a fault
Protects small cable sizes against overload
Hassle-free turn-on of loads with large input capacitors
Wide temperature range between -25°C and +70°C
On/Off function of outputs
Compact design, width only 45mm
Remote monitoring and control functions
3 year warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThis protection module fulfills two basic functions. First it distributes
the current of a large (non NEC Class 2) power source to four NEC
CLASS 2 output channels and therefore allows for a simpler wiring
method and easier approval process of the entire machine. The
second function is to permit only so much current on the outputs thatthe input voltage of this unit (which corresponds to the output voltageof the power supply) does not fall below 21V.

Input voltage
Input voltage range
Input current
Number of outputs
Output currents

This ensures a safe and an uninterrupted supply voltage for sensitiveequipments, such as PLCs, controls or sensors, when they areconnected directly to the same power supply as the PISA module. Less
critical loads that
DC24V
Non NECCLASS2 Loadare not affected toPower
SupplyPISA Protection Module
shortvoltage
A1
NECCLASS2 Circuit 1
interruptions or
NECCLASS2 Circuit 2
A2
that could even be
A3
NECCLASS2 Circuit 3
A4
NECCLASS2 Circuit 4
the cause of a
Safeguard
fault on the 24V
power supply are connected to one of the four NEC CLASS 2 output
channels of the PISA module.

ORDER NUMBERS

Input voltage
protection levels
Temperature range
Type of current
limitation
Dimensions

DC 24V18 - 30V
typ. 43mA
44x 3.7A at 24V
4x 3.2A at 28V
typ. 21.4V

At no load

-25°C to +70°C
Operational-40°C to +85°C
Storage
Active current limitation followed by a
shutdown
45x75x91mm *)WxHxD*) Add 13mm in depth for signal connector.

MAIN APPROVALS
For details and a the complete approval list, see chapter 21.

Protection
modulePISA11.CLASS2

4x NEC CLASS 2
outputs
UL 508

IEC 61010-2-201

UL 2367

ATEX

MarineMarineJan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

INDEX
Page
1. Intended Use ................................................................ 3
2. Product Description...................................................... 3
3. Installation Instructions ................................................ 4
4. Input ............................................................................. 6
5. Outputs ........................................................................ 6
6. Current Limitation and Shutdown Behavior ................. 7
7. Connecting Capacitive Loads to the Outputs ............... 9
8. Output-OK Relay Contact ........................................... 10
9. ON/OFF and Reset Signal Input .................................. 10
10. Synchronization of Multiple PISA Modules ................ 10
11. Functional Diagram .................................................... 11
12. Back-feeding Loads..................................................... 11
13. Power Losses .............................................................. 12
14. Lifetime Expectancy and MTBF .................................. 12Page
15. Front Side and User Elements .................................... 13
16. Terminals and Wiring ................................................. 14
17. EMC............................................................................ 15
18. Environment .............................................................. 16
19. Protection Features ................................................... 17
20. Dielectric Strength ..................................................... 17
21. Approved, Fulfilled or Tested Standards .................... 18
22. Regulatory Product Compliance ................................ 19
23. Read-out of the Software Revision Level ................... 20
24. Physical Dimensions and Weight ............................... 21
25. Accessory ................................................................... 21
25.1. ZM3.WALL Wall Mounting Bracket ................ 21

The information presented in this document is believed to be accurate and reliable and may change without notice.
The housing is patent by PULS (US patent No US D442,923S).
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher (PULS GmbH). This
also applies to all kinds of electronic publishing.

TERMINOLOGY AND ABREVIATIONS
DC 24VA figure displayed with the AC or DC before the value represents a nominal voltage with standard tolerances(usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)24Vdc

A figure with the unit (Vdc) at the end is a momentary figure without any additional tolerances included.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

1. INTENDED USEThis device 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 protection module in equipment, where malfunction may cause severe personal injury or threaten human life.
This device is designed for use in hazardous, non-hazardous, ordinary or unclassified locations.

2. PRODUCT DESCRIPTIONThis protection module fulfills two basic functions. First it distributes the current of a large power source to four NEC CLASS 2 output
channels and therefore allows for a simpler wiring method and easier approval process of the entire machine. The second function is to permit
only so much current on the outputs that the input voltage of this unit (which corresponds to the output voltage of the power supply)
does not fall below 21V. This ensures a reliable supply voltage for sensitive equipments, such as PLCs, controls or sensors, when they areconnected directly to the same power supply as the PISA protection module.
The protection module has one 24V input and four output channels to which the current is distributed. Each output channel is equippedwith a redundant over-current protection, which avoids that wires will be overloaded. All four output channels will shutdown
simultaneously, if the current of one individual channel or the maximum allowed current for the protection module is exceeded.
A safeguard circuit in the input stage of the PISA module works like a valve. It permits only so much current that the input voltage does
not drop below 21V. In case the input voltage would fall below this value (e.g. due to overloads, too small of a power supply or highinrush currents such as from starting a motor), all four output channels will be actively current limited and will shutdown after a certain
period of time.
A typical wiring configuration is shown below. All sensitive loads are connected directly to the power supply. If needed, these load
circuits can be protected with standard circuit breakers or fuses. Loads which are less sensitive to voltage dips or interruptions or which
are the source of the voltage drop themselves are connectedto the output of the PISA protection module.
DC24V
Non NECCLASS2 LoadPower
SupplyPISA Protection Module
A1

NECCLASS2 Circuit 1

A2

NECCLASS2 Circuit 2

A3

NECCLASS2 Circuit 3

A4

NECCLASS2 Circuit 4

Safeguard

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

3. INSTALLATION INSTRUCTIONSWARNING

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

- Turn power off before working on the device. Protect against inadvertent re-powering.
- Make sure that the wiring is correct by following all local and national codes.
- Do not modify or repair the unit.
- Do not open the unit.
- Use caution to prevent any foreign objects from entering the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
This protection module is suitable for DIN rail mounting. Use DIN rail according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Keep the following installation clearances:
Top and bottom: min. 40mm on top, 20mm on the bottom
Left and right: 0mm if the total output current of the PISA module is less than 15A, min. 6.4mm if the total output current is equal or
higher than 15A and the ambient temperature is between 45°C and 60°C, min. 6.4mm if the total the ambient temperature is between
61°C and 70°C (except for PISA11.401, PISA11.402 and PISA11.403).
The protection module can be used with any regulated 24Vdc power supply. If the power source can deliver more than 40A continuous,
the PISA module shall be equipped with an external input fuse (e.g. 30/32A). The power capability and performance of the power supply
can limit the output characteristics of the PISA module.
Make sure that the input voltage polarity is correct before applying the input voltage.
Do not connect batteries to the outputs of the PISA module. A high voltage drop between the power supply and the protection module
might cause a malfunction. It is not recommended to use wires longer than 2x2m (for 2.5mm2 wires or AWG 14) or 2x4m (for 4mm2
wires or AWG 12) to avoid undesired undervoltage conditions on the input of the protection module.
Use an appropriate wire size on the input, which matches the ampacity of the power supply.
Do not use a wire size smaller than 2.5mm2 (or AWG14) on the input, when the total output current is higher than 15A (see Fig. 2A).
Wiring schemes can be found in Fig. 3-1.
Fig. 3-1 Wiring scheme+-

PLC, Controls(sensitive loads)

PISA
Protection Module
+
24V
+
Power
Supply-+Recommended
Wire:max. 2x4m, 4mm2or 2x2m, 2.5mm2

Output 1
Output 2
Output 3
Output 4
+
Load
4
-

+
Load
3
-

+
Load
2
-

+
Load
1
-

Distribution NodeJan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

Installation Instructions for Hazardous Location Areas
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations and for use in Group II Category 3 (Zone 2) environments.
Classification: ATEX: EPS 11 ATEX 1 327 X, II 3G Ex ec nC IIC T4 Gc / IECEx EPS 22.0054X.
WARNING EXPLOSION HAZARDS!
For non-standard mounting orientations, i.e. input terminals not on bottom, a reduction of output current is required. Substitution ofcomponents may impair suitability for this environment.
Do not disconnect the device or operate the voltage adjustment unless power has been switched off or the area is known to be nonhazardous. The signal-connector may not be used in hazardous location areas unless additional measures are met to avoid anunintended disconnection (e.g. an additional mechanical fixation).
A suitable enclosure must be provided for the end product which has a minimum protection of IP54 and fulfils the requirements of the
EN 60079-7.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

4. INPUT
Input voltage
Input voltage range

nom.
max.

DC 24V
18Vdc – 30Vdc
30Vdc

Turn-on voltage
Turn-on delay of outputs

typ.
typ.

21.4Vdc
270ms

Input voltage protection level *)

min.
max.
typ.

21.0Vdc
21.8Vdc
43mA

Stand-by input current*)±25%
Absolute maximum continuous input voltage with no damage
to the PISA module
Required input voltage for turning-on the outputs
Period between applying the input voltage and turning on the
outputs. All outputs will be turned-on at the same time.
Below this voltage level, outputs will shutdown.
Stand-by current with no load current on the outputs

Voltage dips below this value can occur for maximal 200µs.

5. OUTPUTS
Output current

output 1
output 2
output 3
output 4

All 4 outputs together
Output current limitation *)Voltage drop **)Output leakage current ***)

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

24V Input
3.7A
3.7A
3.7A
3.7A
14.8A
16.6A
19.9A
23.6A
92mV
0.4mA

28V Input
3.2A
3.2A
3.2A
3.2A
12.8A
16.6A
19.9A
23.6A
81mV
0.4mA

see Fig. 5-1
see Fig. 5-1
see Fig. 5-1
see Fig. 5-1

0.4mA

*)

The current limitation value for the sum of all four output currents. This current can be drawn from each individual output before the protection module
shutdown all four outputs at the same time. Shutdown times can be found in chapter 6.
**) Voltage loss between input and output, when all output channels are loaded with 50% of its nominal current.
***) Output current when outputs have shut down

Fig. 5-1 Output current vs. input voltage

Input
Voltage

30V
29V
28V
27V
26V
25V
24V
23V
22V
0

1A

2A

3A

4A

Output Current, typJan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

6. CURRENT LIMITATION AND SHUTDOWN BEHAVIOR
The PISA11 protection module comprises one common limitation and switching element for all four outputs. In a protection event, allfour outputs limit the current or shutdown at the same time.
The following reasons can cause a limitation of the output currents or a shutdown of the output channels:
1)

The output current of one or more output channels was too high.

2)

The sum of the output current of all four output channels was exceeded.

3)

The outputs needed to be shutdown in order to maintain sufficient input voltage.

Shutdown times*) when exceeding the rated output current:
At 2-times the rated current
At short circuit
*)

typ.
typ.

1s at 7.4A
10ms

The timer for shutdown starts immediately once the rated current levels are exceeded. All output channels will shutdown, if one channel is overloaded. See
Fig. 6-1 for more values.
A shutdown of the outputs can also happen earlier, e.g. when the PISA module has to protect the supply voltage in case the power supply can not deliver
enough current to support all loads without going into overload.

Fig. 6-1 Shutdown characteristic

Shutdown Time, typ.
100s

10s

1s

100ms

10ms
0

1

2

3

4

5

6

7

8

9

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26A
Output Current, typ.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

Shutdown behavior to avoid under-voltage situations on the supply voltage
A further limitation of the output current activates when the supplying power source can not deliver enough current to support all loads
without bringing the power source into overload followed by a voltage drop. In such an event, the voltage dependent current limitationof the input stage of the protection module is activated (safeguard circuit). This safeguard circuit acts like a valve only permitting somuch current so that the supply voltage does not fall below 21V. The period of time for how long the protection circuit is able to actively
limit the current depends on the difference between input and output voltage and the current which flows through the PISA protection
module and is limited to a maximum of 5s. All four outputs will shutdown simultaneously.
Shutdown times for a short circuit condition across the outputs can be found in Fig. 6-2.
Fig. 6-2 Active current limitation – Period of time in current limiting mode until the outputs will shutdown
Test Setup

Output Current(Sum-current of all output channels - IOUT)
20A

Load

18A
16A
14A

Adjustable
Power
Supply

+

IOUT

-

IOUT
PISA
Module

I= 0,8*IOUT

Short

12A
10A
8A
6A

20°C

4A

45°C

2A
10ms

100ms

1s
5s 10s
Shutdown Time, typ.

Test Procedure:
1. Set the output current of the adjustable power supply to the test
current value.
2. Set load current to 80% of the test current and wait for athermally stable condition.
3. Short circuit the output of the PISA module and measure thetime until the outputs shutdown.
No single output channel is allowed to be overloaded
The output current is the sum of all outputs.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

7. CONNECTING CAPACITIVE LOADS TO THE OUTPUTS
Large input capacitors of drives, monitors or other similar loads can result in an unintended shutdown of the module when trying toturn-on such loads. This especially can occur after a reset or by turning on a load via the push button or the external signal input. ThePISA protection module is designed to be exceptionally compatible with such types of loads. The module can turn-on as muchcapacitance as possible and comprises several different protection mechanisms to protect against an unintended shutdown or damageof the unit.
The permissible capacitor sizes which can be connected to the output of the PISA module depends on the load current itself as well ason the characteristic of the load.
The following tables show two typical cases (case A and case B) for the permissible capacitors, which can be connected on the outputs
without shutdown of the protection module. The listed values are valid for the entire temperature range.
Case A: All outputs are loaded.
The minimum values are worst-case figures for the permissible capacitors which are defined with an additional constant current load
and with the maximum permissible total current of the PISA protection module. See also the parameter list below the table.
The typical values are defined with an additional resistive load. See also the parameter list below the table.
Permissible Capacitors

PISA11.CLASS2

Per channel
All four outputs together

58mF
14mF
58mF
14mF

typ.
min.

Parameters: Typical values are with an additional 1.9A resistive load per output.
Minimum values are with an additional 3.7A constant current load per output.

Case B: Only one output is loaded
The minimum values for the permissible capacitors are defined with an additional constant current load according to the parameter list
below. During the tests, only one output is loaded and all others are not.
The typical values for the permissible capacitors are defined with an additional resistive load according to the parameter list below.
During the tests, only one output is loaded and all others are not.
Permissible Capacitors

PISA11.CLASS2

Per channel

typ.
min.

68mF
45mF

Parameters: Typical values are with an additional 1.9A resistive load. Minimum values are with an additional 3.7A constant current load.
Fig. 7-1 Test setup for capacitive load measurements+-

4x RSense
10mOhmPISA11
Protection
ModuleOut-1

1m, 2.5mm

+

Out-3

1m, 2.5mm2

-

Out-4

Power
Supply24V, 40A *)2

1m, 2.5mm2

1m, 1.5mm2
1m, 1.5mm2

Out-2

1m, 1.5mm2
1m, 1.5mm2

R/ I
Load

R/ I
Load

R/ I
Load

R/ I
Load

Distribution Node0.3m, 1.5mm2*) The allowable capacitor size canbe larger with power supplies equal
or smaller 20A output current

0.3m, 1.5mm2
0.3m, 1.5mm2
0.3m, 1.5mm2Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

8. OUTPUT-OK RELAY CONTACT
This relay contact is closed when the input voltage is sufficient and the outputs are not shutdown.
Threshold voltage

typ.

21.4Vdc

Contact ratings

max.
max.
min.
nom.

30Vdc, 1.0A
30Vac, 0.5A
1mA at 5Vdc
500VacGalvanic isolation

Required voltage to power the relay and to close therelay contact. The outputs must also not be shutdown.
Resistive load
Resistive load
Test voltage: Signal path to power path

9. ON/OFF AND RESET SIGNAL INPUTThis signal input is galvanically isolated with an integrated optocoupler and works in the same manner as the reset and ON/OFF button.
The ON/OFF function has no safety feature included.
In a failure mode (outputs have shutdown), the outputs can be turned on again by applying a voltage 12(+)
3mA
for more than 1 second.
Inhibit
In normal mode (outputs have not shutdown), a short (> 50ms) voltage pulse will turn all outputs ON
or OFF.

5.1V

11(-)

The unit will be shipped (factory setting) with the outputs turned-on.
Signal voltage
Signal current

max.
typ.
max.
min
max.
nom.

Threshold voltage levels
Galvanic isolation

30Vdc
3mA
6mA
6Vdc
10Vdc
500VacActive current limited
active current limited
Voltages above this level will trigger the inhibit orreset.
Test voltage: signal path to power path

10. SYNCHRONIZATION OF MULTIPLE PISA MODULES
If multiple PISA modules are used on the same power supply, it is recommended to connect the sync. bus of all modules together. If one
unit shuts down due to the protection function of the input voltage protection circuit (safeguard), all other modules will shutdown too.
This avoids a false interpretation of which output channel caused the problem. If the sync. terminals are not linked, the module with thehighest safeguard protection voltage level (caused by tolerances) would shutdown first regardless whether the failure was caused bythis module or not.
Please note:
If the cause for the shutdown was an overcurrent of one individual channel only thismodule will shutdown and the other modules
will stay on. In this case the sync. line has no
impact on the other modules.

1 2 3 4
Outputs

QT40.241
Power
SupplyPISA11
16
15
14
13
12
11

Input
L1 L2 L3 PE

1 2 3 4
Outputs

Output+ -PISA11
16
15
14
13
12
11

sync.
OK

+
Reset
-

OK

+
Reset
-

-

+

-

OK

+
Reset
-

sync.
OK

+
Reset
-

Input

-

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278-0 Germany

PISA11
16
15
14
13
12
11

sync.

Input

-

1 2 3 4
Outputs

PISA11
16
15
14
13
12
11

sync.

Input
+

1 2 3 4
Outputs

+

-

Input

-

+

-

-

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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

11. FUNCTIONAL DIAGRAM
Fig. 11-1 Functional diagram

Input

Failure+-Safeguard
for Minimum
Input Voltage

I SenseI Sense+ Output 1
FailureCurrent
Limiter &Shut-downManager

Input
Status
NEC-CLASS-2
Controller

I Sense+ Output 2

Redundant
Emergency
SwitchFailureI Sense+ Output 3

Reset,
ON/OFF
12
Reset,
ON/OFF 11(+)(-)

Outputs- 13
OK
Contact 14
Sync.

15
16

Reset,
ON/OFF
OutputOK
Synchronization

FailureI Sense+ Output 4

OutputCurrent
Monitor12. BACK-FEEDING LOADS
Loads such as decelerating motors and inductors can feed voltage back to the PISA11 protection module. This feature is also called
return voltage immunity or resistance against Back- E.M.F. (Electro Magnetic Force).
The protection module is resistant and does not show malfunctioning when a load feeds back voltage up to 30Vdc to the protection
module. It does not matter whether the protection module is on or off.
The protection module has no capability to absorb energy. Internal diodes (integrated body diodes of the Mosfets) directs the voltage
and energy to the power supply, which is connected on the input side of the protection module. The power supply defines the amountof energy which can be absorbed.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

13. POWER LOSSES
No-load losses
Losses at typical output loads*)
*)

typ.
typ.

PISA11.CLASS2
1.0W
1.6W

Typical value when all output channels are loaded with 50% of its nominal current.

14. LIFETIME EXPECTANCY AND MTBF
The PISA protection modules are extremely reliable and use only the highest quality materials. The number of critical components suchas electrolytic capacitors have been reduced.

Applied load
Lifetime expectancy *)MTBF **) SN 29500, IEC 61709
MTBF **) MIL HDBK 217F, GB

PISA11.CLASS2
4x1.9A
220 000h *)622 000h *)at 40°Cat 25°C

2 198 000h
3 784 000h
734 000h
1 009 000h

at 40°Cat 25°Cat 40°Cat 25°C*)

The Lifetime expectancy shown in the table indicates the minimum 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
manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years (131 400h). Any number exceeding this value is a calculated
theoretical lifetime which can be used to compare devices.
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a device. It is the statisticalrepresentation 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 000h means that statistically one unit will failevery 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit has been running for 50 000h or only for 100h.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

15. FRONT SIDE AND USER ELEMENTS
A
B

C

D

E
F

G

H

Output Terminals (plus (+) pole connection points)
Red Failure LEDs
The red LEDs are failure indicators. Any time a red LED is on or blinking, theoutputs have been shutdown.
Three reasons why the outputs have been shutdown:
1) The output current of one or more individual output channels was too high.
In this case, the affected output channel LED is blinking and all others are
illuminated.
2) The sum of the output current of all four output channels was exceeded. In
this case, all red LEDs are blinking.
3) The outputs needed to be shutdown in order to maintain sufficient input
voltage. In this case, all red LEDs are on and the green LED (Input Status) isblinking.
The outputs can also be turned off by pushing the ON/OFF button on the frontof the unit or by applying an external signal to the ON/OFF signal input. In thiscase, all red LEDs are on.
When LED 1 and 4 as well as the LEDs 2 and 3 are alternately blinking, aninternal error has occurred. Try to reset the unit by pushing the reset button. If
this does not help, ship the unit to the factory for inspection.
ON/OFF and Reset Button
This is a pushbutton which can be used for two purposes:
1) In a failure mode (outputs have shutdown), the outputs can be turned on
again by pushing and holding the reset button for more than 1 second.
2) In normal mode (outputs have not shutdown), a short (> 50ms) push willturn all outputs ON or OFF.
The unit will be shipped (factory setting) with the outputs turned-on. The ON/OFF function has no safety feature included.
Synchronization Bus (connection by plug-connector on the front), See also chapter 10.
If multiple PISA modules are used on the same power supply, it is recommended to connect the sync. bus of all modules together. If
one unit shuts down due to the protection function of the input voltage protection circuit, all other modules will shutdown too. Thisavoids a false interpretation of which output channel caused the problem. If the cause for the shutdown was an over-current of one
individual channel only this module will shutdown and the other modules will stay on. In this case the sync. line has no impact on
the other modules.
Output-OK Relay Contact (connection by plug-connector on the front), See also chapter 8.
This relay contact is closed when the input voltage is sufficient and all outputs are not shutdown.
Inhibit / Reset Signal Input (connection by plug-connector on the front), See also chapter 9.
This signal input is galvanically isolated with an integrated optocoupler and works in the same manner as the reset and ON/OFF
button. The ON/OFF function has no safety feature included.
1) In a failure mode (outputs have shutdown), the outputs can be turned on again by applying a voltage for more than 1 second.
2) In normal mode (outputs have not shutdown), a short (> 50ms) voltage pulse will turn all outputs ON or OFF.
Green Input Status LED
This LED indicates the status of the input. The green LED is illuminated if the input voltage is higher than 21Vdc. The green LED will
blink when the input protection circuit (Safeguard) is activated in order to protect the supply voltage from dropping below 21V orwhen the outputs have already been shutdown due to a low input voltage.
Input Terminals
Two minus (-) connection points for simpler load distribution or grounding (earthing) of the minus (-) pole.

Please note:
Outputs which have shutdown must be turned on manually by pushing the reset button or by an external reset signal (ON/OFF signal
input). A cycling of the input power does not reset the unit. The failure signals are stored until a reset is intentionally initiated.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

16. TERMINALS AND WIRING
All terminals are easy to access when mounted on the panel.
Input, outputs and signal terminals are separated from each other to help in error-free wiring.

Type
Solid wire
Stranded wire
AWG (American Wire Gauge)
Wire stripping length
Screwdriver
Recommended tightening torque

Input and Output
screw terminals
0.2-6mm2
0.2-4mm224-10 AWG
7mm
3.5mm slotted or
Pozidrive No 2
0.8Nm

Signals
plug connector
0.2-1.5mm2
0.2-1.5mm2
24-16 AWG
6mm
2.5mm slotted
0.35NmInstructions:a) Use NEC Class 2 rated wires for the outputb) Use appropriate copper cables that are designed for minimum operating temperatures of:
60°C for ambient up to 45°C and minimum
75°C for ambient up to 60°C and minimum
90°C for ambient up to 70°C.
c) Follow national installation codes and installation regulations!
d) Ensure that all strands of a stranded wire enter the terminal connection!
e) Screws of unused terminal compartments should be securely tightened.
f) Ferrules are allowed.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

17. EMCThis protection module is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment. A detailed EMC report is available on request.
EMC Immunity

Generic standards: EN 61000-6-1 and EN 61000-6-2

Electrostatic discharge

EN 61000-4-2

Electromagnetic RF field
Fast transients (Burst)

EN 61000-4-3
EN 61000-4-4

Surge voltage on
input lines

EN 61000-4-5+→+/- → DIN rail

Outputs
ON
8kV
8kV
10V/m
2kV
2kV
1kV
500V
1kV

Surge voltage on
output lines
Surge voltage on
signal lines
Conducted disturbanceEN 61000-4-5
EN 61000-4-5+→+/- → DIN rail
DC-OK → DIN rail

500V
1kV
1kV

500V
1kV
1kV

Criterion A
Criterion A
Criterion A

EN 61000-4-6

0.15-80MHz

10V

10V

Criterion A

Contact discharge *)Air discharge
80MHz-6GHz
Input lines
output lines
DC-OK, Inhibit

Outputs
OFF
8kV
8kV
10V/m
2kV
2kV
1kV
500V
1kV

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A

Criterion A:
The PISA protection module shows normal operation behavior within the defined limits.
*)… on coupling plane

EMC Emissions
Conducted emission
input and output lines**)Radiated emission

Generic standards: EN 61000-6-3, EN 61000-6-4
IEC/ CISPR 16-1-2, IEC/ CISPR 16-2-1
EN 55011, EN 55032

limits for DC power ports according to EN
61000-6-3 fulfilled
Class B**) provided that the supplying power source fulfills these requirements too

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

18. ENVIRONMENT
Operational temperature *)Output derating
Storage temperature
Humidity **)Vibration sinusoidal ***)

-25°C to +70°C
not required-40 to +85°C
5 to 95% r.H.
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
30g 6ms, 20g 11ms
3 bumps / direction, 18 bumps in total
0 to 6000m
III
II
2

Shock ***)
AltitudeOver-voltage category
Degree of pollution

see Fig. 18-1
see Fig. 18-1
IEC 60068-2-30
IEC 60068-2-6
IEC 60068-2-27

IEC 60664-1, altitudes up to 2000m
for altitudes from 2000m to 6000m
IEC 62103, EN 50178, not conductive*) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
**) Do not energize while condensation is present.
***) Tested in combination with DIN rails according to EN 60715 with a height of 15mm and a thickness of 1.3mm and standard mounting orientation.

Fig. 18-1 Output current vs. ambient temperature

Allowed Output Current per Output at 24V

4A
3.7A
3A
2A
1A
0
-25

0

20

40

60 70°C

Ambient TemperatureJan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

19. PROTECTION FEATURES
Output over-current protection
Class of protection
Degree of protection

Electronically limited
III
IP 20

Penetration protection
Over-temperature protection
Reverse polarity protection; input
voltage
Internal input fuse

> 2.5mm in diameter
Not included
Not included

IEC 61140
EN/IEC 60529
E.g. screws, small parts
Make sure that the input voltage polarity is correct before
applying the input voltage.

Not included

20. DIELECTRIC STRENGTH
The relay contact and the ON/OFF signal input are floating and have no ohmic connection to the input or output voltage. Type andfactory tests are conducted by the manufacturer.
The creepage and clearance distances between relay contacts, the ON/OFF signal input and input/output voltage are 1.3mm.
The following dielectric strength tests were conducted:

Type test

60s

A
500VacB
500VacC
50Vac

Factory test

5s

500Vac

500Vac-Field test

5s

500Vac

500Vac

50Vac

> 1mA

> 1mA

> 1mA

Fig. 20-1 Dielectric strength

Input +, Output (1 - 4)
Sync. (15,16)

B

A

Reset, ON/OFF
Signal Input

Cut-off current setting+ 12

Output-ok
Contact

C

- 11

13
14

Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using the appropriate test
equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all input and output terminals together as well as
all signal poles before conducting the tests. When testing, set the cut-off current settings to the value in the table above.

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

21. APPROVED, FULFILLED OR TESTED STANDARDSUL 508

IEC 61010-2-201

IEC 60950-1
UL 60950-1

UL 2367

ATEX

IEC 60079 (IECEx)

Class I Div 2

Marine (DNV)

Marine (ABS)NEC Class 2

UL Certificate
Listed equipment for category NMTR - Industrial Control Equipment
Applicable for US and Canada
E-File: E198865
CB Scheme Certificate
Electrical Equipment for Measurement, Control and Laboratory Use Particular requirements for control equipment
CB Scheme Certificate
General safety requirements for Information Technology Equipment (ITE)UL Certificate
Recognized component for category QQGQ - Information Technology
Equipment (ITE)
Applicable for US and Canada
E-File: E137006
UL Certificate
Recognized component for category QVRQ - UL 2367 Standard for Solid
State Overcurrent Protectors - Supplementary protector
Applicable for US
E-File: E342020
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7, EN 60079-15 Equipment protection by type of protection"e" and "n"Certificate: EPS 11 ATEX 1 327 X
Temperature Code: T4
Type of Protection: ec nC
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7, IEC 60079-15 Equipment protection by type of protection"e" and "n"Certificate: IECEx EPS 22.0054X
Temperature Code: T4
Type of Protection: ec nC
CSA Certificate
Power Supplies for Hazardous Location
Applicable for Canada and US
CSA Class: 2258-02 (Canada), 2258-82 (USA)
Temperature Code: T4
Groups: A, B, C and D
DNV Certificate
DNV Type approved product
Certificate: TAA00002A7
ABS Design Assessment Certificate
ABS (American Bureau of Shipment) assessed product
Certificate: 22-2231447-PDA
Manufacturer's Declaration
NEC Class 2 - Limited Power Source
Listed device according to NEC Handbook chapter 725-121

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

Manufacturer's Declaration (Online Document)
Environmental Tests, Flowing Mixed Gas Corrosion Test
IEC 60068-2-60 Method 4
Test Ke - Method 4
H2S: 10ppb
NO2: 200ppb
Cl2: 10ppb
SO2: 200ppb
Test Duration: 3 weeks, this simulates a service life of 10 years.
Manufacturer's Declaration (Online Document)
Airborne Contaminants Corrosion Test
ISA-71.04 G3
Severity Level: G3 Harsh
H2S: 100ppb
NOx: 1250ppb
Cl2: 20ppb
SO2: 300ppb
Test Duration: 3 weeks, this simulates a service life of 10 years.

IEC 60068-2-60

ISA-71.04 G3

22. REGULATORY PRODUCT COMPLIANCE
EU Declaration of Conformity

REACH Regulation (EU)

WEEE Regulation

EU Declaration of Conformity
Trade conformity assessment for Europe
The CE mark indicates conformance with the European- EMC directive- ATEX directive- RoHS directive
Manufacturer's Statement
EU regulation regarding the Registration, Evaluation, Authorisation andRestriction of Chemicals (REACH) fulfilled.
Manufacturer's Declaration
EU Regulation on Waste Electrical and Electronic Equipment
Registered as business to business (B2B) products.
EU Regulation 2012/19/EU

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

23. READ-OUT OF THE SOFTWARE REVISION LEVELPISA utilizes a microcontroller with a dedicated firmware to control the whole unit. The revision level of the used firmware can be
determined as follows:
Press and hold the reset button before applying the input voltage. The pattern of the four red LEDs shows the firmware revision level.
Revision
level

LED 1

LED 2

LED 3

LED 4

A
B
C
D
E
F
G
H
I
J
K
L
M
N
O

OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON

OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
ON
ON
ON

OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON
OFF
OFF
ON
ON

ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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PISA11.CLASS2PROTECTION MODULE 24V, 4 OUTPUTSPISA11-Series

24. PHYSICAL DIMENSIONS AND WEIGHT
WeightDIN rail
Installation clearances

120g
Use 35mm DIN rail according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN rail depth must be added to the unit depth to calculate the total required installation depth.
See chapter 3

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

25. ACCESSORY
25.1. ZM3.WALL WALL MOUNTING BRACKET(bulk-package with 25 pcs.)
DIN rail bracket for wall or panel mount:Note: The picture is for representation only.

Hole diameter: 4.2mm

Jan. 2024 / Rev. 1.8 DS-PISA11.CLASS2 - data sheet All parameters are specified at 24Vdc input, 25°C ambient temperature and a 5 minutes run-in time unless otherwise noted.
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