Data Sheet

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EN54M series power supplies module
Power supplies for fire alarm systems 27,6 V DC
Pulsar
®
EN54C-LS4 EN54C-LS8 .
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.
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and sequential modules
The sequential modules are designed for use with electric actuators without return spring (EN54C-LS4)
and with electric actuators with return spring (EN54C-LS8) used for fire dampers and smoke vents When
switching on the electric actuator, a short-term current surge, exceeding its rated current, may occur. If multiple
electric actuators are connected, the above-mentioned surge current poses a risk of incorrect operation of the
power supply (e.g. triggering the protection of output circuit), despite not exceeding the current capacity of the
power supply The sequential switching module causes the receivers connected to its outputs to be sequentially
switched, with a delay of 100 ms. Thanks to this solution, the surge current is reduced to the value ensuring
correct operation of the power supply
Example of connection of the EN54C-LS sequential module4 .
Example of connection of the EN54C-LS8 sequential module.
PSU
OUT1 OUT2 OUT3 OUT4
+AUX1- +AUX2-
+BAT-
ALARM
TAMPER
TEMP
AUX1
AUX2
+EXTi-
EPS
4.7 kW
4.7 kW
+ 24V -
INPUT
+AUX1- +AUX2-
+BAT-
ALARM
TAMPER
TEMP
AUX1
AUX2
+EXTi-
EPS
4.7 kW
4.7 kW
+ 24V -
INPUT
+ 24V -
INPUT