Data Sheet

EN54C series power supply unit
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
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