Power Supply; Electrical Ratings - Honeywell NOTIFIER SCS Series Operation And Installation Manual

The SCS⁄SCE

Power Supply

Power for the Smoke Control Station is provided via a separate power loop from the control panel which is inherently supervised (loss of
power also results in a communication failure at the control panel). If the SCS-8 is powered remotely, it must be powered by a Power Lim-
ited power supply listed for fire protective signaling and there must be a common connection between the negative battery terminals of each
supply. Use of the RPT-485 isolator/repeater in the control panel to isolate the EIA-485 line eliminates the need for the common connection
between power supplies.
The SCS-8 can be powered by NFS-640, AMPS-24 or other regulated power supply listed for fire protective signaling service. A Power
Supervision Relay is not required for the power connection to the SCS-8 since loss of power at the SCS-8 will result in a communication
fault at the control panel. Refer to the appropriate FACP manual for terminal connections. The total amount of current drawn from these ter-
minals cannot exceed the power supply rating in standby or in alarm.

Electrical Ratings

The input voltage and current draw (used for battery calculations) for the SCS-8⁄SCE-8 during all primary fire, primary non-fire, and second-
ary non-fire conditions is listed below:
Calculating SCS-8⁄SCE-8 Current Draw @ 24 VDC
The SCS-8⁄SCE-8 must be considered when calculating primary and secondary power requirements for the FACP or network annunciator
that powers them. Refer to the appropriate manual for the calculation of power requirements for the entire system.
46
Fire Alarm Control Panel
Use of an RPT-485 in the FACP for
isolation is recommended. If this is
not practical, a common tie must be
connected between multiple power
supplies or the EIA-485 will not
function properly!
Note: All SCS/SCE modules configured for FSCS mode must be installed in the
same room as the FACP or Network Annunciator to which they are connected.
Figure 3.16 SCS-8 with Remote Power Connection
Input Voltage: 18-32VDC
Input Current: FSCS Mode
SCS-8 62 mA
SCE-8 36 mA
FSCS Mode:
[ ] # of SCS-8 Modules in FSCS Mode X 62 mA = [
[ ] # of SCE-8 Modules in FSCS Mode X 36 mA = [
HVAC Mode:
[ ] # of SCS-8 Modules in HVAC Mode X 50 mA = [
[ ] # of SCE-8 Modules in HVAC Mode X 36 mA = [
Power loop
EIA-485 Circuit
EIA-485
Circuit
HVAC Mode
50 mA
36 mA
FSCS Total 24 VDC = [
HVAC Total 24 VDC = [
SCS Series Manual — P/N 15712:L 7/18/16
SCS-8⁄SCE-8 Installation
SCS-8 in a Backbox,
powered from FACP
SCS-8/SCE-8 in an
ABS-4D, powered
from a remote Power
Limited power supply
listed for fire
protective signaling
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