Notification Appliances—SCM Synchronization (Sync) Control Module 5
Table 2: Sync Control Module Current Requirements
Voltage
Rated Average
Current
Rated Peak Current
Rated Inrush
Current
20 VDC
0.010
0.040
0.060
24 VDC
0.013
0.045
0.070
31 VDC
0.015
0.055
0.090
20 VFWR*
0.013
0.055
0.085
24 VFWR*
0.017
0.063
0.099
31 VFWR*
0.020
0.078
0.127
* All VFWR voltage ratings are measured with a DC voltmeter. Multiply VFWR
voltage by 1.11 to convert to VRMS.
!
WARNING:
Personal injury hazard. Make sure that the total
current required by all devices that are connected
to the sync control module does not exceed
1.6 amperes. Overloading these sources could
result in loss of power and failure to alert
occupants during an emergency.
To calculate the total current:
1.
Use the sync strobe current requirement tables in the SL and SLM
Series Synchronized (Sync) Strobe Signals and SHW Series
Synchronized (Sync) Strobe Signals Technical Bulletins to determine
the highest value of rated average current for an individual sync
strobe.
2.
Multiply this value by the total number of the sync strobes on the
circuit.
3.
Add the current for the sync control module and for any other devices,
including any required safety factors.
Make sure that all fuses used on signaling circuits are rated to handle the
maximum inrush or peak current from all devices on those circuits.
Failure to do this may result in loss of power to the signaling circuit and
the failure of all devices on the circuit to operate.
If the power supply being used has an electronic circuit designed to
comply with National Electrical Code requirements for power limited
circuits, verify that the power supply reaction time to inrush current is
longer than 2 milliseconds for the SL and SLM strobes, and is longer than
6 milliseconds for the SHW strobe, or that that the total inrush current
presented to the power supply is less than its current capacity rating.
Total Current
