HST HP101U, Installation And Operation Manual

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A.1 Main Power Supply
The PANEL provides filtered power for operating the fire alarm control panel, operating external devices and
operating the standby battery. The power for operating external devices is limited. Use Table A-2 (standby or
non-alarm) and Table A-3 (alarm) to determine if external loading is within the capabilities of the power supply.
TABLE A-2: Filtered Load in Standby @24 VDC.
# of Current
Device Type Devices (amps)
Total Current
(amps)
Main Circuit Board 1 X 0.08 =
2-wire Detector Heads [ ] X [ ]
1 =
4-wire Detector Heads [ ] X [ ] 1 =
Power Supervision Relays 2 [ ] X 0.025 =
Current Draw from DC24V
(nonalarm 3 ) =
0.08
Sum Column for Standby Load = amps
1. Refer to the Device Compatibility Document for 2-wire smoke detector standby current.
2. Must use compatible listed Power Supervision Relay.
3. The total standby current must include both the resettable and nonresettable DC24 output.. Caution must be
taken to ensure that current drawn from these outputs during alarm does not exceed maximum ratings specified
(see Table A-2).
TABLE A-3: Filtered Load in Alarm @24 VDC .
# of Current
Device Type Devices (amps)
Total Current
(amps)
Main Circuit Board 1 X 0.138 =
4-wire Smoke Detector 2 [ ] X [ ] =
Power Supervision Relay 3 [ ] X 0.025 =
Notification Appliances 4 [ ] X [ ] =
Notification Appliances [ ] x [ ] =
Current Draw from DC24V (alarm current) =
0.138 1
Sum Column for Standby Load 5 = amps
1. The current shown represents one zone on the Main Circuit Board in alarm. For all zones in alarm, the current
draw increases to 0.590 amps.
2. Current limitations of terminals:
Nonresettable power :1.0 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10 mVRMS
Resettable power: 1.0 amps, filtered, 24 VDC +/-5%, 120 Hz ripple @ 10 mVRMS,
3. Must use compatible listed Power Supervision Relay
4. Current limitation of per Notification Appliance Circuit expandable to 1.25 amps.
5. Total current draw listed above cannot exceed 3.0 amps
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