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Section 4: Trouble Supervision
4.1 Supervision via FACP Notification Appliance Circuit
4.1.1 Supervision of FACP to HPF24S wiring
The FACP (Fire Alarm Control Panel) supervises the connection between itself and the HPF24S
via the control panels NAC End-of-Line Resistor (ELR). The ELR must be installed at the FCPS
end of the circuit, after the last notification appliance on the circuit. If no additional devices are
connected from the HPF24S Control Input terminals, the ELR must be connected across terminals
5 & 6 for Control Input Circuit #1 and across terminals 7 & 8 for Control Input Circuit #2. An open
or short anywhere on the control panel's NAC or power supply NAC will be detected at the FACP
as a NAC trouble.
IMPORTANT: If additional notification appliances are connected to the Out terminals 5 & 6 of
Control Input Circuit #1 or extended from Control Input Circuit #2 Terminals 7 & 8, the ELR must
be installed after the last device on the circuit.
4.1.2 Supervision of HPF24S Faults
The FACP will detect HPF24S power supply faults as an open circuit condition on its NAC. An
internal trouble contact is located between TB4 Terminal 3 (In+) and TB4 Terminal 5 (Out+). Any
of the following conditions will cause the trouble contact to open, provided the FACP Notification
Appliance Circuit is not in alarm. The following trouble conditions will cause a general NAC trou-
ble:
•
A field wiring fault on the NAC output of the power supply
•
An AC fail condition at the power supply (only if SW1 switch 4 is ON and a 2 hour delay has
expired. If SW1 switch 4 is OFF, the Internal Trouble contact will not respond to an AC fail
condition)
•
A battery fail condition at the power supply
•
A battery charger fail on the power supply
•
A ground fault condition on the power supply (zero impedance between power supply and
ground)
Any power supply trouble will break the connection between the FACP and the ELR connected to
Control Input #1 provided the FACP's NAC is not in alarm. The FACP's ELR must be placed after
the last notification appliance connected to FCPS terminals 5 & 6 on TB4 or, if no devices are con-
nected to these terminals, the ELR must be connected directly across terminals 5 & 6.
If trouble monitoring is required when the power supply is in alarm, the Trouble Relay at TB5 can
be used for this purpose. An addressable monitor module may be used to monitor these contacts.
Refer to "Aux. Trouble Relay/AC Fail Relay" on page 25 in the following section.
NOTE: Control Input #2 (terminals 7 & 8) cannot be used to supervise the power supply for
internal troubles, but an ELR is still required for FACP wiring supervision.
4.1.3 Aux. Trouble Relay/AC Fail Relay
The HPF24S power supply has one fail-safe Form-C aux. trouble relay located at TB5. The con-
tacts can be monitored by an FACP input circuit or an addressable monitor module as illustrated
below. The Aux. Trouble Relay responds to HPF24S power supply troubles depending on the set-
ting of SW1 switch 4.
HPF24S Series Power Supplies — P/N 52751:E1 4/14/2011
25
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