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C
T
HAPTER
Operation
3.0 Trouble Supervision
12
Page
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HREE
When a trouble occurs on the FCPS, it must also appear on the main Fire Alarm Control
Panel. The remote power supply has two ways of sending this trouble signal to the
FACP. However, only one of the trouble reporting methods may be used.
3.1 Supervision via FACP Notification Appliance Circuit
Supervision of FACP to FCPS Wiring
The FACP supervises the connection between itself and the FCPS via an End-of-Line
Resistor (ELR). The ELR must be installed at the FCPS end of the circuit. If no additional
devices are connected to these terminals, the ELR must be connected directly across
terminals 3 and 4. An open or short on this circuit will be detected at the FACP as an
NAC trouble (refer to Figure 4-2).
Supervision of FCPS Faults
The FACP will detect these power supply faults as an open circuit condition on its NAC.
Any of the following conditions will cause an internal trouble contact on the FCPS to open
provided the FACP NAC is not in alarm:
a) A field wiring fault on any output of the power supply during the inactive state.
b) An AC fail condition at the power supply (may be delayed depending on R134).
c) A battery fail condition at the power supply.
d) Battery charger fail.
e) Earth Fault condition.
Any power supply trouble will break the connection between the FACP and the ELR
provided the FACP's NAC is not in alarm. The FACP's ELR must be placed after the
last NAC appliance connected to FCPS terminals 3 & 4 or, if no appliances are
connected to these terminals, the ELR must be connected directly across terminals 3
& 4 (refer to Figure 4-2 and 4-3).
Note: Circuit Control Input #2 cannot be used to supervise the power supply but an ELR
is still required for FACP wiring supervision.
Multiple FCPS-24 Controlled by a Single NAC
In a standby condition with no troubles, the FACP NAC output produces a negative
voltage which forces current to flow through the ELR. If any FCPS is in a trouble state,
that FCPS will open connection between input terminal TB3.1 and TB3.3. This will cause
a break in the NAC, which will then be reported by the FACP as a NAC open trouble.
The alarm polarity sent by the FACP will always force restoration of connection between
TB3.1 and TB3.3 on all FCPS units, unless this function was disabled by cutting resistor
R63 or by the removal of JP2 and D31 (refer to Figure 3-1).
Document # 50079 Rev. D
firealarmresources.com
05/23/97
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