48 Installation—Installing the FC-2000
Up to 2.0 amps of RMS regulated current for powering indicating
appliances can be drawn from TB2 terminals 3 (+) and 4 (-). Power is not
removed from these terminals during system reset.
Note: This output is not suitable for powering annunciators!
Internal power for the system is provided via the power harness. Connect
this harness from P2 on the MPS-24B to the CPU. Signaling between the
CPU and the MPS-24B is accomplished through connection of the power
ribbon (71085) to P3 on the MPS-24B.
Figure 34: Field Wiring the MPS-24B Power Supply
Indicating
Appliance Power
(24 VDC)
System Harness
Connections
Field Wiring the
MPS-24B Power
Supply
Battery (+)
Battery (-)
P3
P2
P4
JP3
TB1
P5
1 2 3 4 5
1 2 3 4 5 6
TB2
JP1
JP2
P6
Secondary Power
27.6 VDC, 6.5 to 17AH. Supervised
and power-limited.
Fast Charge = 750 mA max.
Trickle Charge = 20 mA (typ)
LED Indicators
Negative Ground Fault
Positive Ground Fault
Battery Fail
AC Power Fail
Supervisory Cable to AVPS-24
No Connection
Cut JP1 to make 4-Wire Smoke
Detector Power on TB2 Terminals 1 and 2
a non-resettable circuit.
System Trouble Bus
(Normally low voltage goes high
to +5 VDC when MPS-24B enters
a trouble condition.)
Common
Indicating Appliance Power
+24 VDC power limited, filtered,
RMS regulated, non-resettable, 2.0 amps
(in alarm) max. Power is supervised by
output module (such as an ICM-4). Not
for annunciators!
Common
Cut JP2 to disable the
battery charger when
employing the NR45-24
Remote Battery Charger.
Earth Ground
Connect to chassis with
a grounding cable
assembly (71073).
Neutral
Hot
Primary Power
120 VAC, 50/60 HZ, 1.8 amps max.
4-Wire Smoke Detector Power
+ 24 VDC (20.4-26.4, 200 mV ripple),
200 mA max. Filtered, regulated, and
resettable. Power limited but when
used for 4-wire smoke detectors, must be
supervised by a UL Listed Power
Supervision Relay. Power run to
ACM annunciators is inherently supervised.
Cut R55 to disable Earth Fault Detection
mps-24b
Ground
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