Installation—Installing the FC-2000 47
Note: The MPS-24B has been designed to support single-cabinet row
systems only. This amounts to enough power for the CPU and up
to three other modules as a maximum.
The MPS-24B Main Power Supply is an supply capable of powering the
system continuously during standby and alarm conditions. A total of
750 mA @ 24 VDC regulated is available for operating the system during
standby conditions.
Figures 34 and 35 illustrate connections for primary and secondary power
to the MPS-24B Main Power Supply, as well as terminal and harness
connections.
With the breaker at the main power distribution panel turned off, remove
the plastic insulating cover from terminal block TB1 and connect the
system primary power source. Connect the service ground to TB1 2.
Ground the power supply assembly to the cabinet with a chassis ground
cable (71073) to TB1 terminal 2. Connect the primary neutral line to TB1
terminal 3 and the primary hot line to TB1 terminal 4. Do not route
120 VAC wiring in the same conduit as other circuits. After completion
of these connections reinstall the plastic insulating cover over the terminal
strip. Leave the main power breaker off until installation of the entire
control panel is complete.
Secondary power (batteries) is required to support the system during loss
of primary power. These batteries reside in the control panel cabinet.
Connect the battery positive cable to TB2 terminal 5 (+) and the battery
negative cable to TB2 terminal 6 (-). Do not connect the battery
interconnect cable at this time. This connection will be made just after
initial primary system power-up.
The MPS-24B automatically employs detection of earth faults in the
system (unless resistor R55 is removed).
Up to 200 mA of current for 24 VDC 4-wire smoke detectors can be
drawn from TB2 terminals 1 (+) and 2 (-). Power is removed from these
terminals during system reset (unless jumper JP1 is removed). This
regulated 4-wire smoke detector power is power-limited but must be
supervised via a UL Listed power supervision relay. The power
supervision relay is energized by the 4-wire power circuit and its contact
must be connected in series with an initiating device circuit.
The 4-wire smoke detector output is the only source on the MPS-24B that
can be used to power ACM annunciators. The power run to the
annunciators is inherently supervised (loss of communications error).
Note: The total current draw for all annunciator modules and 4-wire
detectors cannot exceed 200 mA either in standby or in alarm.
MPS-24B Main
Power Supply
Connecting the
Primary Power
Source (120 VAC,
50/60 Hz,
1.8 amps)
Connecting the
Secondary Power
Source (24 VDC)
Earth Fault
Detection
4-Wire Smoke
Detector Power
(24 VDC)
Annunciator
Power (24 VDC)
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