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The MPS-24A/MPS-24AE Main Power Supply
12
XP Series Transponder PN 15888:G 6/11/98
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The MPS-24A and MPS-24AE Main Power supplies are capable of powering the XP
Transponder continuously during non-alarm and alarm conditions. A total of 3.0 amps
(internal) @ 24 VDC filtered is available from the MPS-24A/MPS-24AE main power
supply for operating the system during non-fire alarm conditions. Up to 6.0 amps @ 24
VDC can be drawn from the MPS-24A/MPS-24AE during an alarm condition, when
the transponder is functioning in local mode. If the XP Transponder is being used as a
peripheral panel of an FACP, only a total of 3.0 amps may be drawn from the MPS-
24A/MPS-24AE. This is because the charger circuit of the MPS-24A is not turned off
during alarm unless the transponder is operating in local mode and not communicating
to the FACP or the charger is disabled because an NR45-24 external charger is
connected and JP1 has been cut. If the charger is operating there is only a 3.0 amp
capacity for both internal (transponder modules) load and external load such as
notification appliances. Six amps are available continuously (alarm and non-alarm)
when JP1 is cut and the external NR45-24/NR45-24E battery charger is employed, in
both peripheral and local mode. JP2 must be cut for all Transponder applications!
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The MPS-24A/MPS-24AE can charge batteries up to 60 amp hours. Use the BB-55
Battery Enclosure for batteries larger than 25 amp hours.
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The MPS-24A requires 120 VAC, 50/60 Hz primary power and the MPS-24AE requires
220/240 VAC, 50/60 Hz primary power. The transponder requires connection to a
dedicated AC fire alarm circuit, which must be labeled “FIRE ALARM”. This AC
circuit must connect to the line side of the main light and power feed of the protected
premises. No other equipment may be powered from the fire alarm circuit. The AC
circuit wire run must run continuously, without disconnect devices, from the power
source to the transponder power supply. Overcurrent protection for this circuit must
comply with Article 760 of the National Electrical Code (NEC) as well as local codes.
Use 12 AWG (3.25 mm
2
) wire with 600 volt insulation for this circuit. With the circuit
breaker at the main power distribution panel turned off, remove the plastic insulating
cover from Terminal Block TB1 on the MPS-24A/MPS-24AE. Connect the system
primary AC power source. Connect the service ground to TB1-3 and ground the power
supply assembly to the cabinet with a chassis ground cable (71073) from TB1-3.
Connect the AC Neutral line to TB1-4 and the AC Hot wire to TB1-6. Do not route AC
wiring in the same conduit as other XP Transponder circuits. After completion of these
connections, reinstall the plastic insulating cover over the terminal block. Leave the
main power breaker off until installation of the XP Transponder is complete.
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Secondary power (batteries) is required to support the XP Transponder during loss of
primary AC power. Batteries may reside in the XP Transponder cabinet, or in a
separate NR45-24/NR45-24E Remote Battery Charger cabinet or BB-55 cabinet, which
can be mounted up to 20 feet away from the XP Transponder (for connection of an
NR45-24/NR45-24E, refer to Figure 16). Connect the Battery Positive Cable (71071)
to TB2-1 (+) and Battery Negative Cable (71072) to TB2-2 (-) on the MPS-24A/MPS-
24AE.
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