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The MPS-24B/MPS-24BE Main Power Supply
16
XP Series Transponder PN 15888:G 6/11/98
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The MPS-24B/MPS-24BE automatically employs Ground Fault Detection (required in
Canada) unless resistor R55 is removed. This feature must be disabled on all but one
power supply if multiple power supplies are present and share a common signal
reference.
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Up to 200 mA of current for 24 VDC four-wire smoke detectors can be drawn from
TB2 Terminals 1 (+) and 2 (-) on the MPS-24B/MPS-24BE. Power is removed from
these terminals momentarily during system reset (unless jumper JP1 is removed to
configure the output for continuous annunciator power). This filtered four-wire smoke
detector power is power limited but must be supervised via an end-of-line power
supervision relay. This power supervision relay is energized by the four-wire smoke
detector power and the relay contact must be wired in series with an XPM-8 or XPM-
8L IDC.
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Internal power for the XP Transponder is provided via the Power Harness 75100 or
75099. Connect this harness from P2 on the MPS-24B/MPS-24BE to P9 on the XPP-1.
Supervisory information is transferred between the XPP-1 and the MPS-24B/MPS-
24BE through the Supervisory Power Ribbon Cable (71031) which is connected from
P7 on the XPP-1 to P3 on the MPS-24B/MPS-24BE.
