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Installation 15088:J 10/22/99
Test of Ground Fault Detection Circuit
If you have a persistent ground fault and suspect the MPS-24A ground fault detection circuit may be generating
a false indication, use this test:
1. Remove the upper right circuit board mounting screw, just to the right of P2.
2. Insert an insulator (a piece of paper will do) between the power supply circuit board and the
mounting standoff.
If the ground fault indication remains, the problem is with the MPS-24A.
Section 3.2.1 The MPS-TR Main Power Supply Monitor
The MPS-TR power supply monitor mounts on any of the MPS series power supplies. This add-on board mounts
on the right side of the MPS series supply and it is fastened through the use of two extended length standoffs,
making use of threads on the existing standoffs (Figure 3.2-1).
The MPS-TR monitor provides supervision for remote power supplies and control of the power supply battery
charger when there is no CPU-1010/2020 or XPP-1 to provide these two functions. The board is mounted and
secured as described above. P1 on the MPS-TR is connected to P3 on the power supply via a power ribbon
cable(part number 71085) supplied with the MPS-TR. The relay common and normally closed contacts of the
MPS-TR are connected to a normally closed TROUBLE INPUT on the control panel trouble monitoring circuit.
MPS-TR Installation
1. Remove the upper and lower screws on the right side of the power supply main board.
2. The MPS-TR mounts on these two holes. Thread the new longer screws and the standoff
sleeves into the holes formerly occupied by the two screws removed in Step 1.
Figure 3.2.1-1 Threading the New Screws
Monitoring Remote Power Supplies
The MPS-24A depends on the CPU-1010/2020 or the XPP-1 to control its battery charging circuit and to monitor
the battery state approximately every four minutes. If you use the MPS-24A in a remote application from the
main control panel or a transponder, add the MPS-TR to the power supply to prevent problems keeping the
batteries charged. The MPS-TR has a trouble relay that should be monitored by a system monitoring device.
Note that the CPU or the XPP-1 can control only one power supply.
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