TROUBLESHOOTING
TROUBLESHOOTING FLOWCHARTS
5 - 4 I-E96-506B1
®
17. If the system status LED is red, the bus voltages check
good and there are no LED conditions on the power modules,
the problem is caused by the external inputs being monitored
by the bus monitor module.
18. If customer external power supply voltages are being moni-
tored at the AUX BUS MONITOR inputs to the power entry
panel, verify the jumper settings on the bus monitor module
are correctly set for the voltage levels being monitored (refer to
Table 3-2 for jumper settings).
19. If switch settings are okay, measure the voltages between
terminals 1 and 2 and terminals 3 and 4 of TB4 on the PEP
rear panel. Voltages should be:
•
Greater than 22 VDC if set for 24 VDC.
•
Greater than 44 VDC if set for 48 VDC.
•
Greater than 115 VDC if set for 125 VDC.
If the voltages are correct, there is a problem in one of the aux-
iliary status inputs (STATUS IN) at terminal block TB3 on the
power entry panel.
20. Measure the voltage from terminal 1 and terminal 3 with
respect to terminal 2 of TB3. The voltages at these terminals
will depend on how J4 and J5 are set on the bus monitor mod-
ule.
If J4 and J5 are set for normally open (NO) and the voltage
measures less than 3.1 VDC, the input status is bad. If J4 and
J5 are set for normally closed (NC) and the voltage measures
more than 3.1 VDC, the input status is bad. To verify that the
external device is causing the bad status, remove the suspect
input wire. The system status LED should turn green if the
external device was pulling the input low or high, causing the
status. Otherwise, the bus monitor module is defective.
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