TROUBLESHOOTING
TROUBLESHOOTING DC MODULAR POWER SYSTEMS
5 - 2 I-E96-508C
®
9. If bus monitor module status LED is red, the module has
failed and must be replaced. If it is green, proceed.
10. If the system status LED is red, measure the bus voltages
at the test jacks (on the module front panel).
11. If the measurements made in Step 10 are good, look at the
power supply module status LEDs. If one or more are blinking
green or red, an overload condition may exist.
12. Install additional power supply modules.
13. Check power supply modules that had blinking green or
red LEDs. If they are still blinking green or red, they have
failed. Install a good power module, then remove the faulty
module.
14. If the system status LED is red, bus voltages are good and
there are no red or blinking green LEDs on the power supply
modules, the problem is in the external inputs being monitored
by the bus monitor module.
15. If user external power supply voltages are being monitored
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 3-3 for
jumper settings).
16. If switch settings are okay, measure the voltages between
TB2-1 and TB2-2 or TB2-3 and TB2-4 on the power entry
panel. Voltages should be:
Greater than 22.2 VDC if set for 24 VDC
Greater than 44.2 VDC if set for 48 VDC
If the voltages are correct, there is a problem in one of the aux-
iliary status inputs (STATUS IN) at terminal block TB1 on the
power entry panel.
17. Measure the voltage from terminal 1 and terminal 3 with
respect to terminal 2 of TB1. The voltage measured at these
terminals will depend on how J4 and J5 are set on the bus
monitor module. If J4 and J5 are set for normally open (NO)
status input and the voltage measures greater than 0.7 VDC,
the input status is bad. If J4 and J5 are set for normally closed
(NC) status input and the voltage measures less than 3.5 VDC,
the input status is bad. To verify the external device causing
the bad status, remove the suspect input wire. The SYSTEM
STATUS LED should turn green if the external device was pull-
ing the input low or high.
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