TROUBLESHOOTING
TROUBLESHOOTING FLOWCHARTS
I-E96-506B1 5 - 3
4. If the LEDs on both modules are green, check the AC input
line 1 and line 2 LEDs on the AC transfer module.
5. If either of the AC input line LEDs are red, this means a
loss of AC input power, or bad quality. If both LEDs are red,
switch S1 may have been moved when the ATM module was
installed. Check switch setting for 120/240 VAC and set to the
appropriate setting.
6. Verify that the circuit breakers are in the on position.
7. If the circuit breakers are on and the AC input line LEDs
are still red, the power entry panel has failed. Replace the
power entry panel.
8. If all AC transfer module LEDs are green, look at the bus
monitor module LEDs.
9. If the 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. If the system status
LED is green there is no problem.
11. Install additional power modules if the bus voltages mea-
sured in Step 10 are low.
12. If the measurements made in Step 10 are good, check the
power module LEDs. If any LEDs are red, that power module
has failed. Install a good power module before removing the
failed power module.
13. If any power modules have blinking red and green LEDs,
those modules are over temperature. Check the fan assembly
for proper operation. Check the condition of cabinet air filter
and clean or replace if dirty.
14. Check the power modules for blinking green LEDs. Blink-
ing green LEDs indicate an overcurrent condition. Install addi-
tional power modules.
15. If any power module LEDs are blinking red, an undercur-
rent condition may exist because of low 5 or 24 VDC loads on
the system. If the 5 and 24 VDC loads are normal, insert a good
power module then remove the power module with the blinking
red LED.
16. Disable the 5 or 24 VDC undercurrent detection on all
power modules if the system load for those voltages is low.
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