INTRODUCTION
I-E96-508C
5 - 1
SECTION 5 - TROUBLESHOOTING
INTRODUCTION
The flowchart in Figure
represents basic troubleshooting
procedures. They are not intended to be all encompassing. For
step-by-step details, refer to the supportive text.
TROUBLESHOOTING DC MODULAR POWER SYSTEMS
Most power system problems cause a bad status flag at the
operator interface. This appears as an
S
on the system status
display of an operator interface station or management com-
mand system. Additionally, LED indicators on the bus monitor
and DC transfer modules become red. The LED on the power
supply module will blink green when the five VDC or 24 VDC
circuits overload. It turns red if the 15 VDC circuits overload, if
one or more outputs fail, or if module temperature goes beyond
acceptable levels. Additionally, user alarm outputs are acti-
vated if a low bus voltage or other power system problem
occurs.
Follow the steps below if bad status is detected:
1. Check the LED indicators on the DC transfer and bus mon-
itor modules.
2. If the DC transfer module status LED is red, the module
has failed and must be replaced. A defective DC transfer mod-
ule may cause the bus monitor module to show bad status.
NOTE: Refer to
for details on module removal and
replacement.
3. If the bus monitor module status LED is red, the module
has failed and must be replaced.
4. If both module LEDs are green, check the line 1 and line 2
LEDs on the DC transfer module.
5. If either of these LEDs is red, this means a loss of DC input
power, or bad quality.
6. Verify that the circuit breakers are in the ON position.
7. If circuit breakers are on and the line LEDs are still red, the
power entry panel has failed. Replace the power entry panel.
8. If all DC transfer module LEDs are green, look at the bus
monitor module LEDs.
