Troubleshooting
February 2011 6-2 P/N 06-237041-001
Table 6-1. General System Events
General System Events
Error Message Probable Cause Corrective Action
AC INPUT FAULT On Loss or degradation of primary power
from commercial light and power
company. Message will appear if AC
supply voltage drops to 85% or less of
the normal operating voltage.
Accompanied by message "System
Changed Over to Battery Power" if
standby battery used.
WARNING
:
If AC power is lost on any PMU Board of
a FenwalNET 8000-ML system
containing multiple PSU/PMU Board
assemblies, the system will immediately
stop charging standby batteries and the
batteries will supply the load of all PMU
Boards that are in the Trouble state.
The system should be serviced
immediately to restore AC power.
• Notify commercial light and power
company of loss of service.
• Check connections to Power Management
Unit (PMU) Board TB1. Use voltmeter to
check for nominal 120/240 Vac at TB1.
• Remove secondary and primary power.
Label and disconnect all field wiring.
CAUTION
:
Disconnect all electrical control heads
and short together and tape wiring to
initiators (if applicable)
• Ensure AC Selector Switch on power
supply unit is correctly set for line voltage.
Refer to Figure 2-4
• Re-install printed-circuit board, connect
field wiring, and apply primary and
secondary power if incorrect AC Selector-
Switch setting. Perform functional tests as
necessary
BATTERY CHARGER FAULT On Failure of the battery-charging circuitry • Check battery connections to Power
Management Unit (PMU) Board J10. Refer
to Figure 2-9.
• Disconnect battery leads from Power
Management Unit (PMU) Board J10 and
use digital volt-ohm meter to measure
battery open-circuit voltage. Replace
batteries if open-circuit voltage is less than
22 Vdc.
• Replace the fuse on the PMU Board if
blown. See Figure 1-10.
• Replace the power supply unit. See
Figure 1-9
• Replace Power Management Unit, PMU.
See Section 2-4.4.
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