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4.0 TROUBLESHOOTING:
WARNING: THE PS-12/24-8CP POWERPATH CONTAINS VOLTAGES THAT CAN CAUSE DEATH OR
SERIOUS INJURY. ALWAYS OBSERVE PROPER ELECTRICAL SAFETY PRECAUTIONS AND WARNINGS.
Always follow good troubleshooting procedures:
•
When trouble occurs, observe all visual indications and note them.
•
If the problem is obvious or it can be located on the Troubleshooting Table, note it.
•
Press SYS RESET (SW8) and wait 30 seconds check for a trouble indication.
•
Always de-energize the POWERPATH completely (Remove both AC and DC power) repairs.
•
While the POWERPATH is de-energized, perform a visual and hands on check of all terminals and wires to
ensure proper termination.
Trouble
INP1, INP2 LED's do not light in
ALARM.
GND FAULT LED ON
DC LED OFF
AC LED OFF
No audible output in
WHEELOCK SYNC MODE.
Horn, horn strobes, or strobes
do not synchronize.
CLASS "A" circuit is not
functioning properly.
CLASS "B" circuit is not
functioning properly.
OUT1, OUT2, OUT3, OUT4
LED's on during standby.
P84515 E
Table 4: Troubleshooting
Cause
No input signal on terminals
IN1+IN1-, IN2+IN2-.
GND FAULT
No DC output.
No AC power.
No input to IN2+,IN2-.
Improper MODE selection
Improper appliances.
Improper MODE selection or
SW9 settings.
Improper MODE selection or
SW9 settings.
Trouble on output.
Action
Check input and input wiring.
Check output circuits.
Check wiring to AC power source.
Check AC power source.
See Example 13 and 14 for proper
input connections.
Check MODE selection.
Check appliances to ensure proper
type
for
synchronization.
IN>OUT
MODE
check
appliance (DSM, SM or PS-12/24-
8MP or PS-12/24-8CP).
Check
to
be
certain
selection is identical for each Class
"A" output circuit. Class "A" OUT1
uses outputs 1 and 3. Class "A"
OUT2 uses outputs 2 and 4.
Check SW9 POS 1 and POS 2 on
board for "ON" position.
Check SW9 POS 1 and POS 2 on
board for "OFF" position.
Check output supervision voltage.
Check output EOLR.
For
input
MODE
Sheet 21 of 23
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