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4.0 TROUBLESHOOTING
WARNING: THE PS-12/24-8 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.
•
Always de-energize the POWERPATH completely (Remove both AC and DC power) before making changes to switch
settings or repairs.
NOTE: Changes in switch settings will not take affect until all power is removed and then restored to the POWERPATH.
•
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
INP1, INP2 LED's Flashing
OUT1,OUT2,OUT3,OUT4 LED's
do not light in ALARM
FAULT LED Flashing
AC LED OFF
DC LED OFF
AC FAIL relay energizes
(indication in remote location)
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
BAT FAIL relay does not change
state within 5 minutes.
P83862 M
Table 4: Troubleshooting
Cause
No input signal on terminals
IN1+IN1-, IN2+IN2-
Trouble on input
No output
INP1 INP2 trouble
OUT1,OUT2,OUT3,OUT4
Trouble
C "FAULT" NC terminals
OPEN
No AC power input
No DC output
No AC power
No input to IN2+,IN2-
Improper MODE selection
Improper appliances
Improper MODE selection or
SW1/SW2 setting
Improper MODE selection or
SW1/SW2 setting
Power Supply voltage
improperly set.
Action
Check input and input wiring.
Check input supervision Voltage.
Check input EOLR.
Check INPUT SELECT DIP Switch on
corresponding OUTPUT DIP Switch.
Check inputs. (If LED's INP1 or INP2
flashing.)
Check outputs (if LED's OUT1, OUT2,
OUT3, OUT4 flashing).
Check circuit connected to C "FAULT"
NC terminals.
Check AC Power Source.
Check wiring to the battery.
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.
For IN>OUT
MODE check input appliance (DSM,
SM or PS-12/24-8).
Check to be certain MODE 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 SW1 and SW2 on Logic Board
for "CLOSED" position.
Check for proper MODE selection.
Check SW1 and SW2 on Logic Board
for "OPEN" position.
Set Potentiometer on Power Supply
Board
to
28.0VDC
for
applications and 14.0VDC for 12VDC
applications.
24VDC
Sheet 21 of 23
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