22
10.8 Troubleshooting Guide
Problem
Possible Causes
Recommended Solutions
System will not start or only operate
a short duration
Main electrical disconnect switch in the
off position.
Place disconnect switch in the on
on position.
The unit start/stop switch is in the
off position.
Press the unit start switch in the
on position.
Fused have failed.
Replace the fuses.
Overload relay has tripped.
Compare FLA rating of the motor to the
overload relay setting, adjust as required
and measure amperage.
Poor wire connections.
Check wire connections at motor and all
wire terminations.
Insufficient airflow
Blower rotation is incorrect.
Check blower rotation per directional
arrow on the blower housing.
Refer to Section 4.1.3.
PSG access door(s) are open.
Check drive belts and motor condition.
PSG has extreme internal contaminant
build up due to poor maintenance.
Close PSG access door(s).
Internal debris within the duct and
or PSG cabinet.
Manually clean the PSG unit.
Refer to Sections 6, 7 and 8.
The power pack enclosure
indicator light is not illuminated
Power pack enclosure toggle switch
is in the off position.
Remove debris.
Power pack enclosure(s) push rod
assembly is not properly adjusted.
Refer to Section 9.5.
Power pack has failed.
Refer to Section 10.4.
The power pack enclosure
indicator light is flashing.
Unicells are not properly electrically
aligned.
Refer to Figure 6.
Unicell(s) have a moderate to extreme
contaminant build up.
Refer to Sections 6, 7 and 8.
High voltage measurements are not
within specifications.
Refer to Section 10.3.
Power pack has failed.
Refer to Section 10.4.
System efficiency is poor.
Smoke is discharging to the atmosphere.
Power pack enclosure(s) toggle switch are in
the off position.
Check power pack enclosure(s) toggle
switch position.
Unicells are not properly electrically aligned.
Refer to Figure 6.
Unicell(s) have a moderate to extreme con-
taminant build up.
Refer to Sections 6, 7 and 8.
Power Pack has failed.
Refer to Section 10.4.
Power pack enclosure(s) push rod
assembly is not properly adjusted.
Refer to Section 9.5.
Fuses have failed to the power pack
circuit.
Replace fuses.
Air volume (ACFM) is not within
specifications.
Measure air volume, call Parker Customer
Service for specifications.
