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A
LARM
C
ONDITIONS
Series 1 Portable Chillers, PLC Control
UGH017/0500
6-12
T
ROUBLESHOOTING
Alarm
ALM 05
Compressor
Overload alarm
Possible cause
Overload set incorrectly.
Low supply voltage.
Faulty contactor
Faulty overload module.
S
OLUTION
Check table on wiring diagram
for correct full load amperage
draw. Adjust overload accord-
ingly.
❏
Check supply voltage.
Supply voltage to contactor
should be +- 10% of name-
plate voltage.
❏
Check wire terminations
and connections. Tighten if
loose.
Check line and load side of
contactor. There should be less
than a 5 volt drop across the
contactor. If there is not,
replace the contactor. See
Replacing the Contacto
r in the
Troubleshooting section.
Check amp draw of circuit. If
it is under the rated setting,
replace the overload module.
See
Replacing Overload
Modules
, in the
Troubleshooting section.