Technical information

PLC C
ONTROL
ALARM
CONDITIONS
Alarm
Pump Overload
alarm
Possible cause
Overload set incorrectly.
Low supply voltage.
Faulty contactor
Faulty overload module.
Control voltage is incor-
rect.
Solution
Check table on wiring diagram
for correct full load amperage
(FLA) draw. Adjust overload
accordingly.
o Check supply voltage.
Supply voltage to contactor
should be +- 10% of name-
plate voltage.
o Check wire terminations
and connections. Tighten if
loose.
Check line and load side of
contactor. It should be less
than 5 volt drop across the
contactor. If it is not, replace
the contactor. See Replacing
the Contactor 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.
Check 24VDC required for
contactor auxiliary input. If
control voltage is OK replace
PLC.
UGH024/1103 Portable Chillers
TROUBLESHOOTING
6-33