Technical information

PLC C
ONTROL
ALARM
CONDITIONS
Alarm
Compressor 2
Overload alarm
Possible cause
Overload set incorrectly.
Low supply voltage.
Faulty contactor
Faulty overload module.
Control voltage is incorrect.
SOLUTION
Check table on wiring diagram for
correct rated load amperage
(RLA) draw. Adjust overload
accordingly.
o Check supply voltage. Supply
voltage to contactor should be
+- 10% of nameplate voltage.
o Check wire terminations and
connections. Tighten if loose.
Check line and load side of con-
tactor. 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 con-
tactor auxiliary input. If control
voltage is OK replace PLC.
UGH024/1103 Portable Chillers
TROUBLESHOOTING
6-43