LG RCWW-1 Operation & Maintenance Manual page 21

Compressor interior protector is equipment for sensing winding wire and discharge temperature of com-
pressor which is installed on compressor. In case that compressor interior protector sense abnormal
high temperature from winding wire and discharge temperature, this signal change from ON to OFF, it is
kept ON in normal temperature condition.
Phase Sequence is Phase sequence voltage watcher which is installed on Power Panel, it watches input
power condition, if it detects abnormality, it change the signal from ON to OFF, if not it is in ON condi-
tion. The kinds of abnormal voltage that Phase Sequence can detect is 5, it includes over voltage, low
voltage, open, short, imbalance of between phase.
Overload is condition of overload relay for compressor, if it is normal it kept ON, if it is abnormal when
over-current flows it changes from ON to OFF.
Cond Pressure is input value of high-pressure switch that detect condenser high-pressure. It would be on in
high pressure abnormal condition, it would be On in normal pressure condition. Evap. Pressure also input
value of low-pressure switch that detects evaporator low-pressure. It would be OFF in evaporator low-pres-
sure abnormal condition, it would be ON in normal pressure condition.
Frosbite Preventer is low temperature detect switch installed on evaporator, and it is used for preventing ice
formation. Low temperature detection would be done by the standard of cold water temperature 2ʼc, it would
be ON in normal temperature and it would be OFF if it is lower than 2ʼc.
Pump contactor input to the field wire is needed, contact part of electron contactor of cold water and cooling
water pump would be inputted to PLC in series. This signal should be ON when pump operation is needed.
Condenser Flow Switch is signal that is inputted into PLC after cold water and cooling water level switch
is connected in series. This signal should be ON when pump operation is needed.
Emergency Protector is the condition of Emergency switch that is installed on control. In case that emer-
gency switch is cancelled, it is kept ON, in case that emergency switch is clicked, it is kept OFF.
Remote Controller is contact part signal input for tele controlling in tele control mode of chiller, when it is
ON, it operates chiller, when it is OFF, it stops chiller.
Output
Indication
Current
M1 Contactor
M2 Contactor
M3 Contactor
Loading Solenoid valve
Unloading
Solenoid valve
Liquid Solenoid valve
Pump Contactor
Alarm Output
Meaning
Operation Current
Main electron contactor
Electron contactor for △ short
Electron contactor for Y short
Control valve for Sliding
Valve
Valve for Economizer
Pump control
Alarm operation
Table 3
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Normal
condition Normal condition
when when operating
stopping
0A Operation Current
ON
OFF → ON
OFF
ON → OFF
OFF
It changes depending on operation
condition.
ON
(100% ON during operation)
OFF
It changes depending on operation condition.
Operation & Maintenance Manual
ON
OFF/ON
ON