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Chiller Water-cooled Screw
Indication value and meaning of input display, and normal value is specified above in the table.
Especially when operating if value is inputted other than the value specified above, PLC judge the wrong
value and alarm generated which would stop the chiller.
M3 contractor of input value is electron contactor of Y short of compressor motor and it would be change
to OFF after ON about for 5 seconds in the beginning of the compressor operation. After M3 Contactor is
Off, compressor would be operated normally through that M2 Contactor , which is electron contactor for
△
short. M1 contactor would be kept ON during operation as Main contactor for power approval.
Oil Flow and Oil Pressure Differential input would be inputted for checking normal function of lubrication
with Oil Level during operation. Oil level input always keeps being on during operation and stop which is
input for getting the oil level of oil separator. Oil Flow switch monitors actual oil flow from oil separator to
compressor, Oil Pressure differential is input for checking the pressure difference between low pressure
refrigerant and high pressure of compressor which is power for making oil flow, both inputs are ON when
compressor operation is stabilized. Therefore it check if it powers on normally in 5 minutes of compres-
sor operation and it judge if it operates alarm. If it is not ON in 5 minutes of compressor operation, PLC
may recognize it alarm and stop the chiller safely.
Delay time is changeable through Parameter Setting, and contact LGE service agent when change is
needed because of alarm operation.
Table 2
Normal
Indication
Meaning
condition Normal
condition
when when
operating
stopping
M1 Contactor
Main electron contactor
ON
ON
M2 Contactor
Electron contactor for
△
short
OFF
OFF
→
ON
M3 Contactor
Electron contactor for Y short
OFF
ON
→
OFF
Oil Flow
Oil flow switch
OFF
ON
(in 5 minutes of operation)
Oil Level
Oil Level switch
ON
ON
Oil Pressure Differential
Oil Pressure differential switch
OFF
ON
(in 5 minutes of operation)
Interior Protector
Compressor interior protector
ON
ON
Phase Sequence
Phase sequence voltage watcher
ON
ON
Overload
Overload relay
ON
ON
Cond Pressure
Condenser high-voltage switch
ON
ON
Evap pressure
Evaporator low-voltage switch
ON
ON
Frosbite Preventer
Freezing Preventer
ON
ON
Pump Contactor
Pump operation input interlock
OFF
ON
Condenser Flow Switch
Cold water/cooling water level switch
OFF
ON
Emergency Protector
Emergency stop switch
ON
ON
Remote Controller
Tele operation signal contact part
ON/OFF
ON/OFF
Input
Содержание RCWW-1
Страница 14: ... 14 Chiller Water cooled Screw User Setting Fig 5 ...
Страница 16: ... 16 Chiller Water cooled Screw Function Setting Fig 6 ...
Страница 18: ... 18 Chiller Water cooled Screw I O Display ...
Страница 23: ... 23 Operation Maintenance Manual Running Information Fig 8 ...
Страница 77: ......
