LG RCWW Operation & Maintenance Manual page 72

4. CONTROL SYSTEM
72
Power panel and connecting signal
Signal name Signal type
Chilled water Input
pump interlock
(non-voltage con-
Cooling water tact)
pump interlock
Chilled water Output
pump Start/Stop
(non-voltage con-
Cooling water tact)
pump Start/Stop
Cooling tower fan
Start/Stop
Signals of access to the central monitoring panel
Signal name
Check motor start
Contact point for
(Zero voltage contacts)
signal
For indication of
Start/Stop Contacts (Zero voltage contacts)
Contacts for error
display (Zero voltage contacts)
For indicating re-
mote operation (Zero voltage contacts)
Contacts for alarm
display (Zero voltage contacts)
Meaning
This is an interlock for checking the
operation of an electronic contactor
for starting a pump.
If there is no input signal during the
start, the chiller may not start.
If there is no input signal while the
machine is running, an error may
occur.
Signals to start / stop the fan or
pump. Access this only when you try
to interlock it into the start/stop sig-
nals from the chiller
Signal type
ON when there is start signal input
Output
OFF when there is stop signal input
ON when chiller starts
Output
OFF when chiller stops
Output
ON when there is error in chiller
Output When remote operation mode is se-
lected ON
Output
ON upon an alarm
The status of contacts is monitored in
a power output of DC24V. Make sure
the contact resistance does not go
above 100Ω.
(It must be avoided to mix other
power lines into the same conduit.)
Use this only with a resistance load
of AC250V 0.1A or below.
Meaning
AC250V 0.1A
Use this only within the
limit of resistance load.
Cautions
Cautions