LG RCWW-1 Operation & Maintenance Manual page 60

Voltage monitoring relay monitors 5 abnormal condition of the power. Abnormal conditions include
over-voltage, under-voltage, reverse phase, phase loss and voltage unbalance. Of the abnormal
conditions, reverse phase and voltage unbalance are selectively protected. The rest are mandatory.
In case of an abnormal condition, the abnormal condition type and the abnormal value are shown on
the normal display. Partial abnormal conditions are shown below as examples.
The DIP switch can be configured in 4 ways based on the selective protection and initialization
method. Function of DIP switch is shown below. Based on the default setting, only the switch locat-
ed on ʻ5S/1Sʼ will be turned OFF and the rest ON. Do not change the initial setting to keep the pro-
tection.
REV.
UNBAL.
AUTO
5S/1S
Chiller Water-cooled Screw
OVER VOLTAGE
R
V
S
S
T
UNDER VOLTAGE
R
V
S
S
T
PHASE LOSS
R
V
S
S
T
Rated electrical input : 380VAC
Fig. 35
UNBAL.
REV.
OFF
Protect reverse phase
ON
Do not protect reverse phase
OFF
Protect imbalance
ON
Do not protect imbalance
OFF
Auto initialization
ON
Manual initialization
OFF
Auto initialization delay 5 seconds
ON
Auto initialization delay 1 second
OFF
Table 21
- 60 -
REVERSE PHASE
R
V
S
S
T
UNBALANCE VOLTAGE
R
V
S
S
T
NO INPUT
R
V
S
S
T
AUTO
5S
1S