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3
EN-3P LIQUID LEVEL CONTROL RELAY
NO
C
NC
PL
PH
T1
F/D
T3
PC
T2
RELAY
LINE
L
H
SENSITIVITY
75K
100K
5K
50K
25K
LED Indicators
LINE:
Supply voltage connected.
Relay:
Output relay is closed.
H:
The high probe (PH) is
submerged in the liquid.
L:
The low probe (PL) is
submerged in the liquid.
Typical example of connection
C NC
N O
P H P L
P C
T 1
L 1
L 2
T 2 T 3 F / D
L 1
C B
L 2
PUMP
DIRECT OPERATION WITHOUT AN EXTERNAL STARTER
Only for single phase pumps
220 VCA
C
NC
N O
P H P L
P C
PUMP
T1 T2 T3 F/D
OPERATION WITH A STARTER
OL
CB
OL
OL
SW
L1
L1
L3
L1
L3
L3
L2
OL
M
M
M
M
220 V
AC
M
= Contactor
= Overload Relay
OL
SW
= Switch
CB
= Circuit Breaker
1)
Use cable size 12 to 18 AWG to wire the probes.
2)
Use 3 different cable colors to prevent a mixup with the
probes.
3)
The probe PC should not be more than 8 inches below
from probe PL.
4)
The probe PH should not be more than 48 feet higher
than probe PL.
Probe installation
PC
PL
PH
PROBE CABLES
PROBE
CABLE
BRONCE
PROBE
TIGHTENING
SCREW
HIGH
PROBE
LOW
PROBE
COMMON
PROBE
Install the probes in the liquid deposit. If the probes
aren’t submerged in the liquid and their LED
indicators are turned ON, then increase the sensitivity
level until they are turned OFF.
Submerge the probes in the liquid and check if their
LED indicators are turned ON. If the probe LED
indicators aren’t turned ON, decrease the sensitivity
level until they are.
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