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Electrical Circuit Diagrams
LB-1500
Capacitor-Start models, single-phase motor
LBT-1500
Direct-on-Line models, three-phase motor
1φ 100-120V
1φ 200-240V
Protector
Black
Ground
Red(Brown)
White(Blue)
Black
Green
(Green/Yellow)
Green/Yellow
Frame
Grounding
Capacitor
Centrifugal
Switch
Main
Coil
Aux.
Coil
L1
L2
Protector
Black
3
2
1
1
Ground
Red(Brown)
White(Blue)
Black
Green
(Green/Yellow)
Green/Yellow
Frame
Grounding
Capacitor
Centrifugal
Switch
Main
Coil
Aux.
Coil
L1
L2
Red(Brown)
Black
Black
White(Blue or Grey)
Black(Black)
Black
Green(Green/Yellow)
Green/Yellow
Frame
Grounding
Ground
Circle Thermal
Protector
Coil
Coil
Coil
Heater
Heater
U
V
W
Motor Protector
The pump is equipped with a built-in motor protector (circle thermal protector).
If a current overload or overheating occurs under the symptoms given below, the pump
will stop automatically to protect the motor regardless of the water level at the time of
operation.
• Extreme fluctuation of power supply voltage
• Pump operated under overload condition
• Pump operated at open phase or binding condition
Note:
After the motor protector has tripped, the motor automatically resumes its operation.
Therefore, make sure to disconnect the cabtyre cable from the terminal board or the power
outlet, and eliminate the cause of the problem.
Do not operate the pump at unusually low head, or with the impeller clogged with debris.
Doing so will not only prevent the pump from attaining its full potential, but may also gen-
erate abnormal noise and vibration and damage the pump.
