9
◼
Precautions in operation
1. Electric wiring
Before starting operation, check the rotational direction. When U (red), V (white), W (black), and earth
(green) are connected, the pump starts. Checking the rotational direction is as follows.
1-(1) In case of the inverse rotation, the capacity is only 30% of the forward rotation.
1-(2) When turning on the switch with lifting the pump in water, a counterclockwise back action is in
the forward direction.
Note: In case of the inverse rotation, switch two of three cables (Rec, White, Black).
2. Precautions in electric wiring
⚫
Make sure to connect a green earth wire to a polar plate or bar before connecting the cable to
prevent electric shock.
⚫
When it is necessary to be the instantaneous operation to check the rotational direction, never
test the pump in air. Heat makes the pump may deform and causes the failure.
⚫
Install a circuit breaker to prevent unexpected problems.
Note: To prevent electrical shock or fire, the user is obligated to provide a leak breaker
according to the industrial safety and Health Regulation and Electric Equipment Technical
Standard. (Japan)
Red
– U
<Cable side>
White
– V
<Motor cable side>
Black
– W
Green
– Earth
3. Voltage during operation
When the voltage is low, the current increases. In this case, the thermal protector works as the
temperature of the stator is raised. The low voltage causes the performance failure. Use the pump
with the voltage within the specified range.
Note: The applicable voltage for this pump is within
±
10
％
of the rated voltage.
4. Thermal protector (Protection Instrument)
When the temperature of the motor coil is near burning temperature for electrical or mechanical
causes, the burn protection function works and stops the motor by cutting off the electrical circuit. At
this time, carefully check the operated cause of the thermal protector, and remove it before resuming
operation.
Note: Make sure to turn off the power before check. The thermal protector automatically
restart.
Positive rotation
Inverse rotation
