4-2
(5) Open the air vent valve to release air. After the air release, close the air vent valve. If the air
vent valve is not installed, open the valve of discharge pipe to release the air.
(6) If you run the pump while changing the speed with the inverter, check the following points
through trial runs without fail.
• The pump may vibrate sympathetically depending on installation conditions. If the pump vibrates
sympathetically, avoid that frequency.
• If the operation frequency is low or the dynamic viscosity of the liquid is high, the pump may
discharge no liquid.
• Do not use the pump with a frequency beyond 60 Hz. Failure to observe this may cause the
motor to burn out.
Caution
Do not allow the pump to operate with a frequency beyond 60 Hz.
Doing so may overload the motor, causing it to burn out.
4.2 Running the pump (test operation)
Warning
Be sure to install the cover of the terminal box of the motor.
Failure to observe this may cause an electric shock.
Warning
Be sure to keep the side plates installed during operation of the pump.
Failure to observe this may cause an injury.
Warning
If you find an abnormality in the check prior to test operation, do not run the
pump with parts etc. under abnormal conditions. Failure to observe this
may cause an injury, failure, accident, etc.
Warning
When the liquid used exceeds 40°C, do not touch the pump.
Failure to observe this may cause the operator to suffer a burn due to high
temperature of the pump.
Warning
Do not touch the motor during operation or immediately after the stop of
operation.
Failure to observe this may cause the operator to suffer a burn due to high
temperature of the pump.
(1) Check the rotational direction of the pump by turning on and off the power switch once or twice.
Normal rotational direction is counterclockwise rotation when viewed from the motor side.
If the pump rotates reversely, replace two of the three wires of the power cable.
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