4-2
Warning
Before rotating the pump shaft by hand to check it, be sure to turn off the
main power. An unexpected start of the pump may cause an accident.
(5) If you run the motor at variable speed with the inverter, be sure to check the following points
through test operations.
·
The pump may produce resonance depending on installation conditions. If the pump
produces resonance, avoid that frequency.
·
If the operation frequency is low or the dynamic viscosity of the pumping liquid is high, the
pump may not discharge any liquid.
·
Do not run the pump at a frequency exceeding 60 Hz. Otherwise, the motor may burn out.
Caution
Do not run the pump at a frequency exceeding 60 Hz. Otherwise, it may
lead to overload and burnout of the motor.
4.2 Running the pump (test operation)
Warning
Be sure to attach the cover of the terminal box of the motor.
Otherwise, it may lead to an electric shock.
Warning
Do not operate the pump if any abnormal condition is observed or if there
is anything wrong with the parts, components, and others during the check
before test operation. Otherwise, it may lead to an injury, failure, accident,
or other problems.
Warning
If you pump a liquid above 40°C, do not touch the pump.
Otherwise, its hot surface may cause burns.
(1) Check the rotation direction of the pump by turning on and off the power switch once or twice.
Normal rotation is counterclockwise when viewed from the motor side.
If the pump rotates in reverse, swap two of the three wires of the power cable.
Caution
Never check the rotation direction by running the pump dry even for a short
time. Otherwise, it may damage the sliding parts (e.g. mechanical seal,
bearings) in the pump, or lead to leakage or unusual noise.
Caution
Do not run the motor in reverse because it may cause a failure.
