4-1
4. Operation
4.1 Check items before test operation
4.1.1
Check items related to the electrical system
(1) Check that the equipment is correctly wired.
(2) Check that the terminals are securely connected.
(3) Check that the equipment is securely grounded.
(4) Check that the setup value of the overload protection device is consistent with the rated current
value of the motor.
Warning
Do not use the product at any voltage other than the rated value.
Otherwise, it may lead to a fire or electric shock.
4.1.2 Check items related to the pump
Caution
Do not allow a large amount of foreign matter from entering the pump.
Otherwise, it may damage the sliding parts (e.g. bearings, mechanical
seal) inside the pump, or lead to leakage or unusual noise.
(1) For the model VKN-e, be sure to prime the pump when you
start up the model for the first time after installation or when
you run the model after long periods of shutdown. The
priming must be carried out from the discharge side until air
inside the pump is completely removed (until no air comes
out of the end of the suction pipe). Running the system with
incomplete priming may make it impossible to pump up the
liquid or damage the shaft sealing device. Note that if the
length (H in the right figure) from the feed port of priming
liquid to the pump discharge port is shorter than the length
(L) of the suction pipe below the liquid level, you may not be
able to fill the pump with liquid completely. In such a case,
provide an air vent port for priming to the suction pipe or set the feed port of priming liquid at a
sufficiently high position.
(2) For the model VKP-e, check that the liquid level in the tank (oil tank) is above
the “Minimum liquid level.”
(3) Check the rotation direction. Normal rotation is counterclockwise when
viewed from the motor side. (See the right figure.)
(4) Rotate the main shaft by hand to check smooth rotation. To rotate the shaft by
hand, insert a flat-blade screwdriver through the fan cover of the motor and
turn its shaft. If the rotation is stiff or not uniform, there may be some rust or
foreign matter inside the pump. Inspect the pump in such a case.
Caution
During test operation, never run the pump dry (i.e. running the
pump when the liquid level is below the Minimum liquid level).
During normal operation, do not run the pump dry for more than
30 seconds. Otherwise, it may seize up the sliding parts (e.g.
bearings, mechanical seal) inside the pump.
Rotation direction
Joint
Once the priming is complete,
plug the joint before operation.
Liquid level
Suction pipe
Discharge
pipe
