INSTRUCTION MANUAL
P.22
PM32U
5.3 Cautions of Operation
Closed valve operation of the pump is no problem if operating is not prolonged.
Otherwise, the pump not only becomes overheated but also is caused to rattle and
vibrate by backward flow of the liquid at the suction port.
Avoid closed valve operation as much as circumstances allow.
5.4 Operation
(1) Starting
・
Open the valve if provided.
Note :
A pump of lower shut off power than rated horse power may be started with
the valve closed.
In such case, open the valve within 1 minute after motor start.
・
Start motor
CAUTION :
DO NOT START THE MOTOR IF REVERSE FLOW OCCURS.
(2) Stopping
・
Stop motor
Note :
A pump of lower shut off power than rated horse power may be stopped just
after the valve is closed.
5.5 Cautions During Operation
Pay attention to abnormal noise and vibration. If air or foreign matter enters the pump
or if there is a change in the operating point, mis-operation or valve defect in the
discharge lines, abnormal noise and vibration can occur. Pump discharge pressure
can also vary greatly or the current meter of the motor can vary suddenly during
operation.
In such cases, immediately check to find the cause of these problems.
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