EBARA DSC4 - Manual (Page 13)

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INSTRUCTION MANUAL Model DSC4
CAUTION: SINCE THE STARTING TORQUE ON LARGE PUMPS CAN BE POWERFUL,
THE PUMP MUST BE SUPPORTED.
DANGER: DURING CHECKING THE DIRECTION OF ROTATION, DO NOT TOUCH
ROTATING PARTS OF THE PUMP. KEEP HANDS, HAIR AND TOOLS AWAY FROM ROTATING
PARTS TO PREVENT SERIOUS ACCIDENTS.
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 fl ow 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 fi nd the cause of these problems.
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INSTRUCTION MANUAL Model DSC4
3.7 Pump Installation (Fig. 12)
WARNING: WHEN LIFTING THE PUMP, USE APPROPRIATE CRANE (OR HOIST) AND
LIFT SYSTEM.
CHECK POSITION AND TIGHTNESS OF LIFT SYSTEM SO THAT WEIGHT OF THE PUMP IS NOT
UNBALANCED.
FAILURE TO OBSERVE THIS PRECAUTION CAN RESULT IN SERIOUS ACCIDENTES.
After the pump has been thoroughly checked to verify that it is in order, lift the pump body and
fi t the sliding guide of the pump body to the guide pipe. Then, lower the pump body slowly
along the pump guide.
The pump is automatically connected to the discharge elbow.
If the pump cannot be slid down smoothly, the guide pipe may not be vertical or the lifting
method may be wrong. Check these points to determine the cause for correction.
After the pump is installed attach the chain to the hook of the fl oor frame.
When the pump is installed indoors, it should be a good idea for convenience’s sake that a
hoist, for example, be provide on the ceiling so that it can be moved to the pump lifting center
when necessary.
GUIDE PIPE
CHAIN HOOK
DISCHARGE ELBOW
SLIDING GUIDE
Fig. 12