EBARA
CORPORATION
.
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3. Test operation
…
Automatic alternate type pumps (DLJ)
Check automatic alternate operation of pumps No. 1
(DLJ) and pump No. 2 (DLA) as follows (See Fig. 9).
1) When the water level reaches pump No. 1 start level,
pump No. 1 will start and water will be pumped until pump
No. 1 stop water level is reached. At this point the
automatic alternate operation circuit built into pump No. 1
will stop the pump. The water level will now be at pump
No. 2 start level. Pump No. 2 will start and pump water
until its stop water level is reached. The process is
repeated when the water level is again at pump No. 1 start
level.
2) If the water flowing into the water tank exceeds the amount being pumped by pump No. 2 (abnormal
water increase) and the water level rises to pump No. 1 abnormal start water level, pump No. 1 will
start to operate. The two pumps will then be operating simultaneously in parallel operation.
* Check the direction of rotation for each pump using the same measure described in (2) of 2 while
the pump is operating.
3) Once the direction of rotation is verified, gradually open the gate valves to check for abnormal
conditions in pressure, discharge quantity, current value, etc., referring to
８
“Troubleshooting.”
Do not operate the pump with the gate valve fully closed.
4. Operation
After the test operation is completed, the pumps are now ready for operation.
Note
Operate the pump at a discharge rate suitable for the facilities.
(Operation at excessively small or large capacity causes noise and vibration, and
consumes unnecessary power.)
7
Maintenance
Warning
Disassembling, repairing, and modifying the pump shall be done only by a repair
technician.
There is a possibility of electric shock, ignition, or injury caused by abnormal
functioning, break, etc.
Do not attach parts other than EBARA's standard parts, and do not modify
EBARA's standard products. Use of other than the standard parts may result in
electric shock, ignition, or injury caused by abnormal functioning or break, or may
fail to perform normal functioning.
Before entering inspection and repair, cut OFF a power source at a main
disconnect device which is equipped with an operating handle which is lockable in
OFF position. There is a possibility of electric shock and of injury caused by
sudden start of the pump in automatic operation mode.
To stop operation for a certain period, cut OFF the power switch.
Deterioration of insulation may cause electric shock, electric leak, and fire.
If the insulation resistance decreases to 1MΩ or less, cut immediately OFF the
power switch, and request the inspection and repair of the pump to the supplier or
EBARA CORP. There is a possibility of motor burn-out, electric shock, and fire.
Pump
No. 1
stop water
level
Pump No. 2
stop water level
Pump No. 1
abnormal start
water level
Pump No. 2 start
water level
Pump No. 1
start water
level
Fig.9
8