OEC DAB BD-750, Инструкция по установке, эксплуатации и обслуживанию

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pg. 12
14 Troubleshooting
Before taking any troubleshooting action, disconnect the pump from the power
supply. If there is any damage to the power cable or pump, all necessary repairs or
replacements must be performed by the manufacturer or his authorized customer
support service or an equally qualified party with the manufacturer’s permission.
FAULT CHECKS (possible cause) REMEDY
1. The motor does
not start and
makes no noise.
A. Check the electric connections.
B. Check that the motor is live and that the
mains voltage corresponds to the voltage
on the data plate.
C. Check the protection fuses.
C. If they are burnt-out, change them.
N.B. If the fault is repeated
immediately this
means that the motor is short
circuiting.
2. The pump does
not deliver.
A. The suction filter or the pipes are blocked.
B. The impellers are worn or blocked.
C. The check valve, if installed on the delivery
pipe, is blocked in closed position.
D. The fluid level is too low. On starting, the
water level must be higher than the filter level.
E. The head required is higher than the pump’s
characteristics. A. Remove the obstructions, as
indicated in the chapter on Warnings
(Paragraph 6.4.).
B. Change the impellers or remove the
obstruction.
C. Check good operation of the valve
and replace it if necessary.
3. The motor turns
with difficulty.
A. Check the voltage which may be
insufficient.
B. Check whether any moving parts are
scraping against fixed parts.
B. See Section 7.3
4. The pump does
not deliver.
A. Check that the suction filter is not partially
clogged in PULSAR pumps.
B. Ensure that the impellers or the delivery pipe
are not partly blocked or fouled with scale.
C. Ensure that the impellers are not worn.
D. Ensure that the check valve (if fitted) is not
partly clogged.
A. Remove any obstructions, as
indicated in the chapter on Warnings
(Paragraph 6.5.).
B. Remove any obstructions.
C. Change the impellers.
D. Accurately clean the check valve.
5. The overload
protection device
stops the pump.
A. Ensure that the fluid to be pumped is not too
dense because it would cause overheating of
the motor.
B. Ensure that the water temperature is not too
high (see liquid temperature range).
C. The pump is partly blocked by impurities.
D. The pump is mechanically blocked.
C. Accurately clean the pump.
D. Check for the occurrence of rubbing
between moving and fixed parts;