English (GB)
15
7. Fault finding
DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
For pumps with sensor, start fault finding by checking
the status on the GU01 or GU02 front panel. See
installation and operating instructions for GU01 or
GU02.
Fault
Cause
Remedy
1. The motor does not start,
fuses blow or the motor
protector trips
immediately.
Caution:
Do not try to
start again.
a) Supply failure; short-circuit; earth-leakage fault in
cable or motor winding.
Have the cable and motor checked and repaired
by a qualified electrician.
b) Fuses blow due to use of wrong type of fuse
Fit fuses of the correct type.
c) The impeller is blocked by impurities.
Clean the impeller.
d) An air bell, float switch or electrode is out of
adjustment or defective.
Check the air bells, float switches or electrodes,
and make adjustments or replace or repair the
defective parts, if any.
e) Motor phase malfunction
Inspect the motor and connections.
2. The pump operates, but
the motor protector trips
after a short while.
a) Low setting of thermal relay in the motor protector. Set the relay in accordance with the
specifications on the pump nameplate.
b) Increased current consumption due to large
voltage drop.
Measure the voltage between two motor phases.
Tolerance: - 10 %/+ 6 %.
c) The impeller is blocked by impurities.
Clean the impeller.
d) Wrong direction of rotation.
Check the direction of rotation and possibly
interchange any two phases in the power supply.
3. The thermal switch of the
pump trips after a short
while.
a) Too high liquid temperature. Inadequate cooling.
Improve cooling or lower the liquid temperature.
b) Too high viscosity of the pumped liquid.
Dilute the pumped liquid.
c) Fault in the electrical connection.
(Y-connection of the pump to D-connection results
in considerable undervoltage)
Check and correct the electrical connection.
4. The pump operates at
below-standard
performance and power
consumption.
a) The impeller is blocked by impurities.
Clean the impeller.
b) Wrong direction of rotation.
Check the direction of rotation and possibly
interchange any two phases in the power supply.
5. The pump operates, but
gives no liquid.
a) Air in the pump.
Vent the pump twice.
b) The outlet valve is closed or blocked.
Check the outlet valve and possibly open and/or
clean.
c) The non-return valve is blocked.
Clean the non-return valve.
6. The pump is clogged.
a) The liquid contains large particles.
Select a pump with a larger size of passage.
b) A float layer has formed on the surface.
Install a mixer in the tank.
Содержание DPK
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