English (GB)
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11. Fault finding
* Applies only to pumps with sensor and with IO 111.
Warning
Before attempting to diagnose any fault, make sure that the fuses have been removed or the mains switch has been
switched off. It must be ensured that the power supply cannot be accidentally switched on.
All rotating parts must have stopped moving.
Warning
All regulations applying to pumps installed in potentially explosive environments must be observed.
It must be ensured that no work is carried out in potentially explosive atmosphere.
Note
For pumps with sensor, start fault finding by checking the status on the IO 111 front panel.
See installation and operating instructions for IO 111.
Fault
Cause
Remedy
1. Motor does not start.
Fuses blow or motor-protective
circuit breaker trips out
immediately.
Caution:
Do not 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) Impeller blocked by impurities.
Clean the impeller.
d) Air bells, float switches or electrodes out of
adjustment or defective.
Readjust or replace the air bells, float switches
or electrodes.
e) Moisture in the stator housing (alarm).
The IO 111 interrupts the supply voltage.*
Replace the O-rings, the shaft seal and moisture
switch.
f)
The WIO sensor is not covered by oil (alarm).
The IO 111 interrupts the supply voltage.*
Check, and possibly replace, the shaft seal, fill
up with oil and reset the IO 111.
g) Stator insulation resistance too low.*
Reset alarm on IO 111, see installation and
operating instructions for IO 111.
2. Pump operates, but motor-
protective circuit breaker trips
out after a short while.
a) Low setting of thermal relay in motor-
protective circuit breaker.
Set the relay in accordance with the
specifications on the nameplate.
b) Increased current consumption due to large
voltage drop.
Measure the voltage between two motor phases.
Tolerance: - 10 %/+ 6 %. Reestablish correct
voltage supply.
c) Impeller blocked by impurities.
Increased current consumption in all three
phases.
Clean the impeller.
d) Wrong direction of rotation.
Check the direction of rotation and possibly
interchange any two of the phases in the
incoming supply cable. See section
3. The thermal switch of the pump
trips out after a short while.
a) Too high liquid temperature.
Reduce the liquid temperature.
b) Too high viscosity of the pumped liquid.
Dilute the pumped liquid.
c) Wrong electrical connection. (If the pump is
star-connected to a delta connection, the
result will be very low undervoltage).
Check and correct the electrical installation.
4. Pump operates at below-
standard performance and
power consumption.
a) Impeller blocked by impurities.
Clean the impeller.
Check the direction of rotation and possibly
interchange any two of the phases in the
incoming supply cable. See section
b) Wrong direction of rotation.
5. Pump operates, but gives no
liquid.
a) Discharge valve closed or blocked.
Check the discharge valve and possibly open
and/or clean it.
b) Non-return valve blocked.
Clean the non-return valve.
c) Air in pump.
Vent the pump.
6. High power consumption
(SLV).
a) Wrong direction of rotation.
Check the direction of rotation and possibly
interchange any two of the phases in the
incoming supply cable. See section
b) Impeller blocked by impurities.
Clean the impeller.
7. Noisy operation and excessive
vibrations (SL1).
a) Wrong direction of rotation.
Check the direction of rotation and possibly
interchange any two of the phases in the
incoming supply cable. See section
b) Impeller blocked by impurities.
Clean the impeller.
8. Pump 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 of
the liquid.
Install a mixer in the tank.
Содержание SL1.100.100.40.4
Страница 1: ...SL1 and SLV pumps 1 1 11 kW 50 Hz Installation and operating instructions GRUNDFOS INSTRUCTIONS...
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Страница 40: ...Appendix 40 SL1 TM04 2778 0904...
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