Fault Finding The Product - Grundfos SRG Serie Mode D'emploi

9. Fault finding the product

Before starting work on the pump,
– make sure that the fuses have been removed or
the mains switch has been switched off
– make sure that the power supply cannot be
accidentally switched on
– make sure all rotating parts have stopped
moving.
Fault
1. The pump does not start.
2. Pump starts, but stops
immediately.
3. No liquid or inadequate
quantity is pumped even if
the motor is running.
4. Pump runs unevenly and
makes noise.
5. High current and power
consumption.
Cause
a) No power supply or supply failure.
b) The power supply cable is faulty.
c) The control system is faulty.
d) The impeller cannot rotate freely.
e) The stator windings are faulty.
f) The motor has cut out because of
overheating.
g) Different phase voltages.
h) The overload relay is set too low or is faulty.
i) The leak sensor has cut out the pump.
j) There is humidity in the motor.
a) The stator windings are faulty.
b) Different phase voltages.
c) The overload relay is set too low or is faulty.
d) The leak sensor has cut out the pump.
e) There is humidity in the motor.
a) The impeller rotates in the wrong direction.
b) The pump runs on two phases.
c) The internal parts are worn.
d) The impeller is dirty or damaged.
a) The internal parts are worn.
b) The impeller is dirty or damaged.
c) The motor or gearbox roller bearings are
faulty.
d) Oscillations caused by the installation
(resonance).
a) Wrong voltage supply or supply failure.
b) The power supply cable is faulty.
c) The control system is faulty.
d) The impeller cannot rotate freely.
e) The stator windings are faulty.
f) The pump runs on two phases.
g) The internal parts are worn.
h) The motor or gearbox roller bearings are
faulty.
Remedy
Call an electrician.
Call an electrician.
Call an electrician.
Clean the impeller and check manually that it can
rotate freely.
Contact Grundfos.
Wait until the motor has cooled and attempt to restart
the pump.
Call an electrician.
Check the overload relay. Set the relay to the rated
current. See section 5.5.3 Overload
Contact Grundfos.
Contact Grundfos.
Contact Grundfos.
Call an electrician.
Check the overload relay. Set the relay to the rated
current. See section 5.5.3 Overload
Contact Grundfos.
Contact Grundfos.
Interchange two phases of the mains supply.
1. Check the electrical connections.
2. Replace faulty fuses.
3. Call an electrician.
Contact Grundfos.
Clean the impeller and inspect for any wear.
Contact Grundfos.
Clean the impeller and inspect for any wear.
Contact Grundfos.
Check installation design.
Call an electrician.
Call an electrician.
Call an electrician.
Clean the impeller and check manually that it can
rotate freely.
Contact Grundfos.
1. Check the electrical connections.
2. Replace faulty fuses.
3. Call an electrician.
Contact Grundfos.
Contact Grundfos.
relays.
relays.
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