Fault Finding The Product 20 Caution - Grundfos SRG.10.30.606 Montage- Und Betriebsanleitung

8. Fault finding the product
Warning
Before starting any work on the pump,
make sure that the fuses have been
removed or the mains switch has been
switched to off. Make sure that the power
supply cannot be accidentally switched on.
All rotating parts must 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.
20
Cause
a) No power supply or supply failure. Call an electrician.
b) Power supply cable is faulty.
c) Control system is faulty.
d) Impeller cannot rotate freely.
e) Stator windings are faulty.
f) Motor has cut out because of
overheating.
g) Different phase voltages.
h) Overload relay is set too low or is
faulty.
i) Leak sensor has cut out the pump. Contact Grundfos.
j) Humidity in motor.
a) Stator windings are faulty.
b) Different phase voltages.
c) Overload relay is set too low or is
faulty.
d) Leak sensor has cut out the pump. Contact Grundfos.
e) Humidity in motor.
a) Impeller rotates in the wrong
direction.
b) Pump runs on two phases.
c) Internal parts are worn.
d) Impeller dirty or damaged.
a) Internal parts are worn.
b) Impeller dirty or damaged.
c) Faulty motor or gearbox roller
bearings.
d) Oscillations caused by the
installation (resonance).
Remedy
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
4.5.3 Overload relays.
Contact Grundfos.
Contact Grundfos.
Call an electrician.
Check the overload relay. Set the relay to
the rated current. See section
4.5.3 Overload relays.
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.