Grundfos SRG 60 Hz, Installation And Operating Instructions Manual

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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 Cause Remedy
1. The pump does
not start. a) No power supply or supply failure. Call an electrician.
b) Power supply cable is faulty. Call an electrician.
c) Control system is faulty. Call an electrician.
d) Impeller cannot rotate freely. Clean the impeller and check manually
that it can rotate freely.
e) Stator windings are faulty. Contact Grundfos.
f) Motor has cut out because of
overheating. Wait until the motor has cooled and
attempt to restart the pump.
g) Different phase voltages. Call an electrician.
h) Overload relay is set too low or is
faulty. Check the overload relay. Set the relay to
the rated current. See section
4.5.3 Overload relays .
i) Leak sensor has cut out the pump. Contact Grundfos.
j) Humidity in motor. Contact Grundfos.
2. Pump starts, but
stops immediately. a) Stator windings are faulty. Contact Grundfos.
b) Different phase voltages. Call an electrician.
c) Overload relay is set too low or is
faulty. Check the overload relay. Set the relay to
the rated current. See section
4.5.3 Overload relays .
d) Leak sensor has cut out the pump. Contact Grundfos.
e) Humidity in motor. Contact Grundfos.
3. No liquid or
inadequate
quantity is pumped
even if the motor is
running. a) Impeller rotates in the wrong
direction. Interchange two phases of the mains
supply.
b) Pump runs on two phases. 1. Check the electrical connections.
2. Replace faulty fuses.
3. Call an electrician.
c) Internal parts are worn. Contact Grundfos.
d) Impeller dirty or damaged. Clean the impeller and inspect for any
wear.
4. Pump runs
unevenly and
makes noise. a) Internal parts are worn. Contact Grundfos.
b) Impeller dirty or damaged. Clean the impeller and inspect for any
wear.
c) Faulty motor or gearbox roller
bearings. Contact Grundfos.
d) Oscillations caused by the
installation (resonance). Check installation design.