Fault Finding - Grundfos SRP Instrucciones De Instalación Y Funcionamiento

10. Fault finding

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
1. The pump does not a) No power supply or supply failure.
start.
b) Power cable is faulty.
c) Control system is faulty.
d) Propeller cannot rotate freely.
e) Stator windings are faulty.
f)
g) Different phase voltages.
h) Overload relay is set too low or is faulty.
i)
j)
2. Pump starts, but a) Stator windings are faulty.
stops immediately.
b) Different phase voltages.
c) Overload relay is set too low or is faulty.
d) Leak sensor has cut out the pump.
e) Humidity in motor.
3. No liquid or inade- a) Propeller rotates in the wrong direction.
quate quantity is
b) Pump runs on two phases.
pumped even if the
motor is running.
c) Internal parts are worn.
d) Propeller dirty or damaged.
4. Pump runs unevenly a) Internal parts are worn.
and makes noise.
b) Propeller dirty or damaged.
c) Faulty motor or gearbox roller bearings.
d) Oscillations caused by the installation (resonance).
5. High current and a) Wrong voltage supply or supply failure.
power consumption.
b) Power cable is faulty.
c) Control system is faulty.
d) Propeller cannot rotate freely.
e) Stator windings are faulty.
f)
g) Internal parts are worn.
h) Faulty motor or gearbox roller bearings.
Motor has cut out because of overheating.
Leak sensor has cut out the pump.
Humidity in motor.
Pump runs on two phases.
Remedy
Call an electrician.
Call an electrician.
Call an electrician.
Clean the propeller 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 7.3 Overload relays.
Contact Grundfos.
Contact Grundfos.
Contact Grundfos.
Call an electrician.
Check the overload relay. Set the relay to the
rated current. See section 7.3 Overload relays.
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 propeller and inspect for any wear.
Contact Grundfos.
Clean the propeller and inspect for any wear.
Contact Grundfos.
Check installation design.
Call an electrician.
Call an electrician.
Call an electrician.
Clean the propeller 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.
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