Overview Of Faults - Andritz SM Serie Instructions De Service

Series SM
8.4

Overview of faults

The following table shows possible faults in the motor and instructions for remedial action.
To diagnose faults in the pump, please use the manufacturer's operating instructions.
Fault Cause of fault
a) Motor protecting switch
adjusted too low.
1. Motor protecting
switch trips
b) Current consumption of the
motor is too high.
a) Fault in the supply voltage.
2. Pump does not
start
b) Dry running protection has
tripped.
c) Incorrect setting of the
frequency converter / soft-
start device.
3. Pump running
a) Direction of rotation of the
with decreased
motor.
output
22
Error
Wrong value set.
Undervoltage / wrong frequency.
Failure of a phase.
Motor runs sluggishly
(low rpm).
No power supply.
Fuses blown.
Motor cable damaged.
Motor fuse has tripped.
Water level too low.
The motor is not working in the right
operating range.
Wrong direction of rotation.
Rectification
Set the correct value.
Check that the voltage and frequency
correspond to the rating plate.
Check fuse and motor cable for damage.
Check that pump and motor shaft move freely.
Contact your power utility.
Exchange blown fuses. If they blow again, then
the electrical installations and the cable have to
be checked.
Replace defective cable.
Check reason for tripping of the motor
protecting switch and rectify. Reactivate
protective circuit.
Check water level. If the water level is OK,
check dry running protection.
Set motor to the correct operating range.
Change direction of rotation.
Table 3: Faults