16
8
Failures
8.1
Failure table
WARNING
Take the general safety measures for the installation, maintenance and repair into
consideration.
Problem
Possible cause
Possible solution
Checkpoints
The pump will not start
No voltage on the termi-
nal clamps
Check the power supply
•
Circuit
•
Main switch
•
Hand-0-Aut switch
•
Fuses
Check the motor safety
relay
•
Earth leakage switch
•
Protective relay
•
Motor temperature
•
Water feeler (option)
Check the start signal
•
Medium level
•
Level switching
•
Start-stop change
•
Switch box
Motor failures
Check the motor
•
Insulation test
•
Phase resistance
The pump does not stop
No stop signal
Check level switching
•
Level switching
•
Switch box
Air in the pump housing
Temporarily remove the
pump from the coupling
Pump switching level
The pump starts and stops
quickly after each other
Incorrect start/stop signal
Check the level switches
•
Level switching
•
Adjusting switches
Power supply is unstable
Check the power supply
•
Circuit
•
Undervoltage
•
3-phase available?
•
Adjustment of the
motor protection
•
Fuses
Pump current is too high
Current failure
Check the power supply
•
Fuses
•
Undervoltage
Pump failure
Check the pump
•
Impeller blockage
•
Viscosity of the
medium
The direction of rotation is
incorrect
Reverse the direction of
rotation
The capacity is too high
Increase the counterpres-
sure
