Landustrie version 06-12 | operation & maintenance manual DWP & DNP-EX series
Subject to modifications
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Trouble shooting:
Make sure the mains are switched off
Only trained and authorized people may
during inspection.
install and maintain the pump.
Make sure the pump will not start
Don’t go near to rotating parts of the pump
unexpectedly.
Observe the local regulations for installation,
maintenance and repair!
Problem:
Possible cause:
Required action:
Checkpoints:
Pomp does not start
No voltage on the terminals
Check power supply
* main switch
* installation switches
* all auxiliary switches
* voltage relay
Check motor protection
* earth leakage relay
* the auxiliary switches
* motor protection relay
* water in oil relais
Check start- and stop signals
* too low level
* obstructed level switches
* engaged emergency stop
* general electrical error
Wrong pump cable connection
Measure cable wires
* check motor phases
Blockage impeller
Check pump and/or impeller
* impeller or pump jamming
Pump does not stop
No stop signal
Check level switches
* level switches
* general electrical error
Wrong start / stop signal
Check level switches
* installation switches
* level switches
* settings level switches
Pump start and stops
Fault in power supply
Check power supply
* main switch
repeatedly
* installation switches
* switch thermal protection
Level control system not stable
Check level switches
* installation switches
* level switches
* settings level switches
Motor overload
Check motor protection
* wrong direction of rotation
* impeller blockage
* motor protection relay
Motor current too high
Supply failure
Check power supply
* voltage monitoring relay
Pump failure
Check pump
* impeller blockage
* medium specific gravity too high
No flow or too low
Jamming or airlock in discharge pipeline
Check discharge pipeline
* wrong direction of rotation
pump capacity
* blockage in discharge
* valves half open or closed
Pump failure
Check pump
* pump draws air
* impeller blockage
* impeller loose or damage
Fault in power supply
Check power supply
* main switch
* installation switches
* switch thermal protection
High level alarm
Pump failure
Check pump
* impeller blockage
* pump draws air
* impeller loose or damage
* damaged bearings
Supply failure
Check power supply
* switch thermal protection
* fuses
* level switches
* settings level switches
If the pump still fails please contact:
