Troubleshooting LABOPORT Pumps and Systems
44 Translation of original Operating Instructions, english, KNF 121211-121345 01/10
Vacuum Controller is switched on and set on "Regulation Mode", the desired vacuum level
is not reached, pump does not run, the on/off-switch on the pump is not lit
Cause Fault remedy
Pump is not switched on.
Switch on pump.
Incorrect electrical connection of
controller
Switch off system and separate from power supply.
Check cabling.
Fuse in the pump is defective.
Remove pump’s mains plug from the socket.
Loosen marked lid on underside of the pump.
Select and replace suitable fuse (see chapter 5.1, page 10).
Tab. 31
Vacuum Controller is switched on and set on "Regulation Mode", the desired vacum level is
not reached, pump does not run, the on/off-switch on the pump is lit
Cause Fault remedy
The thermal switch has opened
due to overheating.
Remove pump’s mains plug from the socket.
Allow pump to cool.
Trace cause of over-heating and eliminate it.
Tab. 32
Vacuum Controller is switched on, no LED-indication
Cause Fault remedy
In the electrical supply unit the
vacuum controller plug is
plugged into the socket for the
pump.
Make sure that the vacuum controller’s mains plug is plugged
into the socket (on the electrical supply unit) for vacuum
controllers (see fig. 10, page 26, position 2).
The fuse in the vacuum control-
ler is defective.
Switch off system and separate from power supply.
Select an appropriate fuse (refer to the vacuum controller’s
operating instructions).
Replace fuse above the circuit closer/circuit breaker.
The fuse in the electrical supply
unit is defect.
Switch off system and separate from power supply.
Select suitable fuse (see chapter 5.2, page 17).
Replace fuse on the front side, below the mains connection.
Tab. 33
Vacuum Controller shows unrealistic values
Cause Fault remedy
The factory-set pressure
equalization has changed.
Contact KNF (see page 47).
Sensor is defective Contact KNF (see page 47).
Tab. 34
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