KNF LAB LABOPORT N 820 Mode D'emploi page 103

Troubleshooting
Flow rate, pressure or vacuum too low
The pump does not reach the output stated in the technical data or data
sheet.
Cause
Replaced diaphragm
and valve plates/seals.
Rotary/push knob is
not set to max. speed.
Gas ballast still open.
Pump is switched on and not running; status display is not illuminated
Cause
Pump is not connected
to the electrical mains.
No voltage in the elec-
trical mains.
Pump is switched on and not running; status display flashes red (50% ON,
50% OFF)
Cause
Pump has overheated,
overtemperature pro-
tection has tripped.
48
Chemically-resistant Laboratory pump N820.18
Fault remedy
à
Ensure that shim rings were fitted on the diaphragm
thread.
à
Check the hoses for leaks.
à
If necessary, carefully tighten the outer screws of
the pressure plate crosswise.
à
Set the rotary/push knob to max. speed.
à
Connect the gas ballast.
Tab.22: Troubleshooting: Flow rate, pressure or vacuum too low
Fault remedy
à
Connect the pump to the electrical mains.
à
Check the circuit breaker for the room and switch it
on if necessary.
Tab.23: Troubleshooting: Pump is switched on and not running; sta-
tus display is not illuminated
Fault remedy
à
Pull power cable of the pump out of the socket.
à
Allow the pump to cool.
à
Determine the cause of the overheating and rectify.
Tab.24: Troubleshooting: Pump is switched on but not running; sta-
tus display is flashing red
Translation of Original Operating Instruction, English, KNF
317428-317425 09/20
EX