KNF LABOPORT N820.3FT.29.18G, Manual

Page: 103 / 333

Troubleshooting
Chemically-resistant Laboratory pump N820.18
EX
48
Translation of Original Operating Instruction, English, KNF
317428-317425 09/20
Flow rate, pressure or vacuum too low
The pump does not reach the output stated in the technical data or data
sheet.
Cause Fault remedy
Replaced diaphragm
and valve plates/seals.
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.
Rotary/push knob is
not set to max. speed.
à
Set the rotary/push knob to max. speed.
Gas ballast still open.
à
Connect the gas ballast.
Tab.22: Troubleshooting: Flow rate, pressure or vacuum too low
Pump is switched on and not running; status display is not illuminated
Cause Fault remedy
Pump is not connected
to the electrical mains.
à
Connect the pump to the electrical mains.
No voltage in the elec-
trical 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
Pump is switched on and not running; status display flashes red (50% ON,
50% OFF)
Cause Fault remedy
Pump has overheated,
overtemperature pro-
tection has tripped.
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