KNF N630.12, Translation Of Original Operating And Installation Instructions, Page: 47 / 88

Diaphragm pump N630.12 Troubleshooting
Translation of Original Operating and Installation Instruction, english, KNF 318761-318764 02/22 47
9 Troubleshooting
DANGER
Danger: electric shock can be life-threatening.
à
All work on the pump may only be performed
by an authorized specialist.
à
Before working on the pump: Disconnect the
pump from the power supply.
à
Check and ensure that no voltage is present.
à
Allow the pump to cool before troubleshooting.
à
Check the pump (see following tables).
Pump not delivering
Cause Fault remedy
Pump is not connected to the elec-
trical mains.
à
Connect the pump to electrical power.
No voltage in the electrical mains. à
Check the circuit breaker for the room and switch
it on if necessary.
Pneumatic connections or lines are
blocked.
à
Check the connections and lines.
à
Remove the blockage.
External valve is closed or filter is
clogged.
à
Check external valves and filters.
Condensate has collected in the
pump head.
à
Separate the source of the condensate from the
pump.
à
Flush the pump with air at atmospheric pressure
for a few minutes (if necessary for safety reasons:
with an inert gas).
à
Install the pump at the highest location in the sys-
tem.
Working diaphragm, safety di-
aphragm or valves are worn or de-
fective.
à
Replace the working diaphragm, safety di-
aphragm and valves (see Chapter
8 Servicing ).
Thermal switch or triggering device
for PTC thermistor sensor of the
motor has tripped. à
Disconnect the pump from the electrical mains
network.
à
Let the pump cool down.
à
Determine the cause of the overheating and elim-
inate the cause.
Tab.22