KNF N 813.3 AN.29DC-B, Translation Of Original Operating And Installation Instructions

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Troubleshooting Diaphragm Vacuum Pumps N 813
34 Translation of original Operating and Installation Instructions, english, KNF 121240-121506 09/19
9. Troubleshooting
DANGER
Risk of electric shock, danger of death!
➔
Disconnect the pump power supply before working
on the pump.
➔
Make sure the pump is de-energized and secure.
➔
Check the pump (see Tab. 14 and 15).
Pump does not work
Cause Fault remedy
Pump not connected to the
mains.
➔
Connect pump to the mains.
No voltage in the mains.
➔
Check room fuse and switch on if necessary.
For pumps with brushless DC
motor:
▪ The motor board’s overcur-
rent protection circuit has
activated.
▪
Maximum temperature of
motor board is exceeded
▪
Maximum blocking time of
the rotor is exceeded
➔
Separate pump from the mains.
➔
Determine and remove the cause of the overcurrent (for
example: improper pressure, liquid in the pump heads).
The pump must be separated from the mains for several
seconds before the electronics will permit restarting.
For pumps with brushless DC
motor:
Wrong polarity of the connection
wires
➔
Separate pump from the mains.
➔
Be aware of right polarity of the connection wires and
connect pump.
For pumps with AC motor:
The pump's thermal switch
has triggered.
➔
Disconnect pump from the mains.
➔
Allow pump to cool.
➔
Identify and eliminate cause of overheating.
Connections or hoses are
blocked.
➔
Check hoses and connections.
➔
Remove blockage.
External valve is closed or
filter is clogged.
➔
Check external valves and filters.
Condensate has collected in
the pump head.
➔
Detach the condensate source from the pump.
➔
Flush the pump (see Chapter 8.2.1).
➔
Install the pump at the highest point in the system.
Diaphragm or valve plates
are worn.
➔
Replace diaphragm and valve plates (see Chapter 8.3).
Tab. 14