KNF N920 AP.18, Руководство по эксплуатации

Страница: 26 / 32

Troubleshooting Diaphragm Vacuum Pumps N 920__.18 and N 920 KT.29.18G
26 Translation of original Operating Instructions, English, KNF 121416-121419 07/18
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause Fault remedy
Replaced diaphragms and valve
plates

Check that the spacers have been replaced onto the dia-
phragm screw thread.

Check head connection and hose connections for leaks.

Possibly carefully tighten the screws of the head cover
crosswise.
Gas ballast still open.

Close gas ballast.
Tab. 11
Pump is switched on, but does not run, the on/off-switch on the pump is not lit
Cause Fault remedy
Pump is not connected with the
power source.

Connect pump to mains power.
No voltage in the power source

Check room fuse and switch on if necessary.
The pump’s overcurrent protec-
tion circuit has responded.

Remove the pump from the source of electrical power.

Determine and eliminate the cause of the overcurrent (e.g.
inproper pressure, liquid in the pump heads).
The pump must be unplugged for some seconds before the
electronics will allow to restart.
Tab. 12
Pump is switched on, but does not run, the on/off-switch on the pump is lit
Cause Cause
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 elimate it.
Tab. 13
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the ad-
dress).
1. Flush the pump to free the pump head of dangerous or ag-
gressive gases (see chapter 8.2.1).
2. Clean the pump (see chapter 8.2.2).
3. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.