KNF N1200.12, Original Operating And Installation Instructions, Page: 36 / 60

Troubleshooting Diaphragm Pump N1200.12, N1400.1.2.12
36 Translation of Original operating and installation instruction, English, KNF 308930-308933 02/22
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
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.
There is overpressure on the pres-
sure side and at the same time
vacuum or pressure above atmo-
spheric pressure on the suction
side.
à
Change the pneumatic conditions.
Pneumatic lines or connection
parts have insufficient cross-sec-
tions or are throttled. à
Disconnect the pump from the system to deter-
mine the output values.
à
Eliminate any throttling (e.g., valve) if necessary.
à
Use lines or connection parts with a larger cross
section if necessary.
Leaks occur at pneumatic connec-
tions, lines or pump head.
à
Eliminate the leaks.
Pneumatic connections or lines are
completely or partially clogged. à
Check the pneumatic connections and lines.
à
Remove any parts and particles that are causing
blockages.
Head parts are soiled.
à
Clean the head components.
Operating diaphragm broken
à
Stop the pump immediately.
à
Check whether the pressure has changed in the
monitored innerspace between working di-
aphragm and safety diaphragm. Replace working
diaphragm and safety diaphragm prior to further
operation of the pump (see
8 Servicing ).
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 ).
Tab.19
Pump exhibiting changed running noises and vibrations.
Cause Fault remedy
Pump bearing worn or defective.
à
Determine the cause.
à
Contact KNF Customer Service.
Drive worn or defective.
à
See operating instructions for drive.
Tab.20