Diaphragm pump PJ25481-950.50.18
Troubleshooting
Translation of original Installation Instructions, english, KNF 125530-316634 06/18
29
Pump head components are
soiled.
Clean head components.
Diaphragm or valves plates are
worn.
Replace diaphragm and valve plates (see Chapter 8.3).
Diaphragm and valve plates
have been replaced.
Make sure that the shim rings have been replaced onto the
diaphragm screw thread.
Check head connection and hose connections for leaks.
Tab. 13
Fault visualization on motor controller
The excess of the overcurrent limit, the excess of the maximum
temperature of the motor board or the blocking of the rotor is
shown as a fault. A red LED on the BLDC motor controller signals
the cause of the fault.
Optional settings:
If desired, the motor controller can be programmed so that the er-
ror output voltage exhibits the same characteristics as the LED.
With factory settings, only 1 or 0 are logically outputted as voltage
at the fault output.
Fig. 11: LED blinking duration according to different faults
To delete the error condition the motor has to be disconnected
from the mains.
Fault cannot be rectified
If you are unable to identify the cause of the problem, please send
the pump to KNF customer services (contact data: see
www.knf.com).
1. Flush the pump (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.
