D39489-BA-PM-EN.pdf - 第40页

40 D39489 | Date 12/2019 Troubleshoot ing Diaphragm pump PJ25481 - 950.50.1 8 28 Trans lation of orig inal Instal lation Instructi ons , englis h , KNF 1255 30 - 316634 0 6/18 9. Troubl eshooting DAN G E R Extreme danger…

D39489 | Date 12/2019

Diaphragm pump PJ25481-950.50.18 Servicing

Translation of original Installation Instructions, english, KNF 125530-316634 06/18 27

Final steps

1. Reconnect suction and pressure line on the pump.

2. Reconnect the pump to the mains.

If you have any questions about servicing, call your KNF technical

adviser (contact data: see www.knf.com).

D39489 | Date 12/2019

Troubleshooting Diaphragm pump PJ25481-950.50.18

28 Translation of original Installation Instructions, english, KNF 125530-316634 06/18

9. Troubleshooting

DANGER

Extreme danger from electrical shock!



Disconnect the pump power supply before work-

ing on the pump.



Make sure the pump is de-energized and se-

cure.

 Check the pump (see Tab. 12 and Tab. 13).

Pump does not transfer

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.

 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 ex-

ample: improper pressure, liquid in the pump heads).

The pump must be separated from the mains for several

seconds before the electronics will permit restarting.

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).

Diaphragm or valve plates are

worn.



Replace diaphragm and valve plates (see Chapter 8.3).

Tab. 12

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

Condensate has collected in the

pump head.



Detach the condensate source from the pump.

 Flush the pump (see Chapter 8.2.1).

Presence of positive pressure

on the pressure side with simul-

taneous vacuum or positive

pressure on the suction side.

 Change the pressure conditions.

Cross-section of pneumatic

hoses or connectors too narrow

or restricted.

 Disconnect the pump from system and determine output

values.

 Remove restriction (e.g. valve) if necessary.

 If applicable, use larger-diameter hoses or connectors.

Leaks in connections, hoses or

pump head.

 Make sure the hoses and connections.

 Remove any parts or particles causing blockages.

Pump head components are

soiled.

 Clean head components.

D39489 | Date 12/2019

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.