Troubleshooting - KNF NF 1.100 EX Operating And Installation Instructions

Diaphragm liquid pump NF 1.100 EX
Pump does not work
Possible cause
Pump not connected to mains
power supply.
Power supply is not switched
on.
Connections or hoses are
blocked.
External valve is closed or filter
is clogged.
Diaphragm, valve plates or
seals are worn
Pump is not priming
Possible cause
Suction side of pump not con-
nected.
Liquid in the container is too
low.
Hose connections are not leak-
tight.
System valve is closed or filter
is clogged.
Pump head is filled with gas.
The system is unable to handle
the pressure on the pressure
side.
Particles in the pump.
KNF Flodos AG BA_NF1.100EX_EN_05_152147
English translation of original Operating and Installation Instructions
9.

Troubleshooting

Improper repairs and changes to explosion protected
machines can create a danger of explosion.
➔ Observe national and international regulations
regarding electrical equipment whenever per-
WARNING
forming servicing and repairs.
➔ Any work that could affect the explosion protec-
tion must be completed by the manufacturer.
These tasks include, for example, repairing the
stator or rotor coil, repairs to the terminals, and
repairs on the ventilation system.
Risk of electric shock, danger of death
➔ Disconnect the pump from the power supply
before working on the pump.
DANGER
➔ Make sure that the pump is de-energised.
➔ When troubleshooting, also observe the Operating and Instal-
lation Instructions for the drive motor.
Fault remedy
➔ Connect pump to mains supply.
➔ Switch on power supply.
➔ Check connections and hoses.
➔ Remove blockage.
➔ Check external valves and filters.
➔ Replace diaphragm, anchor valves and seals
(see Section 8.3).
Tab. 17
Fault remedy
➔ Connect the suction side of the pump.
➔ Fill container.
➔ Secure transition joints between hose and connections with
clamps or clamping elements.
➔ Open the peripheral valve.
➔ Clean filter.
➔ Reduce pressure at pressure side.
➔ Clean the pump head (see Section 8.2).
Troubleshooting
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