Rectifying Transfer Problems - KNF UFK 1.1100 EX Installation Instructions Manual

Symptom
Pump does not
work; no movement
or sounds are de-
tectable.
Pump does not
work; drive be-
comes very hot.
The pump does not
prime, or vacuum is
insufficient.
Pump does not
transfer.
Flow rate is insuffi-
cient or unstable.
Leak on pump head
20

7 Rectifying transfer problems

Cause
No or incorrect control
Motor is controlled with an
incorrect signal.
External valve is closed.
Counterpressure on pres-
sure side is too high.
Particles in the pump head
External valve is closed, or
filter is clogged or too small.
Connections or hoses are
blocked.
Incorrect control
Cross-section of hydraulic
hoses or connectors too
narrow or restricted
Higher counterpressure in
the system than assumed
for the design
Particles in the pump head
Pump has reached the end
of its service life.
Damage to the valve O-
rings
Diaphragm damaged
Resonating diaphragm
damaged
If the malfunction cannot be rectified, contact your local KNF
representative (www.knf.com).
Installation Instructions UFK 1.1100 Ex
Remedy
Check that voltage and signal form comply
with the specification.
Check that voltage and signal form comply
with the specification.
Check external valve.
Change the pressure conditions on the
pressure side.
Rinse the pump head.
Use a preventive preliminary filter.
Check external valves and filter.
Check connections and hoses.
Remove blockage.
Check that voltage and signal form comply
with the specification.
Disconnect the pump from the system and
determine performance data.
Remove restriction (e.g. valve), if neces-
sary.
If applicable, use larger-diameter hoses or
connectors.
Contact KNF representative.
Rinse the pump head.
Use a preventive preliminary filter.
Replace pump head.
Replace the pump.
Replace the O-rings.
Replace the diaphragm.
Replace resonating diaphragm.
KNF Flodos UFK1.1100Ex O&M-Rev2