KNF FP 70, Installation Instructions Manual

Page: 15 / 18

Installation Instructions FP 70 Rectifying transfer problems
KNF Flodos 330352_MA_FP70_EN_00
15
6 Rectifying transfer problems
Symptom Cause Remedy
Pump does not
work; no movement
or sounds are de-
tectable. No or incorrect control Check that voltage and signal form comply
with the specification.
Pump does not
work; drive be-
comes very hot. Motor is controlled with an
incorrect signal. Check that voltage and signal form comply
with the specification.
The pump does not
prime, or vacuum is
insufficient. External valve is closed. Check external valve.
Counterpressure on pres-
sure side is too high. Change the pressure conditions on the
pressure side.
Particles in the pump head Rinse the pump head.
Use a preventive preliminary filter.
Pump does not
transfer. External valve is closed, or
filter is clogged or too small. Check external valves and filter.
Connections or hoses are
blocked. Check connections and hoses.
Remove blockage.
Flow rate is insuffi-
cient or unstable. Incorrect control Check that voltage and signal form comply
with the specification.
Cross-section of hydraulic
hoses or connectors too
narrow or restricted 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.
Higher counterpressure in
the system than assumed
for the design Contact KNF representative.
Particles in the pump head Rinse the pump head.
Use a preventive preliminary filter.
Replace pump head.
Pump has reached the end
of its service life. Replace the pump.
Leak on pump head Damage to the valve O-
rings
Replace the O-rings.
Diaphragm damaged Replace the diaphragm.
Resonating diaphragm
damaged Replace resonating diaphragm.
If the malfunction cannot be rectified, contact your local KNF repre-
sentative (
www.knf.com ).