operation instruction - SONDERMANN Pumpen + Filter GmbH & Co ...

Operating Instructions
8 Troubleshooting
Malfunction Causes Corrective action
Pump does not work when
switched on
Magnetic clutch is
disengaged
Motor is overheating
No voltage
Impurities in the pump
housing
Specific gravity and/or
viscosity of the fluid is too
high
Pump was switched off, then
switched on again before the
rotor stopped
Clogged ventilator cowl
Test the voltage
Remove the impurities
Reduce the delivery rate; use
a stronger magnetic clutch
and a more powerful motor
The rotor should have
stopped before the pump can
be switched on again
Clean the ventilator and the
cowl
Pump is working, but not
delivering
Motor is overloaded
Gas accumulation in the lines
Reduce the delivery rate
Use a stronger motor
Evacuate the lines
Valve in suction / delivery line Open the valves
is closed
Too much flow noise Cavitation Increase the suction line
cross-section
Reduce the delivery rate
cool down the fluid
Pump is not sucking No fluid in the pump Open the vane
Delivery rate too low
Delivery rate too high
Air in the system
Suction and delivery line
cross-sections are too small
(significant losses)
Valve is not entirely open
Pump losses are less
significant than presumed
Evacuate the system
Increase the suction and
delivery line cross-sections
Entirely open the valve
Install a flow control valve in
the delivery line
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