Help with faults
110
Operating instructions VISCOPOWER
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9.2.1 Fault table
Fault
Cause
Measure
Medium leaks above
the progressive cavity
pump
Mechanical seal defective /
worn
Replace the mechanical seal
Mechanical seal not posi-
tioned correctly on counter
ring
Grease the shaft surface on the sliding
ring seat with suitable lubricant
Medium leaks be-
tween clamp connec-
tions
Seals on clamp connections
missing or defective
Switch off the progressive cavity pump
and check the seals
Clamp connection insuffi-
ciently tightened
Switch off the progressive cavity pump
and check the clamp connections
Medium leaking
(mechanical seal)
Sliding ring not positioned
correctly on counter ring
Grease the shaft surface on the sliding
ring seat with suitable lubricant
No flow
Pump shaft broken
Replace the pump shaft
Insufficient flow
Stator or rotor heavily worn
Replace the rotor and/or stator
Stator and rotor are not com-
patible
Check the compatibility between rotor
and stator
Motor switches off
(Overload)
Counterpressure too high
Reduce the counterpressure
Blockage
Switch off the progressive cavity pump
and remove the blockage
Motor running but
progressive cavity
pump does not pump
Pump shaft broken / rotor
blocked
Replace the pump shaft
Motor running but
progressive cavity
pump does not pump
(Asynchronous mo-
tor)
Motor running in the wrong
direction. Due to the free-
wheel, the progressive cavity
pump cannot be driven in the
wrong direction
Have the direction of motor rotation
reversed by a qualified electrician
Motor does not start
Motor was overloaded
Let the motor cool down
Mains cable/plug defective
Have the mains cable and plug
checked by a qualified electrician
Progressive cavity
pump vibrates
strongly
Progressive cavity pump is
running dry
Switch off the progressive cavity pump,
check the fluid level
Pump shaft is bent
Replace the pump shaft
Stator housing can-
not be completely
screwed onto pump
tube
Stator not correctly positioned
in stator housing
Position the stator in such a way that
the lug of the stator housing engages
in the groove of the stator
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