21
Problem
Possible cause
Solution
Thumping noise in the pump.
Vacuum build-up is extremely
high (close to full vacuum).
Adjust the vacuum regulator
valve on the stone catcher to
max. 8.5 metres on the gauge.
Problem
Possible cause
Solution
Pump is demanding abnormal
amount of power (drive is
overloaded).
Pump speed is too high.
Decrease diesel engine RPM or
motor speed (VFD).
Incorrect direction of rotation
(only electric driven pumps).
Reverse direction of rotation
(only electric driven pumps).
Problem
Possible cause
Solution
Drive unit is overloaded
Incorrect direction of rotation
Reverse direction of rotation
The operating speed is too high
Reduce operating speed
Problem
Possible cause
Solution
Pump does not rotate
Defective fuse.
Check fuse and replace if
necessary
Not receiving any power
).
Check electrical connections
Coupling between motor and
pump is defective
Replace the coupling
Thermal protection switch of the
start/delta switch cuts out.
Turn switch from stars to delta
more quickly
WARNING
If appear some pump defect and cannot find fault immediately contact
Uprent technical department.
