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TROUBLESHOOTING
5
TROUBLESHOOTING
WARNING
Disconnect and lock the power supply to
the pump drive before any work is carried
out.
In case the motor is fitted with a frequency
controller and has a single phase power
supply, wait at least two minutes to make
sure that the capacitors have discharged.
The main problem cause related to the bare shaft set is
poor alignment of the coupling halves. This will cause
the pumphead to wobble while it is driven, even without
discharge pressure or piping connected.
With proper alignment the pump will show some
movement caused by the drive torque and the reaction
force from the rotor. This movement will be within the
coupling alignment tolerances as given in section 6.4
Poor misalignment will shorten the lifetime of the
bearing in the bare shaft kit, the bearing(s) in the
gearbox and the spider in the flexible coupling. Follow
the checklist if problems or doubts exist. If no relation
with alignment can be found for any problem refer to the
chapter Troubleshooting in the pump's manual.
24
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