Mechanical Faults; Table 8-1 Electrical Faults; Table 8-2 Mechanical Faults - Siemens LOHER CHEMSTAR 1PS5 Operating Instructions & Installation Instructions

Operation
8.9 Faults
Table 8-1 Electrical faults
↓ Motor fails to start
↓ Motor accelerates sluggishly
↓ Rumbling noise during startup
↓ Rumbling noise during operation
↓ High temperature rise during no-load operation
↓ High temperature rise with load
X X X X
X
X X X X
X
X
X X X X
X X X
X
8.9.3

Mechanical faults

Table 8-2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotating parts grind
X Stator or coupling not balanced.
X Rotor out of true, shaft bent
X X Poor alignment
X Coupled machine not balanced
X Shocks from coupled machine
X X Uneven running of gear unit
X X Resonance of the overall system
comprising motor and foundation
78
↓ High temperature rise of individual winding sections
Possible causes of faults
Overload
Interrupted phase in the supply cable
Interrupted phase in the feeder cable
after switching on
Mains voltage too low, frequency too high Check the power supply conditions.
Mains voltage too high, frequency too low Check the power supply conditions.
X Stator winding incorrectly connected
X Winding short circuit or phase short
circuit in stator winding
Incorrect direction of rotation
Remedial measures
Reduce the load.
Check the switches and cables.
Check the switches and cables.
Check the winding connection in the terminal box.
Determine the winding resistances and
insulation resistances. Carry out repair work after
consultation with the manufacturer.
Check the connection.
Remedial measures
Establish the cause and realign the parts.
Disconnect the stator or coupling and rebalance.
If the machine has two shaft ends, and a transmission element is
only fitted to one end, secure the fitted key at the other end to
prevent it from being thrown out. If the rotor has balance type "H"
(standard type), the fitted key must be cut back to roughly half of its
length.
Consult the manufacturing plant.
Align the machine set; check the coupling.
Rebalance the coupled machine.
Investigate the coupled machine.
Fix the gearing.
Stabilize the foundation following consultation.
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LOHER CHEMSTAR 1PS5
Operating Instructions 03/2014