Siemens SIMATIC S5 1P 243, Operating Instructions & Installation Instructions

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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
↓ High temperature rise of individual winding sections
Possible causes of faults Remedial measures
X X X X Overload Reduce the load.
X Interrupted phase in the supply cable Check the switches and cables.
X X X X Interrupted phase in the feeder cable
after switching on
Check the switches and cables.
X Mains voltage too low, frequency too high Check the power supply conditions.
X Mains voltage too high, frequency too low Check the power supply conditions.
X X X X X Stator winding incorrectly connected Check the winding connection in the terminal box.
X X X X Winding short circuit or phase short
circuit in stator winding
Determine the winding resistances and
insulation resistances. Carry out repair work after
consultation with the manufacturer.
X Incorrect direction of rotation Check the connection.
8.9.3 Mechanical faults
Table 8-2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults Remedial measures
X Rotating parts grind Establish the cause and realign the parts.
X Stator or coupling not balanced. 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.
X Rotor out of true, shaft bent Consult the manufacturing plant.
X X Poor alignment Align the machine set; check the coupling.
(1)
X Coupled machine not balanced Rebalance the coupled machine.
X Shocks from coupled machine Investigate the coupled machine.
X X Uneven running of gear unit Fix the gearing.
X X Resonance of the overall system
comprising motor and foundation
Stabilize the foundation following consultation.
Operation
8.9 Faults
LOHER CHEMSTAR 1PS5
78
Operating Instructions 03/2014