Mechanical Faults - Siemens SIMOTICS XP Operating Instructions Manual

Operation
8.6 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
8.6.3

Mechanical faults

Table 8- 2 Mechanical faults
↓ Grinding noise
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X Rotating parts grind
X Rotor or coupling not balanced.
X Rotor out of round, 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
X X Changes in foundation
Take any changes into account when warming up the machine.
(1)
100
↓ 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
Mains voltage too high, frequency too
low
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 power supply conditions.
Check the power supply conditions.
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 rotor 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.
Establish the cause of the changes and eliminate them if necessary;
realign the machine.
(1)
1MB..5/6 shaft height 71 ... 355
Operating Instructions, 10/2021, A5E41926185A