Faults; Inspections In The Event Of Faults; Electrical Faults - Siemens SIMOTICS XP 1MB1 series Operating Instructions Manual

8.6

faults

8.6.1

Inspections in the event of faults

Natural disasters or unusual operating conditions, such as overloading or short circuit, are
faults that overload the machine electrically or mechanically.
Immediately perform an inspection after such faults.
Correct the cause of the fault as described in the respective remedial measures section.
Repair any damage to the machine.
8.6.2

Electrical faults

Note
If you are operating the motor with a converter, the operating instructions of the converter
must also be observed if electrical faults occur.
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
1LA5/6/7/9, 1LG4/6, 1MA6/7, 1MB..1/2/3/4/5 - SH 63 ... 355
Operating Instructions, 06/2018, A5E44455710A
↓ 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 insula-
tion resistances. Carry out repair work after
consultation with the manufacturer.
Check the connection.
Operation
8.6 faults
107