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Operation
8.9 Faults
8.9.2
Faults in operation
Table 8-2
Faults in operation
Symptoms of fault
↓
↓
↓
↓
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
8.9.3
Faults at the external fan
The following table shows the possible causes of and remedial measures for faults on forced-
ventilated machines.
Table 8-3
Cooling system faults
↓ High temperature rise with load
Possible causes of faults
X
Wrong direction of rotation of the external fan
X
External fan is not running
X
Reduced air flow
78
General uneven running of machine
Vibrating brushes
High temperature rise (general)
Severe brush sparking
Possible causes of faults
Plant fault
Coupled motor out of balance
Poor alignment
Resonance in system
Operating mode or operating error
Continuous light-load duty (partial load)
Temporary overload
Continuous overload
Cooling fault
Cooling air-flow rate too low (commutator temper‐
ature too high)
Component defect
Interturn fault
Out-of-round commutator
Rotor imbalance
Bearing damage
Remedial measures
Check coupling, rebalance system
Align motor set
Improve installation conditions or reduce exci‐
tation of vibration
Change number of brushes and/or material
Correct current limit on converter
Correct current limit on converter/reduce down
periods of rest
Improve ventilation circuit
Repair winding
Rework commutator
Balance rotor
Repair or replace bearing
Remedial measures
Check the electrical connections to the external fan.
Check the external fan and its connections.
Check the air ducts; clean the machine.
SIMOTICS DC 1HQ7
Operating Instructions 02/2016
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