8.9.2 Faults in operation
Table 8-2 Faults in operation
Symptoms of fault
↓ General uneven running of machine
↓ Vibrating brushes
↓ High temperature rise (general)
↓ Severe brush sparking
Possible causes of faults Remedial measures
Plant fault
X Coupled motor out of balance Check coupling, rebalance system
X X Poor alignment Align motor set
X X X Resonance in system Improve installation conditions or reduce exci‐
tation of vibration
Operating mode or operating error
X Continuous light-load duty (partial load) Change number of brushes and/or material
X Temporary overload Correct current limit on converter
X Continuous overload Correct current limit on converter/reduce down
periods of rest
Cooling fault
X Cooling air-flow rate too low (commutator temper‐
ature too high)
Improve ventilation circuit
Component defect
X Interturn fault Repair winding
X X Out-of-round commutator Rework commutator
X Rotor imbalance Balance rotor
X Bearing damage Repair or replace bearing
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 Remedial measures
X Wrong direction of rotation of the external fan Check the electrical connections to the external fan.
X External fan is not running Check the external fan and its connections.
X Reduced air flow Check the air ducts; clean the machine.
Operation
8.9 Faults
SIMOTICS DC 1GG5
76 Operating Instructions 02/2016
To Next Page
Loading...
Need help?
General