5 Error diagnosis
P3 240-840A
29
Malfunction
Causes
Motor does not run
- Wrong power supply and motor connections
- Activated fuses
- Missing enable or command value
- Current limit too low
- Missing BTB
Motor speeds up
- Wrong polarity of the actual value (tacho)
- Values of the tacho switch S9 too low
- Command value too high
For armature voltage control
- Field current too low
- Fuses, armature voltage feedback activated
Motor runs unsteadily
- Mechanical defect of the tacho
- Tacho malfunction
- Amplification of the speed controller too low or too high
- Wrong PID parameter
- Command value errors
- Amplification of the current controller too low or too high
No motor torque
- Current limits too low
- Field current too low
- Mechanical overload of the axis
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