Faults; Fault Diagnosis Table; Table 6-1 Diagnosis Table For Mechanical Faults; Table 6-2 Diagnosis Table For Electrical Faults - Siemens 1PH728 Series Operating Instructions Manual

Faults

6
6.1

Fault diagnosis table

Diagnosis table for mechanical and electrical faults
The tables below list general faults caused by mechanical and electrical influences.
Table 6-1 Diagnosis table for mechanical faults
Mechanical fault characteristics
- rubbing/grinding noise
- high temperature rise
- radial vibration
- axial vibration
Possible causes of fault
x - Rotating parts rubbing/grinding
x - Air supply restricted,
filter dirty,
possibly wrong direction of rotation
x - Rotor not balanced
x - Rotor out of true, shaft bent
x x - Poor alignment
x - Motor coupled up not balanced
x - Shocks from motor coupled up
x x - Imbalance originating from gearing
x x - Resonance with the foundation
x x - Changes in foundation
1. Apart from eliminating the cause of the fault (as described under "Remedial
measures"), you must also rectify any damage the motor may have suffered.
2. Take any changes possible due to a rise in temperature into account.
Table 6-2 Diagnosis table for electrical faults
SIEMENS AG - Operating Instructions
Three-phase induction motor 1PH728.
Overview – Mechanical faults
1)
Remedial measures
Determine cause and adjust parts
Check air passages,
clean filter,
replace fan if necessary
Decouple rotor and rebalance
Consult the manufacturer
Align motor unit, check coupling
Rebalance motor coupled up
Check motor coupled up
Adjust/repair gearing
After consultation, reinforce foundation
Determine cause of changes and
eliminate; realign motor
2)
6-1