8.1 Mechanical function 8 Trouble tracing
58
,
Speed too low
Noise
Smell
Damaged or worn bearings.
Overheating
Stop immediately as above
Renew
Overheated motor Poor cooling Remedy
Speed too high Power supply frequency too
high
Check. Remedy
Motor defect Check. Remedy
Speed too low Voltage drop of power supply Check and remedy the fault
Open bowl = overloading of
motor. Bowl leaking
See ‘‘8.2 Sediment discharge
function” on page 59
Water in worm gear housing Condensation
Leakage of oil cooling coil Change or repair the coil
Stopping
Braking time too short Pressure of air to brake is too
high
Check. Remedy
Bowl is leaking See ‘‘8.2 Sediment discharge
function” on page 59
Motor defect Check. Remedy
Defect in driving device Check. Remedy
Braking time is too long Worn or oily brake lining Change or clean
Pressure of air to brake is too
low or air supply not turned on
Check. Remedy
Moderate vibration at the critical speeds during starting and
stopping is normal
Indication Cause Remedy
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