Trouble and Remedy for Rosenberg Fans when motor failure to start

Motor symptom: Failure to start

Possible causes:

·         Electrical supplies – phase

·         failure due to blown fuse

·         Electrical supply – low voltage

·         Faulty contact in controlgear

·         Overload

Remedy when motor failure to start

·         Trace and remove fault renew blown fuse

·         Switch off offending heavy load or refer to Supply Authority

·         Renew faulty contacts

·         Reduce loading or replace with larger motors

·         Remove foreign object or align impeller if touching casing or replace faulty bearings

Trouble and Remedy for Rosenberg Fans when motor tripping

Motor symptom: Motor tripping

Possible causes:

·         Motor over heated

·         Over Current

·         Motor overloaded

Remedy when motor tripping

·         Clean motor cover & ensure cooling fan is running

·         Coils burnt/shorted to rewind motor coils

·         Ground and replace bearings imbalance supply

·         Repair control panel

Trouble and Remedy for Rosenberg Fans when motor excessive hum

Motor symptom: Excessive hum

Possible causes:

·         Uneven gas

·         Winding fault

·         Rotor mechanically

·         Unbalanced

·         Foreign matter fouling air gap

Remedy when motor excessive hum:

·         Replacement bearings

·         Rewind or effect winding repair

·         Dynamically balance rotor

·         Dismantle and clear air gap

Trouble and Remedy for Rosenberg Fans when motor regular clicking noise

Motor symptom: Regular clicking noise

Possible causes:

Bearing worn due to lack of lubrication or excessive overload

Remedy

Fit replacement bearings and renew grease with recommended grade

Trouble and Remedy for Rosenberg Fans when motor knocking or rumbling noise

Motor symptom: Knocking or rumbling noise

Possible causes:

·         Bearing slack in housings

·         Bearing moving on shaft

Remedy

Fit replacement end shields or liners in bearing housings

Build up shaft diameter at bearing position or sleeve shaft to achieve correct diameter or fit replacement shaft

Trouble and Remedy for Rosenberg Fans when motor Excessive vibration

Motor symptom: Excessive vibration

Possible causes:

·         Foreign matter in bearing housing

·         Buildup of dust or damage to impeller

·         Rotor/impeller imbalance

Remedy when motor Excessive vibration

·         Wash out bearing and housing with paraffin or equivalent and renew grease with recommended grade

·         Clean impeller, replace if damage

The contact addresses are to be found in the attachment, or else please phone +49 (0)7940 / 0917 186 894 or email to info@rosenberg.com.vn