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Alternator trouble shooting

发电机常见故障现象及处理办法

Failure

Cause

Treatment

 

 

Can not power 

        Alternator 

 

Wiring mistake

Check and correct according to wiring diagram

Severe defects such as broken line of rotor winding or excitation winding   

 

Check relevant winding resistance by the universal meter, and if winding resistance is infinite, broken line should be connected. If winding resistance is zero, it should replace or process coil.

Broken line of alternator stator winding and excitation winding

Check resistance by the universal meter, and if resistance is infinite, broken line should be connected.

Rotating-rectifier module breakdown and short circuit

Check forward reverse resistance by the universal meter and when it shows zero, rotating-rectifier module changes.  

AVR

The output lead wire is not connected.

Connect lead wire

The fuse is damaged.

Change the fuse in the inner voltage regulator.

Voltage regulator is damaged.

Change voltage regulator

No load voltage  is too low or  too high

alternator

The rpm of alternator is too low or too high.

Adjust generator speed to rated speed

Excitation winding is rare short.

 

The current of exciter’s excitation winding is large. Excitation winding is serious heat and big vibration. Excitation winding’s DC resistance is smaller than its normal value. It needs the return-to-factory service

Rotating-rectifier module is at fault.

Open NDE-shield’s cover back plate sheetdisconnect F1 or F2 joint, check rotating-rectifier module by the universal meter. If forward reverse resistance does not accord with the requirement of the properties of the diode, it changes damaged rotating-rectifier module.

AVR

Wiring mistake

 

Check whether wiring circuit is correct

Erroneous measure voltage causes low output voltage or unadjustable.

Voltage setting point is too low or too high.   

Adjust voltage set potentiometer in clockwise or counterclockwise 

direction until voltage meets with requirement.  

Remote voltage setting point is too low or too high.

Adjust remote voltage setting potentiometer in clockwise or counterclockwise

direction until voltage meets with requirement.

Voltage regulator is damaged.

 Change voltage regulator

 

Failure

Cause

Treatment

Voltage    oscillation

Voltage regulator is damaged

Adjust STAB knob, and if it can not make voltage stable, it should change voltage regulator.  

Voltage is not adjustable

Voltage regulator is damaged.

Change voltage regulator

Alternator  overheating

Alternator overload

Minimizes load to not exceeding nameplate rated value.

The power factor of the inductive load is low.

Adjust load to make exciting current not exceeding rated value  

The rpm of alternator is too low.

Adjust alternator speed to rated value  

Alternator vent is blocked.  

exclude blockage

Bearings overheating

Bearing is excessive worn out.

Change new bearing


Lubricating grease of brand is wrong, or grease is the impurity, or grease is overfilled.   

 

Bear is cleaned by kerosene, and change grease according to lubricating grease of brand, and the grease quantity should be 1/2—1/3 of

non-bearing room capacity.

The connection with prime mover is not good.

 Correction and alignment

Big vibration

The connection with prime mover is not good.

Correction and alignment

Rotor dynamic balancing is not good.

Dynamic balancing emendation

 Prime mover vibration

Check prime mover and adjust it

 

How does alternator do separated excitation?  What is separated excitation used for? 


How to do separated excitation?  Connect exciter’s stator wire ( mark “F1”“F2”)  with 12V DC power 12V DC power supply,“F1”connects the anode of DC power supply, “F2”connects the cathode of DC power supply. After insulation treatment, generator set starts and you observe generator voltage.  

What is separated excitation used for: before separated excitation, check whether circuit in the generator box body (include AVR wiring) is connected properly. Through separated excitation, judge the failure that is alternator body internal failure (stator, rotor, exciter stator, exciter rotor, rotating rectifier module) or generator box internal wiring failurecircuit wiring, AVR.  

 

For concrete trouble-shootings, please see PPT of alternator installation and trouble-shootings

 

After-sale service hot line: 079188350703

After-sale service fax: 079188350709


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