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Installation...

  For more detail of installation, commissioning and trouble shooting, please click here..
»   SELECTION OF SITE
»   FOUNDATION DETAILS AND GUIDELINES
»   EARTHING SYSTEM
»   EXHAUST PIPING
»   FUEL PIPING
»   CABLING
»   BATTERY CHARGING PROCEDURE
»   SUMP CAPACITY (LITRES)
»   CHECK UP BEFORE STARTING THE DG SET
»   PRE-COMMISSIONING CHECK
»   ROUTINE CHECK POINTS
»   DO'S & DON'T'S
»   TROUBLE SHOOTING - ENGINE
»   TROUBLE SHOOTING CHART : ALTERNATOR
»   TROUBLE SHOOTING GUIDE FOR MANUAL PANEL
»   TROUBLE SHOOTING GUIDE FOR AMF PANEL
 
TROUBLE SHOOTING CHART : ALTERNATOR

Description

Causes

Remedies

 

 

 

 

 

 

 

 

No voltage from Alternator

Decfective voltmeter

Check voltmeter and replace

Short circuit between phases

Check and ensure no short circuit between phases.

Neutral earthing short with body earthing

 

Check and rectify

Power cable faulty

Cehck and replace

Excitation circuit open

Check for loose connection

Incorrect excitation circuit connection

 

Check for proper connection

 

 

 

Low residual voltage

Check for residual voltage. If residual
voltage is less than 2.5V(L-N) field flashing required for few seconds.

Field fleshing procedure-
1. Disconnect regulator connections.
2. Connect 12/24V battery keeping F1 to positive and F2 to negative terminal of excitor stator.

Grounded excitor field

Check and correct

Rotating rectifier faulty

Check rotating diodes

Fuse in AVR failed

Replace fuses

AVR Defective

Replace AVR

 

Voltage developed but excitation current is high

 

Rotating diode faulty

Check rotating diodes and replace faulty diodes

Prime mover

Adjust prime mover

Prime mover speed is low

Adjust prime mover speed to rated speed

 

Low voltage build up

V-Trim pot incorrectly set

Adjust voltage by V-Trim pot in AVR

Low prime mover speed

Adjust prime mover speed

 

Voltage-High

Loose or no connection to 'U' terminals of the AVR

 

Check and correct

Incorrect voltage setting

Adjust voltage by V-Trim pot in AVR

AVR Defective

Replace AVR

 

 

 

Voltage fluctutation

Speed fluctuation of the prime mover

 

Set the speed of the prime mover

Incorrect setting of stability pot

Adjust stability pot in AVR

Leading load power factor

Correct the power factor

Load hunting,fluctuates rapidly

Check and reduce the nonlinear load

High percentage of non-linear load

Rectification, Correct percentage of
non linear load

 

 

Over loading of Generator

Over loading of generator

Check the load and correct. To be in line with name plate rating

Blocking of ventilation passage

Check ventilation and clean passage if necessary

Low speed on load

Adjust prime mover speed

Low load power factor

Reduce the load

Generator operating at very high voltage

Check voltage and adjust

High percentage of non-linear load

Check and reduce the nonlinear load

 

Excessive vibration and noise

Poor alignment

Re-align properly

Coupling and foundation bolts loose

 

Tighten the bolts

Bearing defective

Replace bearing

 

Over heating of bearing

Incorrect assembly of bearing

Re-assemble correct

Bearing damaged

Replace bearing

 

Generator does not share
KW load proportionately

 

Prime mover speed droop improperly set

Set prime mover speed properly,Droop ( Governor) characteristic of engines.

 

Generator does not share
KVAR load proportionately

Quadrature droop incorrect

Set quadrature droop correctly by
QDC Pot in AVR

QDC-CT Polarity reversed

Interchange CT secondary

QDC-CT are not in W-phase

Check and rectify

 
 
 
 
 
 
 
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Manufacturer India