FITTING AND OPERATING
SUMMARY OF AVR CONTROLS
CONTROL
FUNCTION
DIRECTION
VOLTS
TO ADJUST GENERATOR OUTPUT VOLTAGE
CLOCKWISE INCREASES OUTPUT VOLTAGE
STABILITY
TO PREVENT VOLTAGE HUNTING
CLOCKWISE INCREASES STABILITY OR DAMPING EFFECT
STABILITY SELECTION
TO OPTIMISE TRANSIENT PERFORMANCE
LINK DEPENDING UPON KW OUTPUT
UFRO
TO SET UNDER FREQUENCY ROLL OFF KNEE POINT
CLOCKWISE REDUCES THE KNEE POINT FREQUENCY
FREQUENCY SELECTION
TO SELECT ‘UFRO’ CONTROL RANGE
LINK DEPENDING ON OPERATING FREQUENCY
DROOP
TO SET GENERATOR DROOP TO 5% AT FULL LOAD 0 PF
CLOCKWISE INCREASES THE DROOP
TRIM
TO MATCH AVR INPUT
CLOCKWISE ALLOWS THE ACCESSORY MORE CONTROL OVER AVR
DIP
TO SET THE INTIAL FREQUENCY RELATED VOLTAGE DIP
CLOCKWISE INCREASES THE VOLTAGE DIP
OVER/V
TO SET THE OVERVOLTAGE PROTECTION CUT OFF LEVEL
CLOCKWISE INCREASES THE OVERVOLTAGE CUT OFF LEVEL
RMS
SET AND SEALED AT FACTORY
The AVR is fully encapsulated to ensure long trouble-free
operation. It is usually fitted on a panel of the terminal box. It
can also be separately fitted in a switchboard.
ADJUSTMENT OF AVR CONTROLS
VOLTAGE ADJUSTMENT
The generator output voltage is set at the factory, but can be
altered by careful adjustment of the volts control on the AVR
board, or by the external hand trimmer if fitted. Terminals 1 &
2 on the auxiliary terminal block inside the generator terminal
box will be fitted with a shorting link if no hand trimmer is
required.
Do not increase the voltage above the
rated generator voltage. If in doubt, refer
to the rating plate mounted on the
generator case.
If a replacement AVR has been fitted or re-setting of the
VOLTS adjustment is required, proceed as follows:-
1) Before running generator, turn VOLTS control fully anti-
clockwise.
2) Turn remote volts trimmer (if fitted) to midway position.
3) Turn STABILITY control to midway position.
4) Connect a suitable voltmeter (0-300V ac) across line to
neutral of the generator.
5) Start generator set, and run on no load at nominal
frequency e.g. 50-53Hz or 60-63Hz.
6) If the red Light Emitting Diode (LED) is illuminated, refer
to the Under Frequency Roll Off (UFRO) adjustment.
7) Carefully turn VOLTS control clockwise until rated voltage
is reached.
8) If instability is present at rated voltage, refer to stability
adjustment, then re-adjust voltage if necessary.
9) Voltage adjustment is now completed.
STABILITY SELECTION
The "jumper" selector lead should be correctly linked for the
frame size of the generator (See diagram above).
