Setup Procedure
057-295 ISSUE: 1
Page 32 of 60
4.3.4 EXTERNAL BIAS SETTING
NOTE: Proceed with External Bias Setting only after the AVR has been correctly stabilised
by following the Stability Settings section first.
4.3.4.1
EXTERNAL POTENTIOMETER
NOTE: The external potentiometer is designed for manual adjustment of the output
voltage. Where automatic voltage matching or kvar sharing is required, use the DC Voltage
Input instead.
NOTE: Where both (External Potentiometer and DC Voltage Input) are used
simultaneously, both inputs are summed to determine the output voltage.
Connect a 5 k
Ω linear potentiometer (pot) to the AVR input terminals such that a clockwise rotation
increases its resistance. The pot must be
‘volt free’ i.e. electrically isolated from all other potentials.
Check the ‘Enable’ check box and enter
the desired control range of the pot.
For example, a setting of 10% allows
adjustment of a set point of 230 V over
the range 207 V to 253 V.
(230 V +/-10% )
An open circuit (disconnected or damaged) potentiometer is automatically detected by the AVR and
the output returns to the set point.
‘Check’
Enable
...
and configure the
required
Range
.
