POWER DRIVE SYSTEMS
DUNLITE UVR100 AUTOMATIC VOLTAGE REGULATOR
1
GENERAL
This regulator is a solid-state device primarily designed to give precise and stable voltage regulation of an
alternator under adverse operating conditions.
The regulator is suitable for operation on either single or three phase 240/415 or 120/208 volt brushless
alternators.
OPERATION
The regulator senses the output voltage of the alternator and compares this value with a pre-set voltage
reference within its circuitry. The regulator constantly adjusts the field excitation of the alternator to
compensate for variations in load and prime mover speed, and holds the output voltage to within plus or
minus 1.5% no load to full load, unity to 0.8 power factor lagging, and a speed variation of 4.5%.
CONNECTION DETAILS
There are 14 screw terminals on the regulator and their functions are as follows. Early models are labelled
R.W.B in place of U.V.W.
N - Must always be connected to the neutral of the alternator.
U & V - Sensing terminals for voltage regulation.
W - Power terminal for exciter field.
F+ F- - Alternator exciter field terminals.
pp - Terminals for a 5k remote voltage adjustment potentiometer.
D1,D2 - Terminals for the addition of drooping circuit for parallel operation.
S+ S1 - Terminals for remote indication of the SCOOP operation, Series 2000 control (later models only).
THREE PHASE OPERATION
The regulator must be adjusted for either 415 or 208 volts sensing, depending on the available sensing
leads on the alternator. If in doubt, contact Dunlite, stating alternator serial number.
Open the regulator box by unclipping the side catches, and adjacent to the transformer, will be found four
pins connected to various taps of the transformer. The purple fly lead must be connected to the relevant
pin to match the regulator to the available sensing outputs of the alternator.
Starting from the pin nearest the transformer, the sensing voltages are 120V, 208V, 240V, 415V.
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