Installation manual

VOLTAGE REGULATOR ADJUSTMENTS
Description
The voltage regulator is an advanced design which ensures
optimum AC alternator performance. It is equipped with
complete protection circuitry to guard against operating
conditions that could be detrimental to the AC alternator.
VOLTAGE REGULATOR
Volts
This potentiometer is used to adjust output voltage. At proper
engine operating speed the output voltage should be held at
:::!:1 % from a no-load condition to a full rated generator output
and from power factor 1.0 - 0.8 with engine drive speed vari-
ations up to -6%.
Prior to starting the engine, turn the VOLT and STAB trim-
mers (using a mini phillips screwdriver) fully in a counter
clockwise (Minimum) direction until you feci them hit their
stops.
Turn the AMP and HERTZ trimmers completely clockwise
(Maximum) in the same manner.
With the alternator running at
no-load, at normal speed, and
with
VOLT adjust at minimum, it is possible that output volt-
age
will oscillate. Slowly rotate the VOLT adjust clockwise.
The voltage output of the alternator will increase and stabi-
lize. Increase the voltage to the
desired value. In this situa-
tion, only the green LED will stay lit,
Stability
This potentiometer permits variation of the regulator'S
response to generator load changes so as to limit overcom-
pensation and obtain a minimum recovery time to the normal
voltage output.
In order
to adjust the regulator stability the alternator must be
running at no-load and the
output must be monitored.
Tum the STAB adjust slowly clockwise until the voltage
starts to fluctuate. At this point rotate the STAB adjust coun-
terclockwise until the voltage is stable within 1 or 2 tenths of
a volt.
red
~
green c
w
~
yellow
~
Hertz
"
Amp
m
E
Slab
0
'E
Volt
m
"
~
VOLTAGE REGULATOR DIAGRAM
Amp-Hertz
These two adjustments arc used in conjunction with the two
protection circuits in the voltage regulator that are indicated
by the illumination
of a colored LED lights.
l, Delayed overload protection (yellow LED),
2, Low
speed protection (red LED),
Both
systems have an intervention threshold which can he
adjusted using the respective potentiometer. Each of the two
circuits are able to cause an adequate reduction in excitor
voltage to safeguard the excitor windings and prevent their
overheating.
The overload protection system has a delay which permits
temporary
overloading of the generator during times such as
motor start-up
or other similar load surge demands. The reg-
ulator also has a third
LED (green), that glows during gener-
ator operation to indicate correct operation
of the regulator
with
the generator.
Setting the Overload Protection
In order to set the AMP overload protection, the alternator
must
be loaded to its full output rating.
1. Load the alternator to its rating, then decrease the speed of
the engine by 10,10% (54 Hertz on 60 hertz units, 45
hertz
on 50 hertz units),
2. Rotate the
AMP adjustment countcrclockwise until it hits
its stop. Wait about
15-20 seconds after which the AC out-
put of the alternator should drop and thc yellow LED light
should come on.
3.
Slowly rotate the AMP adjustment clockwise until the
output voltage increases to approximately
97% of the
voltage output at the start
of the adjustment. At this point
the
yellow LED light should corne on.
4. Return
to nominal speed, the yellow LED will turn off
and the alternator voltage will rise to its normal value.
Should this not happen, repeat the adjustment.
NOTE: When changing from 60 hertz to 50 hertz operation,
remove the
60 hertz jumper bar from the regulator hoard.
Setting the Underspeed Protection
NOTE: If the unit is operating al 60 /-Iertz ellsure [hal the
jumper strap is in place 011 the regulator board hetween the
Iwo 60 Herlz terminals. III order 10 adjust the ullderspeed
setting, the alternator should be running at lIo-load.
1. To adjust the undcrspeed (low frequency) protection circuit,
lower the engine speed
at 90% of its normal running speed
(54 hertz on 60 hertz units, 45 hertz on 50 hertz units.
2. Rotate the Hertz
adjustment counterclockwise slowly until
the
alternator's AC output voltage starts to decrease and at
the
same time the red "LED" light comes on.
3. Increase the engine
speed to its normal speed (frequency).
The red "LED" light will go out and the AC voltage out-
put will return to normal.
With
the above adjustments made, the regulator should func-
tion normally.
Engines & Generators
38