Installation manual
ELECTRONIC
REGULATION
SR7-2G
AVR
5
AMP
FUSE
OLD
N
=
ADJUSTABLE
THRESH
OVERLOAD
PROTECTIO
INTERVENTION
'"
AOJUSTABLETHRESHOLD
Am
OFUNDERSPEEO
/Hert
PROTECTION
INTERVENTION
Stab
p~
z~
1·-;
volt
------;
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0
0
1
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-
-
-
-
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-
5c
fa
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~
5
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CONNECT
FOR
60Hz
REMOVE
FOR
50Hz
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DESCRIPTION
The
voltage
regulator (AVR) ensures optimum
AC
generator
performance.
"This
advanced design AVR is equipped with
circuitry protection to guard against operating conditions that
could
be
detrimental to the
AC
generator.
The
following
information details the voltage regulators adjustments
and
connections.
These
procedures should
be
performed by a
qualified technician.
TERMINAl
CONNECTIONS
#1.
Excitation
field
DC
negative.
#2.
Exciter
field
jumper
to 3
if
the regulator
AC
supply
between
5 and 3A is less than 160 VAC.
#3.
Exciter
field
DC
positive.
#3A.
Supply
voltage to regulator (AC).
#4.
Sensing
voltage.
#5.
Supply
voltage to regulator (AC).
#6.
Jumper
to SA for
60
Hz
operation.
#7.
Not
used.
#58.
Not
used.
#5C.
Sensing
voltage.
POSSIBLE
CONNECTIONS
Exciter
Field:
The
exciter field negative should
be
connected
to
tenninall
of
the electronic regulator (normally
dark
blue
Or
black), while the positive (normally red
or
yellow)
should
be
connected to
tenninal3.
Supply:
There
are two possibilities.
1.
The
SUPply coincides with the sensing.
In
this case the
SR712
supply
should
be
connected to tenninals 3 and 5
(in
case
of
three-phase generators, terminal 5 is normally
connected
with the star point). Terminals 3 and 4 should
be
connected
to
each other in such a way that the supply
is
also
sensing.
This connection
in
necessary when the
generator
does not have auxiliary winding for supplying
the
regUlator.
2.
The
SUPply
and sensing separate.
"This
is the case
of
a
generator
equipped with auxiliary winding for regulator
supply.
Supply
is always connected to tenninals 3 and 5
of
the
regulator.
0
I
...,
-.
1}
...-I
4
-
3A
-
4
_J
-
2
~
1
EXCITER
FIELD
I
In
both
of
these cases, the
SR712
supply can
vary
from 80 to
270
VAC.
But
it should
be
noted that tenninals 2
and
3
should
be
bridged for supply with voltage
between
80 and
160 VAC, while the same tenninals should
be
left
open if the
voltage is between
160
and
270
VAC.
Sensing:
Sensing should
be.
connected to
terminals
4 and 5
and
can
vary from
80
to
350
VAC.
The
sensing
is
single
phase only
and
therefore is normally connected
to
one
alternator phase.
Operation
at
60
Hz:
When
operating at
60
Hz,
tenninals
SA
and
6 should
be
connected to each other in
order
to
keep the
low frequency protection correctly regulated.
A
WARNING:
Be
aware
that
high
voltages
may
be
present.
Take
all
necessary
precautionms
to
safe
guard
against
electrical
hazards.
FUNCTIONS
OF
THE
REGULATOR
POTENTIOMETERS
Volt: With this potentiometer,
it
is possible
to
adjust
the
voltage generated
by
the alternator in a very
simple
way.
If
the screw is turned clockwise, the voltage
increases,
if
the
screw is turned counterclockwise
it
decreases.
Stab:
This
potentiometer optimizes alternator
performance.
If
turned clockwise, the stability decreases
and
the
response
time decreases but the voltage tends to
be
less
stable.
If
turned counterclockwise, the response time
increases
and the
voltage tends to
be
more
stable.
In
order
to
adjust this potentiometer correctly,
we
advise
using the following method.
1.
The
generator must
be
working, starting
from
zero load
and
the potentiometer must
be
at
maximum
stability
(turned fully counterclockwise).
2. Slightly
tum
clockwise until the light
generated
by
the
filament lamp oscillates, at this point,
tum
the
potentiometer slowly counterclockwise
until
the
light
stabilizes.
Engines & Generators
36