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ELECTRONIC REGULATION-AVR
PN.
052944.
OLD
'N
ADJUSTABLE THRESH
OVERLOAD PROTECTJO
=
o·
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0
1
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1
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. SAMP.FUSE
54456)
(PN.O
I'NTERVE'NTIO'N
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z~
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ADJUSTABLE THRESHOLD
.
HAmrfzp
OF UNDERSPEED
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e
PROTECTION J'NTERVfNTIO'N :
stab
volt
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«iil
oo:
B
G;)::e·
.
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7
~~.
.
::::
~
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0
0:::
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CONNECT FOR 60Hz
REMOVE FOR 50Hz
1-
1-
r-
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D
. .
DESCRIPnON
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 procedilres should
~
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.
#5B. Not used.
#5C.
Sensing voltage.
POSSIBLE CONNECTIONS
ExCite~ Field: The exciter field negative should be
connected
to
terminall of the
electr9~
regulator (poJ1.llally .
dark blue
Or
black}. while
the '{jositi~~'trtbrmally
red or ·. . . .
yellow) should be ponnected
to
tehninal3.
Supply: There are two possibilities.
1. The supply coincides with the sensing.
In
this case the
· SR7/2 supply should be connected
to
terminals 3 and 5
(in case of three-phase generators, terminal
5
is normally
connected with the star po,int). 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 terminals 3 and
5
of the regulatm:.
0
[
,......$.:
.
.......
~
D
~ 4-
I:
"'-f4
J:::..l
EXCITER FIELD
I
.
.
In both of these cases, the SR7/2 supply can vary from 80 to
270 VAC. But it &J:wuld be noted
that
terminals 2 and 3
should be bridged 'fer; supply with voltage between 80 and ·
160 VAC, while the
Sa.riie
terminals should be left open if the
voltage is between
160.~d.
270 VAC.
· Sensing: · Sensing shouldbe~connected to termimtls 4 and 5
and
can
vary from 80 to 3SOVAC. The sensing is single
phase only and therefore
is
normally connected to one
·
alternator phase.
Operation at 60 Hz: When operating at 60Hz, terminals SA
and 6 should
be
conne<;ted to eaeh other in order to keep the
low frequency J?!Otection correctly regulated.
A
WARNING:
Be
aware that high voltages may be
present. Take
all
necessary precautlo"- . to sate guard
against electrical hazarils.
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'altemator performance.
·.Ifti!irie(i
~loC~se,~the:·~ility ~reases.and
the response
:.
time~~but.thif:;vofta
··
teilds.t6-beless
stable. If
' ..... , ............ '
. ge
. . .
. .
tumecf coiiiiterdlock:Wise, the response
litfie
increases and the
voltage tends to be more stable.
In
order to
a~just
this potentiometer
correctly;·w~a4~se·
using the following method.
1. The g~erator 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
filanient lamp oscillates, at this point.
tum
the
potentiometer slowly counterclockwise until the light
stabilizes.
I""'IV.jfYESISRBEKE
{EngJ.nes ~ (i.enerators
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