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N
THE
ELECTRICAL EQUIPMENT
+
0
·015"
t
Fi;~:
..
\-.1
M~rllnnical
.<elfin;~:
of
1he
Tf!!:Uiator
Loci..
nul.
~
.
Fi«d
cootKt atfJusuncrat
'
Volla,e
adJlbtin; sere-..
screv.·.
I.
Am\31ure
tension spring.
6.
Armature.
4.
Ann~nurc
securing
sc:rew.
7.
Core
face and
shim.
Li ke
the
regulator, the
operation
of the
cut-out is
temperature controlled by means
of a bi-meta
l
tensioning
sprin!.
Regulator adjustlllftll
The
regulator is carefully set before leaving the Works
to
'uit
the
normal requirements of the
standard
equip-
ment,
and in general it should
not
be nea:ssary to alter
it.
If,
ho"'e'er,
the
banery
does
not keep in a
charged
condition.
or
if the
dynamo
output does not fall "'hen
the
banery
is
fully charged. it may be adv;sable to check
the -ctllng
and,
if necessary, to readjust it.
It
is
important.
before altering the regulator
setting.
when the banery is in
a
low state
of charge,
to
check
that
its
condition is
not due
to
a battery defect
or
to the
dynamo belt slipping.
Electrical
Sdlilljl
(with unit
cold)
The
electrical
selling
of
the
control unit can be
checked without
removing
the cover. Use a good-
quality moving-coil
voltmeter
(0--20 volts).
Withdraw the
cables
from
the control box renmnals
'A'
and 'A
rand
c:onncct
these cables
together.
Connect the
ne~th-e
lead of the voltmeter to the
control box terminal
·o·
and
connec:t
the other lead
to
terminal
•a•.
Slowly increase the speed of
the
engine until the
\'Oil-
meter needle
'flicks'
and then
steadies. Thts
should
occur at a
voltmeter
reading
between
the appropnate
limits Si,en in
'GE:-IERAL
DATA',
according to
the
ambient
temperature.
N.l
2
If the voltage at whieh the reading becomes steady
occurs outside these limtts the regulator must be
adjusted.
Switch ofT the engine and remove
the
control box
cover.
Slacken the voltage adjusting screw loeknut
((I),
Fig.
N.7)
and turn
the
screw
in
a
clock,vise
d
irection to raise
the
selling
or
in
an anti-clockwise direction to
lower
the
setting.
T
urn the
screw only a fraction of
a tu rn at a
time and
then
tighten
the
locknut.
Repeat
as above
u
ntil
the
correct
selling
is obtained.
The adjustment of the regulator
open-circuit
volta~e
should be completed v.ithin
30
seconds.
othe..,.ise
hea
ting
of the shunt ,.;nding will cause false scllings to
be
made.
A
generator run at high
speed
on open circuit will
build up a high voltage. Therefore, "hen adjusting the
regulator, increase
the engine speed slowly until the
regulator operates, othe..,.ise a false selling may
be made.
Reconnect the
wires.
Mechanical
~ling
T
he
mcc.
h
anical or air gap seuinss of
the
regulator
shown
in
Fig.
N.7
are
accurately
adjusted before
leaving
the
Works and.
provided that the
a
rmature
carrying
the mov;ng
contact is not
removed, these
settings mu;t not be
tampered
with.
If.
however,
the
armature
has
been
removed
,
the
regulator
will
have
to
be reset. To do Ibis
proceed
as
follows.
Slacken
the
fiJ<ed contact locking nut and
unscrew
the
contact screw until
it is
quite clear of
tbe armature
moving contact.
Slacken the voltage adjusting screw locking
nut
and
unscrew the adjuster until it is well clear of
the armature
tension
spring.
Slacken
the
two
armature assembly securing
screws.
Using a
·015
in.
(·381
mm.)
thick feeler
gauge.
"'ide
enough
to
cover completely the core face, insert
the
gauge between the
armature
a
nd
the core
shim,
taki
ng
care
not
to
turn
up or
damage the edge
of
the
shim.
Press the
armature squanly
down against
the
gauge
and retighten
the
two
armature assembly securing
screws.
With the
gauge still in position, screw the adjustable
contact down until it
just
touches the
armature contact.
Retighten
the
locking
nut.
Reset the
voltage adjusting screw as described under
'Regulator
adjustment'.
Oeaaiag
contacts
After long
periods
of service it
may
be
found ncttSsary
to
cl<"an
the
regulator contacli. Clean the contacts hy
means of a
fine
carborundum stone or
fine
emery-doth
.
Carefully wipe away all traces of dust or other
foreign
ma
ller
with
methylated
spirits.
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