ELECTRICAL
EQUIPMENT
(b)
Regulator Adjustment
The regulator is carefully set during
manufacture and, in general, it should
not be necessary to make
further
adjustment. If, however, the battery
does not keep in a charged condition,
or if the generator output does not
fall when the battery is
fully
charged,
the setting should be checked and,
if
necessary, corrected.
It is important before altering the
regulator setting to check that the low
state of charge of the battery is not due
to a battery defect or to slipping of the
generator belt.
(i)
Electrical
Setting
It is important that only a good
quality
MOVING COIL VOLT-
METER
(0-20
volts) is used
when checking the regulator. The
electrical setting
can
be checked
without removing the cover from
the control
box.
Withdraw the cables from ter-
minals
A
and
A1
at the control
box
and connect these cables
together.
Pig.
29
Cut-out
and
Regulator
Assembly.
Connect
the negative lead of the
voltmeter to conml
box
terminal
D
and connect the other lead to
terminal
E.
Slowly
increase
the speed of the
e
until
the voltmeter needle
cks
"
and
then
steadies. This
should
occur
at a voltmeter read-
ing
between
the appropriate
limits
given
in
Para.
2
(a)
according to
the ambient tanpuature.
If
the voltage at which the reading
becomes steady occurs outside
these limits, the regulator must be
adjusted.
ARMATUHE
FIXING
SCREWS
REGULATOR
FRAME 0.020" ,ARMATURE
\
CORE
/
"
FIXED
CONTACT 0.006-0.017"
BRACKET WITH
ARMATURE
PRESSED
TO CORE
Fig.
30
Mechanical
Setting
of
Regulator.
Shut off the engine and remove
the control
box
cover.
Release locknut A (see Fig.
29)
of
adjusting screw
B
and
mm
the
screw in a clockwise direction to
raise the setting or
in
an anti-
clockwise direction to lower the
setting.
Turn
the screw only a
fraction of a
turn
at
a
time and
then tighten the locknut. Repeat
as above
until
the correct setting
is obtained.
Adjustment of regulator open-
circuit voltage should be com-
pleted
within
30
seconds, other-
wise heating of the shunt winding
will
cause false settings to be
made.
Remake the
ori@ connections.
A generator
run
at high speed on
open circuit
will
build up a high
voltage. Therefore, when ad-
justing the regulator, do not
run
the engine up to more than
half
throttle or a false setting
will
be
made.
(G)
Mechanical Setting
The mechanical or air-gap set-
tings of the regulator, shown in
Fig.
30,
are accurately adjusted
before leaving the works and,
provided that the armature
carry-
mg the moving contact is not
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