B. While observing
the
voltmeter, slowly turn
the
screwdriver clockwise
to
increase voltage
or
counterclockwise
to
"decrease voltage,
and
adjust
to the
rated nameplate voltage.
i
If
correct voltage cannot
be
attained through
this adjustment, proceed
to
Voltage Regulator
Adjustment procedure.
C. After setting^conrect
.voltage,
retighten locking
nut being carefuJ.not
to
change
the
adjustment.
2.
Operate Phase Selector switch
to the Off
position.
Voltage Regulator Adjustment
This procedure pertains
to
generator sets equipped
with Detector
AC
option only.
The
procedure performs
the adjustment range centering
of
voltage adjust
R21
potentiometer located
on the
control front panel.
1.
Operate Phase Selector switch
to
read generator
output current and voltage and perform
the
follow-
ing steps:
A.
B.
Insert
a
screwdriver'into
the
Voltage Adjust
R21
potentiometer located on the front of the genera-
tor
set
control
and
using
a
wrench carefully
loosen
the
locking
nut.
Turn screwdriver to set adjustment screw
to the
mid-position
and
retighten locking
nut
being
careful
not to
change
the
adjustment.
AWARNING
High voltages
in the
control
present
an
electrical shock
hazard which
can
cause severe personal
injury
or
death.
Proceed with care!
C. Open control panel doors, locate VRAS-2
(upper
left),
and
refer
to
Figure
20 to
locate
R32
potentiometer.
D. While observing
the
voltmeter, insert
a
screw-
driver into
R32
potentiometer and slowly turn
to
increase
or
decrease voltage until adjusted
to
the rated nameplate voltage.
2.
Close control panel doors
and
operate Phase
Selector switch
to the Off
position.
Generator Voltage Adjust
(Without
Detector
AC
Option)
This procedure pertains
to the
voltage adjustments
of a
generator set that does
not
have the Detector AC option.
AWARNING
High voltages
in the
control present
an electrical shock hazard which can
cause severe personal injury
or
death. Proceed with
care!
1.
Open control panel doors, locate VRAS-2 (upper
left),
and
refer
to
Figure
20 to
locate terminal board
TBI
and R32
potentiometer.
2.
Connect
an
accurate 2% voltmeter
to
VRAS-2 ter-
minal board
TB1
-2
and TBI
-3
terminals (Figure 20).
3. While observing
the
voltmeter, insert
a
screwdriver
into
R32
potentiometer
and
slowly turn
to
increase
or decrease voltage until adjusted
to the
rated
nameplate voltage.
4.
Disconnect voltmeter from
TB1 and
close control
panel doors.
GENERATOR
FREQUENCY CHECK
The generator frequency
is a
result
of
engine speed,
which
is
automatically controlled.
If
generator fre-
quency
is
below specification contact an Onan distribu-
tor.
19
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