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(20)
(23)
(26)
OM 2012
.
Oven the protective
relay tray and place the test bon!: switch
(34,. Fig.
2) in TEST
BANK
position.
&in
place the load contactor
switch
(20) in the top,
CLOSE
position.
Light
(22) show Id glow GREEN
und remain 01 u when the switch
is released
and c/lowed to rcturn
to the center
ON
position.
This
indicu?es
that the
load bank switch
(34) is f unc,roning
to by-pass the plug intcrlcck
ielcy.
t'
Return the load bank switch
to AIRCRAFT
position.
The load contactor
shoujd
open
at
once and the green indicating
tight
(22)should
go off.
Connect
a soufce
of 24-V
DC power (two twelve-volt
Imi!.e:ics
connected
in'series)
to terminals
"IN" and "I-"
(or
"E") at the output
terminal
pane!.
Connection
polarity
shoukl
be: MINUS
to terminal
N and PLUS
to temrinal
E orF.
Place test-bank
switch
in AIRCRAFT
position.
Hold the contactor
operqting
switch
(20) in top,
CLOSE
position
momentarily,
The generator
"on"
indicating
light
(22) should glow GREEN
and remain on when the switch
is released and allowed
to
return
to the center
ON
position.
This
In-
dicates
that the ioad contactor
is closed and the plug interlock
relay is
functicning
properly.
.Apply l/3
to
l/2
(90 A to 130 A) load at the load bank and al low the unit
to
fun
for
15 to
30
minutes.
Observe
operation
of all monitoring
instru-
merits.
Increase
load bank resistance
to apply a full
load (260 A).
Check operation
of the governor
by observing
the frequency
meter
(1,
Fig.
2) when generator
is switched
from no-load
to full-load
and vice versa.
Use the contactor
control
switch
(20) t o apply and remove load several
times.
Frequency
droop should be no more thun
1 Hz.
Adiust governor
if necessary
(see Para.
4,
E,
(3).
.
Follow
instructions
in Para.
4,
B, (2) (b) t o set voltage
regulator,
line-drop
comp,ensation potentiometers
(Ref.
Figure
2,
items (38bnd (39).
Set knob
pointer
on cable size potentiometer
(39) to size
(2/O,
4/O,
etc.)
of cable
j being used.
Set knob pointer
on cable length potentiometer(38)
to length
Aug 25/85
2-3
Page 11
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