Table of Contents
Advertisement
OM 2012
Al
"imq;!~er~oI"
co!~:~ccl-or (12) pr-ovidcs a me:j:;s of quickly
disconn~ctir:;7
all Wires to control
box
cc'mpsnerits.
(e)
Tray
T/-,5 Iray
(15) slides
in und out on nylon
rolizrs
.
It i; WcurXl
in p2cK~2
by a twist-lock,
screw fastener
(6).
(f)
Manual
voltage
control
We-11 the automatic
manual switch
(1 7)
is
placed
in MWUAL
position,
AC power
is supplied
to the rectifier
(14) rafhcr
than to thz automstic
vohage
regu!ator
.
The DC output
of the rectifier
is routed
to the exciter
field
through
a rheostat
(13j.
Tb ,e gensratcjc- output
voltage
is thereby
manually
controlled
by adjustmnt
of the rheostat.
(g)
Excii,ation-deenergization
relay
The purpose
of this re lay (3) is to allow
automatic
excitation
to be
connected
to the exciter
field
cnly
when engitle
sEed
is btiing controlled
by the e let tr ic governor.
(2)
Protective
relay
tray (see Figure
10)
The bottom
tray
in the control
box is identified
as tile protecfivc
relay
tray and
contains
electrical
and electronic
safety
devices
designed
to protect
the air-
craft electrical
sFtem
against
damage
which
could
result
from overvoltage,
undervo I tage ,
overfrequency,
or underfrequency.
The tray also contains
devices
for the protection
and control
of the generator
output electrical
sptem.
(a)
Sensing
modules
The voltage
sensing
module
(5) and frequency
scns ing modu ie (6) are connected
to generate
output
leads between
the generotcr
and load contactor.
These
solid-state
modules sense any abnormal
condition
of voltage
DT frequency
and
signal
the solidstate
circuitry
of the memory and time delay
module
(4) to
open the load contactor
and disconnect
output
to the aircraft.
Trip values
are adjustabl&,
however,
adjustments
should
be made ONLY
under
laboratory
conditions.
A solid-state
overload
signaling
device
(Ref.
7,
Fig.
13) is ako
connected
to the protective
monitu
module and perfwms
a function
similar
to the
voltage
and frequency
sensing
modules .
1-l
Page 18
Aug 25'85
Hide quick links:
Advertisement
Table of Contents
