Onan LTC Series - Page 18

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PICK
UP
ADJUSTMENT
CONTROL
-
(Cap
Removed)
DROP
OUT
ADJUSTMENT
CONTROL
(Cap
Removed)
INSTALL
/
JUMPER
,
TEMPORARY
WIRE
HERE
-t
i
lro
LINE
.
TRANSFCRMER
PRESENT
WHFhi LiNE
\/OLTAGE
IS
;20-ri.
I
T
ONLY
OVE R
FIG.
dtrection.
Repeai-
stePS
B
and
Q.
Several
su(rh
'rials
nay be necessary
to
obtarn the
desired
pickup
polnt.
11.
Turn the temporary
rheostat
to
give
the
desiitxi
voitage
for transfer
of
load
from normal
line
to
the
generating
plant.
12,
Turn
the
drop
-out
control
slowly
clockwise
until
the
relay contacts
open.
This
will
establish
the
point
at
which
transfer
is made
from the
line
to the
generator.
The
drop-out setting
is adjustable
from 5%
to
77%
below
the
pickup
voltage.
13.
Scribe
a
reference
line
to indicate
the
final
adjustment
of
each
adjusting
screw
for
future
reference in case
of
accidental
change
in the settings.
Replace
the
protective
caps
on
the adjusting
screws
without
turning
the screws.
14.
Disconnect
the temporary
rheostat
and
voitmeter. Re-
connect
wire
as
in
Step
j.
15.
Remove
jumper
wire
(installed
in Step
2)
from
N'O and
C
terminals.
Over-Voltoge
Reloy:
f)etermines
over-voltage
required before
the
Joad transfer statts
the
generating
plant and connects
it to the
load.
Adjust
by
following the
procedure
for
low
zoltage
relays
(except
that a
vgltage
source
is required
eEtal to
the specified
over-voltage
condition).
The relay
should
be adjusted
to
pickup
at
the specified
over-voltage
condition
and drop
out
when
the
line voltiage
drops
to
about
tf
nonnai
vaiue.
Plant
starttng
is attiustable
irom
105%
tr:
175v"
oi
normal.
TIME
DELAY.RELAY
Two
types of tirne
delay-relays
Bre used
with
Onan
load
transfer controls,
depending
on the
length
of
delay
and
its
f unction.
1.
The Agastat
Pneumatic Delay-Relay
(Fig.
able
from
l-second
to
10-'minutes.
Time
either
on energization
or de-energization
relay uses.
2.
The
Hagen
Synchronous
Clock
Delay-Relay
(F'ie.
19).
Delal'
occurs
on energization
and
is
adjustable
from
2
to 6(fminutes.
Agostol
Reloy Adiusiment:
This
relay
obtarns
its
time
delay
by
controlling
the flow
of
air
from
an
enclosed
cylinder.
To
change
the delay setting,
turn
the slotted screw
(on
top
of telay-\ clockwise
to increase
delay,
counterclcckwise
to
decrease
it.
Adjustment
requires
onlv
a
small
movement of
the screw.
CAATION:
Do
not force /fie
screw
too
lar to the
ight
(cloc*wise).
?"hi.s
damages
the needle'and-seat assembl;'.
iVhen
time
delay
is
adjusted,
check
lhe result
by r:onnttting
to
an
ac
power
source
of
the
proper voltage.
'lime
tire
18)
is
adjust-
delay
can
be
depending
on
ADJ
USTING
SCREW
FIG. IE FlG.
l9