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I
.
L
.
41
-
668
.
IE
ADJUSTMENTS AND MAINTENANCE
Troubleshooting
Use the
following procedure
to
locate the
source
of trouble in the
event
of
improper relay operation
.
1
.
Inspect
all wires and connections
.
The
proper
adjustments
to
insure
correct
oper
-
ation of this
relay
have been made
at
the
factory
and
no
further
adjustment
should be
required
.
2
.
Check
resistances
as
listed in the electrical
parts list
.
Acceptance
Tests
The
following
check is recommended
to
insure
that the
relay
is in proper
working
order
.
All
checks
can
best be
performed by connecting
the SGR
-
51
as
shown
in
Figure
5
,
with the cal -
operated
switch
in the operate
position
and the
reset
timer knob
ro
-
tated
to
the 3
-
second
position
.
3
.
Check
voltages
or
waveforms
as
listed under
electrical
checkpoints using
a vacuum
tube
voltmeter and
/
or
an
oscilloscope
.
Electrical Checkpoints
Apply
rated
voltage through
a
switch to
relay
terminals 8 and 9
.
Terminal 9 is
positive
.
Push PB - 1
to
close
relay
B
.
Immediately
thereafter
,
push
PB - 2
. Relay
B
should
trip
open
and remain locked
out
.
Set the
reset
time dial for 15 seconds
.
Apply
rated voltage
to
the
relay
to test
the
circuit board .
Reclose
relay
B
by pushing
PB
-
1 . After
3 or
more
seconds
, push
and hold
PB
-
2
.
Relay
B should
trip
open
,
reclose
,
trip
open
and remain locked
out .
Apply voltage
before each
testpoint
otfeck
,
and
interrupt
it after
each check
. Take testpoint read
-
ings
before and after
the
reset
time shown
on
the
time dial .
Calibration Check
The
following
procedure may
be used
to accu -
rately
check
the time dial calibration .
Use the
following
table
to
determine the
correct
voltages
or
waveforms
at
the indicated
point
.
Refer
to
Figures
6 and 7 for circuit board component
layouts
.
With the cal
-
operate
switch
in the cal
position
,
apply
rated
voltage
. Push
PB - 1
to start
the timer
.
The CR
contacts
should close
to
stop the timer
after the time
set on
the reclose
timer
has
elapsed .
RENEWAL PARTS
Repair
work
can
be done
most
satisfactorily
at
the
factory
. However
,
interchangeable
parts
can
be
furnished to
the
customers
who
are
equipped
,
for
doing repair
work . When
ordering
parts
,
always
give complete nameplate
data .
Routine Maintenance
All
relays
should be checked at least
once
every year
or
at
such other intervals
as
may
be dic
-
tated
by experience
to
be suitable
to
the
particular
application
.
4
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