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POTENTIOMETER DESIGNATION
b)
Reduce voltage VT until continuity tester indicates that the
main output contacts are closed.
80% of this voltage and maintain at this value.
c)
Turn potentiometer P2 clockwise until the
indicates that the main output contacts are open.
d)
Alternately
that output contacts are open for values of IT sl1ghtly less,
and closed for values of IT slightly more,
sensi ti vi ty setting.
for values that are 10%
setting) .
e)
Change
through d) except use potentiometer P4 for adjustment.
f)
Change
through d) except use potentiometer P6 for adjustment.
Note:
In
order
supervision to a value near the low end of the setting range
given in Table IV,
restraint setting to a very low value.
shown
in
Figure
not be necessary.
Tests (Type
MOB
7.
There are two timer adjustments on the "SP" card for setting the
MOB function.
These adjustments are listed in Table XVII.
POTENTIOMETER
DESIGNA T ION
P7
Characteristic
P8
The test circuit for checking either of these timer settings is
shown
in
Figure
"CHARACTERISTIC TIMER" is as follows:
a)
Connect Channel One of the oscilloscope to test point "BIN"
on the "IT" card.
with positive slope.
GEK-49861
TABLE XVI
OVERCURRENT SUPERVISION ADJUSTMENT
P2
P4
P6
raise
and
connections
to
connections
to
to
set
the
it may be necessary to change the relay
31
Figure
is
SLY81B
24,
this change in the relay restraint
only)
TABLE XVII
MOB FUNCTION ADJUSTMENT
T IMER
ADJUSTMENT
FUNC T ION
RANGE
(MILLISECONDS)
2 -
Duration
33
27.
The
recommended
Trigger the oscilloscope from this channel
ADJUSTMENT FOR PHASE PAIR
Reduce VT to approximately
lower
current
{The output contacts
higher than the desired sensitivity
phase
pair
BC
phase
pair
CA
sensitivity
used
in
place
s
HZ
60
so
FAC T ORY SETTING
MILLISECONDS
3
67
-
procedure
24
AB
BC
CA
continuity
IT
slightl :f
and
than the desired
should be closed
and
repeat
steps
and
repeat
steps
of
the
overcurrent
If the test circuit
of
the
one
shown
setting will
SO HZ
RELAY
RELAY
FAC T ORY SETTING
MILLISECONDS
3.6
60
for
checking
tester
check
a)
a)
in
the
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