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T Y P E CO CI R C U I T O P EN I N G R E LAY
s tationary contact s houl d have a m1mmum of
w i p e . T h e bridgin g m o vi n g contact s h ou l d touch both
stationary contacts simul tane ously.
ROUTINE MAINTENANCE
All relays should be inspected periodically and
the time of operation should be checked at least
once every year or at such other time intervals as
may be dictated by experience to be suitable to the
particular application.
Phantom loads should not be
used in testing induction-type relays because of the
resulting distorted current wave form which produces
an error in timing.
All contacts should be periodicallY cleaned.
1t
contact
burnisher
1 82A836H0 1
for this purpose .
The us e of abrasive material for
cleaning contacts is not recommended, because of
the danger of embedding small particles in the face
of the soft silver and thus impairing the contact.
CAL I B RATION
Use of the following procedure for calibrating the
relay if the relay has been taken apart for repairs or
the adjustments disturbe d .
not be used until it is apparent that the relay is not
in proper working order. (See "Acceptance Chec k " )
C O UNIT
1 . CONTACTS
a)
By turning the time dial , move th e m o ving con
tacts
until they defl e c t the stationary contact
to a position where
resting against its
l ocated on th e mo vement frame s h oul d coincide
With the " 0 "
mark
b )
F o r relays identifi e d with a "T " , l ocated at
l ow e r l eft of stationary c o ntact b l o c k , th e index
mark on the movement frame wil l c o incide w ith
" 0 "
the
mark on the time d ial when the s tation
ary
contact has
moved through approximately
one-half
of its
normal
with th e s tationary contact resting against the
backsto p , the index mark 1s offset
"0"
the
mark
by
placement of the vanous time dial positions m
line
with
the
i nd e x mark w il l
times as shown on the res pective time-current
curves.
2. MINIMUM TRIP CURRENT
The adjustment of the spring tension in setting
1/32"
is
recommended
This procedure should
the stationary c ontact is
backstop. The
index mark
the
on
time dia l .
defl ection . Therefore ,
to
the right of
. 020".
approximately
The
give operatin g
the minimum trip current value of the relay is most
convenientlY made with the damping magnet removed.
With the time dial set on "0 " , wind up the spiral
spring by means of the spring adjuster until approxi
matelY 6-3/4 convolutions show.
Set the relay on the minimum tap setting , the
time dial to position 6.
+
Adjust the control spring tension s o that the
moving contact will leave the backstop at tap value
current
l . Oo/c and will return to the backstop at tap
value current - 1 . 0% .
A
3 . TIME C URVE CALIBRATION
Install the p ermanent magnet.
Apply th e indicated c urrent p er Table
manent magnet adjustm ent (e. g. C0-8, 2 times tap
valu e ) and m easure the operating
permanent
magnet keeper until the operating time
corresponds to the value of Table I .
ApplY the indicated current per Table I for the
electromagnet plug adjustment (e . g . C0-8 , 20 times
tap value ) and measure the operating time.
the proper plug until the operating time corresponds
to the value in Table I.
plug, front view , increases the operating time and
withdrawing the right hand plug, front view , decreases
the time. ) In adjusting the plugs, one plug should b e
screwed i n completelY and the other plug run i n or
out until the proper operating time has been obtained.
C0- 1 1
F o r ty pe
val ue operating time from the number
tion is 54.9 ±5% se conds . It is important that the
times tap va l u e current be maintained accurately . The
maintaining of th1s current accurately 1s neces sary
becaus e
of the steepness of the s l ope of the time
current
characteristic ( F 1 gu re 9.
1 . 30
the
times ta p va l u e c urrent ( including mea surin g
mstrument d eviation) w i l l change the nominal ope ra
tin g time by approximately 4%.
1 . 3
at
tim e s tap val u e is not within the s e l imits , a
minor adjustment of the control s pring w i l l give the
c orrect operating time without any undue effect on
the
minimum p ick-up of the relay . This check is to
be made after the
been completed.
Recheck the permanent magnet adjustment.
the
operating time for this calibration point has
change d ,
readjust the permanent magnet and then
recheck the electromagnet plug adjustment.
I
Adjust the
time .
(Withdrawing the left h and
1 . 3 0
relay o n l y , the
times tap
6
time d ial posi
A 1%
variation in
If
the operating time
2
times tap val ue adjustment has
for per
Adjust
1 . 30
If
1 5
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