Westinghouse SJA Wiring diagram

Supplementary Instructions for
Mechanical Latch Attachment
for
Type SJA or SJO Contactor
Single or Dual
Trip, 360 Amp~re
I. L. 16·200-35A
•
Fig. 1 Type SJO with Latch Attachment
APPLICATION
trip the latch arm -when energized -by pushing the
·ra:tch arm down (below the armature), allowing the con-
t11ctor armature to move into the open-contacts position.
The latch arm has a r0ller-bearing cam )ll'heel
on the
end
'that engages the armature so· that .. friction is
minimizec;I and the trip action is fast.
The contactor coil and trip solenoid coils are Inter-
mittently rated and will burn-out if energized contin;
·uously,
there are many possible operating schemes
and diagrams, and the installer should check the oper.
ation of the latch against the specified diagram
for. the
specific application.
1.t Is recommended that the coils
be automatically de-energized by auxiliary contacts on
the contactor itself, without depending
on supplemen·
tary relays elsewpere. · .
· ·The latch sensitivity
is adjustable. If unlatching occurs
accidentally from vibration
or impact, the sensitivity
. should be decreased.
If either unlatch solenoid fails to
trip the latch when rated solenoid voltage
is .applied,
then the sensitivity should
be increased. Refer to the
.·seotiofr
on MAINTENANCE. ' . .
',1-:·'-
·. · .. ' TABLE I - COIL INRUSH DATA
~
.Coll Function Rating
Volt~Amperes
Close contactor
110-120 VAC 1300
Close contactor
220-240 VAC .
1400
Close contactor 125 VDC
1500
Close contactor
250 VDC 1600
Open contactor AC
225
·.·
Open ~ontactor
24 voe ·
600
Open contactor
4896 voe 190
'
';
Open contactor
125 VD.C 300
Open contadtor 230 VDC
265
INSTALLATION
This industrial type control is designed to be installed,
operated, and maintained
by adequately trained ;per'
sonnel, with adequate supervision. These instructions
do not cover all details, variations,
;or combinations, of
the equipment,
Its storage, delivery, '>installation,
checkout, ·safe operation, dr maintenance. ·Care
must.
be exercised to, comply with local, st'ate, and national
regulations, as well as safety practices, for this,class
of equipment.
WARNING: ALL. WORK ON THIS .. CoNT:ACTOR
SHOULD BE DONE. WITH THE. MAIN DISCO.NNECT
DEVICE OPEN. AS WITH ANY CONJACrOR OF'THIS
VOLTAGE CLASS, THERE IS DAN~ER OF ELECTRO·
CUT ION AND/OR SEVERE. BURNS, MAKE CERTAIN
THAT POWER IS OFF' .
. I
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MECHANICAL LATCH FOR 360A SJ
TWO SLOTTED HOLES
l.L. t6-200·35A
HOLE IN LATCH
MOUNTING FOR
(BOTH
SI DES) ".
NOTE: LATCH ARM SHOWN UN-LATCHED 1(2")
5259C56
Fig. 2 Mechanical Latch Assembly
Figure 2 shows a latch assembly before it is mount-
ed
on a contactor. The enlarged detail shown in Figure
3 shows the relationship betwee.n the cam roller
on the
end of the latch arm anda notch in the lower left corner
of the contactor armature. When the latch
is installed,
it appears
as shown in the lower portion of Figure 3.
Latch sensitivity can be understood by studying the
inset of Figure
3, which is a magnified detail view show-
ing the lower left corner of the armature and the cam
roller. The cam roller travels between positions
(U) and
(L) through a 6112'' radius arc around the latch shaft. This
is the radius of the latch arm.
In the unlatched (open)
contactor position, the cam roller
is in position (U). It
cannot travel upward to position (L) even though the
latch spring
is pushing the latch arm upward because
latch edge
(F) of the armature stops it. However, when
the contactor operating coil
is energized, the armature
rotates toward the magnet and latch edge
(F) travels
across the cam roller easily.
As latch edge (E) passes
the centerline of the cam roller, the' roller starts moving
upward, driven by the latch spring. By the time the
armature reaches the magnet, the cam roller passes
completely
by latohcedge·(E) into position (L), and the
contactor
is latched closed. ·
2
The cam roller cannot travE;JI to the top of the notch
in the armature because the latc.h arm stops against
the latch adjustment bolt. The further into the notch the
cam roller penetrates, the, less sensitive the latch
becomes.
There will always
be some "backlash" clearance be-
tween the contactor armature and magnet in order to
provide free motion. This only needs to be a few
thousandths of an inch; so for practical purposes, the
contactor
is held "fully" closed.
When either or both trip solenoids are momentarily
energized, their armatures.·push the latch arm
downward against its spring;
As the centerline of the
cam roller passes below latch edge
(E) of the armature,
the contactor armature will snap to the fully open
position;
i.e. the contactor is open.
Ifthe latch has been de-sensitized with
an adjustment
that allows the cam roller
to travel high into the armature
notch when latched, the trip solenoids have
an in-
creased resistance to their push.
In a poorl¥ adjusted
latch, this may prevent tripping at
80% of trip sole~oid
voltage, in which case the latch must be made more
sensitive.
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MECHANICAL LATCH FOR 360A SJ
SIDE VIEW
5259C57
Fig. 3 Mechanical Latch Installed
CHECK-OUT, MECHANICAL
Refer to the Instruction Leaflet relating to the
electrically-held contactor
l.L. 16-200-32 or l.L.
16-200-33.
Make sure all power circuits are de-energized and/or
isolated. The contactor can
be checked in its enclosure
or outside. If the starter is a new factory assembly it is
probably easiest to test the contactor as Installed. Any
mechanical Interlocks
must be checked as Installed,
to make certain that safety interlocks function properly.
If the contactor
is checked in Its enclosure, make cer-
tain that the contactor coil
is electrically isolated, to
prevent feedback into a control transformer that could
be hazardous.
With
an extension cord and a separate power source
of correct voltage, connect power to the coil of the con-
tactor. Operate appropriate pushbuttons to close. If the
contactor does not close fully, refer
to MAINTENANCE.
3
LL •. 16~200·35A
~RCJNT VIEW SPACING WASHERS
The contactor should automatically latch and stay
closed. Make sure that the coil clearing contact
automatically removes control circuit voltage after the
contact
Is closed, to prevent coil burnout.
While the contactor
is closed, observe the overtravel
gap between the pivot plates on the crossbar and the
underside of the lower bottle nut
on each pole. This
overtravel gap should
be no less than .070 Inch when
the contactor
Is new. If less, refer to MAINTENANCE.
Note: When a contactor is latched, it has a small
amount of "backlash"
to Insure freedom of
motion. The armature is not sealed againstthe
magnet as
In an electrically-held contactor.
Therefore, the full
.075 inch overtravel specified
for
an electrically-held contactor cannot be
achieved.
While the contactor
is closed, operate the manual trip
arm:
to assure that the unlatch mechanism functions.
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MECHANICAL LATCH FOR 360A SJ
Effective 1/86
Supersedes 16-200-35
(11/83)
Westinghouse Electric Corporation
Control Division
Asheville, N.C., U.S.A. 28813
1.L. 16·200·35A ·
Printed In USA
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MECHANICAL LATCH FOR 360A SJ
Reclose contactor, and trip it electrically using each
trip solenoid separately. Checkthe coil clearing auxiliary
contact to make sure that each solenoid
Is de-emirglzed
automatically after operating, to prevent solenqid coil
burnout. There should
be no voltage between the ter-
minals of each trip solenoid coll after the contactor has
been opened. When tripped,
t~e latch should move
briskly.
If it Is sluggish, refe( toiMAINTENANCE.
CAUTION! A latch Is somewhat like a mousetrap.
Use care to protect
fi)1gers in the event
of
an accidental trip during check-out.
CHECK-OUT, ELECTRICAL
Refer to ,the instructions for the electrically-held
contactor. '
MAINTENANCE
A maintenance program .should be established as
soon as the contactor is in¢talled and put into opera-
tion. After the contactor has been inspected a number
of times at monthly intervals, and the condition noted,
the frequency of inspecfion · can
be increased or
decreased
to suit the conditions found, since this will
depend upon the severity of the contactor duty: It
is a
matter of operator judgement. ' ·
Failure To Latch Or Unlatch·
First, establish that the latch operates freely without
mechanical Interference. (The ·contactor can
be op-
erated electrically with
an ext.e.nsion cord, as described
previously under
CHECK-OUT, MECHANICAL. Or it
can
be operated by hand (1) with a wrench on the end
of the contactor shaft,
(2) by pushing down on the top
rear edge of the contactor crossbar, or
(3) in the case
of
an SJA contactor, by turning the yoke interlock arm
on the stub shaft clockwise;)
Remove )he
lat.ch spring. Block the bottom solenoid
open temporarily'witha pencil
or oth,E)r shim on top of
Its magnet frame. and underneath Its armature. Hold the
contaotor in the fully sealed-closed position by hand or
electrically, and manually close/open the latch using the
trip arm.
Th.a latch should move easily. If it does not
move freely,'check the roller end
of the latch arm to see
ifthe latch arm rubs againstthe armature.
To eliminate
rubbing, loosenthe two latch mounting bolts
(B) (Figure
3) on the right side and move the right latch bearing
plate rearward until the latch arm clears the armature.
Re-tighten the mounting bolts. Re-check for free motion.
Next, hold the contactor
In the fully sealed;closed
position, operate the latch with the trip arm, then release
the trip arm abruptly. The latch should fall freely into
the open position.
If it doesn't, the "backlash" clearance
is insufficient.
To increase the clearance, loosen all five
latch mounting bolts
(A) and (B) (Figure 3) and tap both
the left and right bearing plates rearward a few thou-
sandths of
an inch. Re-tighten the five bolts and re-
check both the free-fall release and the freedom from
rubbing between the latch arm and the armature.
Re-install the latch spring. Check the overtravel of the
main vacuum Interrupters, since increasing "backlash" ·
decreases overtravel. Overtravel must not
be below .020 ·
inch ·with worn contacts.
Remove the blocking shim from the bottom trip ·
solenoid. Check that both solen0id armatures move .
freely.
Failure To Latch
After making adjustments as outlined In the previous .
section, operate the contactor electrically. If
it fails
to
latc.h: ·
a. Qheck voltage applied to the contactor coil to be ·
sure it is within 80% of coil rating. '
b. Check setting of the L-63 normally'closed coll .
clearing auxiliary contact
to see if It opens too soon •
and does not allow the contactor to close
.. far'
enough to latch.
c. Make certain that the late~ spring is properly i
in place.
d. Decrease the sensitivity of toe latch by loosening:
the lock nut on the latch adjustment and backing-·
off(unscrewlng) the latch adjustmentbolt one-half.
turn.
Try again, and if latching is not successful,
back-off another half-turn,
etc. until the latch works.
Re-tighten the lock nut.
Failure To' Unlatch
After making adjustments as outlined in the previous ·
two sections, operate the contactor electrically. If the :
trip solenold(s) do not unlatch the mechanism:
a. Check voltage applied to the solenoids to be sure ·
it
is within 80% of rated voltage.
b. Check each solenoid coil for continuity. Replace ·
If burned open. See Table II.
c. Make certain there is an airgap under each·
solenoid armature of .120 to .130 inch wh\)n the :
latch
is latched. If there is no gap, the solenoid
armatures cannot move
to push the latch arm.
d. Increase the sensitivity of the latch qy loosening:
the lock nut
on the latch adjustment and tighten- ·
ing (turn bolt clockwise) one-half tum.
Try again,:
and if unlatching
is not successful, turn bolt I.
another half-turn, etc. until the solenoids unlatch '
dependably. Re-tighten the lock nut.
Failure To Remain Latched
If nuisance unlatching occurs, de-sensitize the latch
adjustment as described under
Failure To Latch.
.
TABLE II - REPLACEMENT SOLENOIDS
Trip Coll
Intermittent
Rating
115-120 VAC, 48 VDC
230-240
VAC; '96-125 VDC
460-480 VAC, 230 VDC
575-600
VAC
24 VDC
Trip
Solenoid
Part No.
5259C46G01
5259C46G02
5259C46G03
5259C46G04
5259C46G05
4
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