Westinghouse SJA - User Manual

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
Courtesy of NationalSwitchgear.com

Summary

Application

Application Safety Caution

Warning about potential system failures and the need for manual tripping when using latched contactors.

General Operation

Installation

Check-out Procedures

Mechanical Check-out

Verification of the mechanical latch assembly's free movement and proper operation.

Electrical Check-out

Verification of electrical circuits, including the coil clearing contact and automatic de-energization.

Maintenance and Troubleshooting

General Maintenance Guidelines

Establishing a maintenance program and determining inspection frequency based on duty.

Troubleshooting: Failure to Latch

Diagnosing and resolving issues where the contactor fails to latch closed after energization.

Troubleshooting: Failure to Unlatch

Diagnosing and resolving issues where the trip solenoid fails to unlatch the mechanism.

Troubleshooting: Failure to Remain Latched

Diagnosing and resolving issues causing nuisance unlatching of the contactor.

Westinghouse SJA Specifications

General

Brand	Westinghouse
Model	SJA
Category	Industrial Equipment
Language	English