I.B. 48020
Page 2
Effective 4/00
INSTALLATION
The mechanical latch kit is supplied as shown in Figure 3.
The kit consists of two main components: the main latch
assembly and the roller bracket and bearing assembly.
Hardware for bolting the assemblies to the SL contactor is
also included. The contactor moving armature is not
supplied with the kit. It is shown for illustration purposes
only, to identify the mounting location of the roller bracket
and bearing assembly.
Steps for Installation
1.
Remove the existing roller bracket from the contactor
moving armature, if one is attached.
2.
Secure the new roller bracket and bearing assembly
with two 6mm x 25mm bolts with lock washers and
torque to 85 in-lb (9.6 N-m). Insure that the side
flanges of the roller bracket are parallel with the end of
the armature plate. Note: If bolts longer than 25mm are
used, they will extend through the armature plate and
prevent the contactor from closing and sealing when
the main coils are energized.
3.
Locate latch assembly into contactor, see Figure 4
4.
Install four 8mm x 1.25 bolts 16mm long, with lock
and flat washers through the bottom of the contactor
base plate into the latch base plate, do not tighten at
this time.
5.
With contactor energized, place a 0.5mm ( 0.020 in.)
feeler gage between roller bearing and rotating cam on
latch assembly, see Figure 5
When releasing the latch several parts of the contactor will
move with considerable force. Use caution to insure
fingers are not pinched as the contactor is forced open by
the return spring.
8.
Route the two control wires from the full bridge diode
across the main coils, connecting them to the main
coil control wires with tie straps, and terminate them
at terminals 7 & 8 on the control board.
WARNING
DANGER
Follow necessary precautions including insuring that all
transformers are properly isolated before applying power to
contactor coil. If voltage is back fed into a transformer,
high voltages will be generated on the transformer primary.
High voltage can cause serious injury or death.
6.
Apply force to latch assembly, sliding cam towards
roller bearing, and tighten four mounting bolts through
contactor baseplate. Torque to 200 in-lb (22.6 N-m).
7.
Release the latch by depressing the latch release tab
on the latch assembly. Refer to Figure 5.
Figure 3: Mechanical latch kit
Figure 4: Location of latch assembly on contactor base
plate
Contractor Moving Armature
(not part of kit)
Roller Bracket and
Bearing Assembly
Main Latch Assembly
