GE Industrial Solutions PowerVac PV-VL 13.8-1000-0 and -1 - Manual (Page 7)

GEH 6468A - Power/Vac VL Breaker Page 7
4. INITIAL INSTALLATION PROCEDURES
Although GE has made every effort to assure
interchangability and satisfactory interface with
existing equipment, older equipment and field
modifications made over the years, may require
additional procedures before the new vacuum
breaker can be installed in the cubicle.
4.1 DOOR WIRING INTERFERENCE
In some of the older GE Metal-Clad switchgear
units, the wiring from the door to the stationary
structure was run through a perforated steel wire
assembly grill. (Figure 1.)
As the new replacement breaker is elevated, the
front cover MAY interfere with the subject wiring
grill, approximately 4” to 6” before the final
connected position.
The front cover shield on the replacement breaker
is wider than all previous AM breaker units. Due to
the large forces required to operate the existing
stationary auxiliary switches, the operating
mechanism cannot be decreased in width.
If this condition exists, use the modification kit
shipped with the breaker and make the following
modifications to the switchgear cubicle.
1. Cut out the bottom section of the grill as shown
in figure 1 on page 12.
2. Cover the sharp edges with the edge protector
furnished with the breaker accessories.
3. Fold any wire back and re-tie with the furnished
wire ties.
4. Elevate the replacement breaker in accordance
with the instructions.
4.2 POSITIVE INTERLOCK TEST
PROCEDURES
The positive interlock system functions to prevent
closing the breaker contacts when the breaker is
being raised or lowered and prevents raising or
lowering the breaker when the breaker contacts are
closed. In most AM breaker Metal-Clad Switchgear
units, there is a breaker “Test Position” which
allows you to functionally test the breaker without
connecting to the bus. This position is usually about
5” out from the breaker being fully inserted into the
cubicle. When in the “test position”, a secondary
coupler cable must be used to connect the
secondary control circuits since the breaker is
fully lowered position.
The lower “Vee” notch in the positive interlock cam
plate allows closing and opening the breaker
electrically.
FOR IMPROVED SAFETY, IT IS
RECOMMENDED THAT THE ABILITY TO
FUNCTIONALLY OPER-ATE THE BREAKER IN
THE “TEST” POSITION BE ELIMINATED AND
THAT BREAKER FUNC-TIONAL TESTING BE
PERFORMED WITH THE BREAKER
COMPLETELY REMOVED FROM THE CUBICLE.
4.3 BY-PASS KIT INSTALLATION
(See Figures 2 & 7).
The ability to electrically close and open the
breaker in the “Test Position” is eliminated by
covering the lower Vee notch in the positive
interlock cam plate. Materials for accomplishing
this modification are provided in Kit #254-089
furnished with the new vacuum breaker. This by-
pass kit should be in-stalled on GE breaker cubicles
that have a lower interlock roller Vee notch on the
positive interlock cam plate. Some GE breaker
cubicles do not have this lower Vee notch on the
interlock cam plate. In that case, the by-pass kit is
not required. If addi-tional by-pass kits are required
for the remainder of the switchgear line-up, order
Kit #254-089.
WARNING: FAILURE TO FOLLOW THE
INSTRUCTIONS BELOW COULD CAUSE
A CLOSED BREAKER TO BE RAISED
TOWARDS THE CONNECTED POSITION,
CAUSING INJURY OR DEATH TO THE
OPERATOR AND EXTENSIVE EQUIPMENT
DAMAGE.
To make the modification proceed as follows:
1. Remove the existing clutch switch cover plate
and discard (save the mounting hardware).
2. Measure and record the distance from the
bottom of the cam plate to the bottom of the switch
operator bracket. See Figure 2.
3. Remove the existing switch operator bracket.
4. Install the new switch operator bracket supplied
with the kit, using the two existing ¼ - 20 screws.
Adjust the bracket in the exact same location as the
removed bracket, in relation to the motor activation
switch lever. Make sure that the lower notch in the
positive interlock cam plate is covered and that the
edge is even with the front edge of the positive
interlock cam plate. (Figures 2 and 7.)