GE Industrial Solutions Limitamp AR User Manual
GE
Industrial Solutions
Limitamp® AR: Installation Guide
CR 194 One/Two-High Vacuum Limitamp® AR Control
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Table of Contents
Introduction ..............................................................................................3
Opening High Voltage Door .................................................................3
High-Voltage Door Latches .................................................................4
Isolation Switch Handle to Contactor
Mechanical Interlock ..............................................................................5
High-Voltage Door Defeater Latch....................................................6
Low-Voltage Box Wiring Details .........................................................7
Plenum Installation Guide ....................................................................7
Turned Extension Plenum Installation Guide (Front/Rear) .....10
Turned Extension Plenum Installation Guide (Top/Bottom) ... 11
Limitamp AR Extension Plenum ...................................................... 13
Extension Plenum - General Guidelines ........................................ 14
Cable Entry From Top or Bottom ....................................................16
Dimensions ............................................................................................ 16
CR 194 One/Two-High Vacuum Limitamp® AR Control Page 2
Introduction
GE’s Limitamp® AR is the solution for applications where an
extra margin of protection is essential. It meets the IEEE
C37.20.7 Type 2B and IEC 62271-200, TYPE-A standards and is
available in one- and two-high versions of FVNR motor
starters, rated for 2.4-7.2kV-400A, 5kV-800A.
This instruction book is to be used in conjunction with GEH6263 (Two high vacuum equipment), GEH-5306 (vacuum
contactor) and GEH 5396B (800A) instructions.
Figure 1. 36”
wide Two-High
AR FVNR starter
with low-voltage
doors open.
WARNING: Before any adjustments, servicing, parts
replacement or any other act is performed requiring
physical contact with the electrical working components
or wiring of this equipment, all power must be removed
and locked off from all sources and all attached rotating
equipment must have come to a complete stop. User
personnel must be completely familiar with the following
operating and maintenance instructions before attempting
to service this equipment.
WARNING: The vacuum interrupter integrity test should be
performed before the high voltage vacuum contactors are
energized for the first time and each time the contactors
are returned to service after maintenance, adjustment or
repair. Failure to perform this test may result in serious
injury or death.
CAUTION: Product is not intended for nuclear use.
Opening High-Voltage Door
The high-voltage doors on the CR194 Two-High Vacuum
Limitamp AR are mechanically interlocked to prevent the
opening of the doors, when equipment is energized. For
safe opening of high-voltage door, follow the step-by-step
procedure as mentioned below.
Step 1: Push in the handle latch release and rotate the
isolation switch handle to the full “OFF” position. The latch
release must pop back out. See figure 3.
Step 2: Rotate the handle (Black color handle) down with a
rapid positive motion, to bring it to “OFF” Position.
Step 3: Rotate the high-voltage door latch handle (silver color)
90° in the counter-clockwise direction to disengage the multi
latches on the inside of the door.
Step 4: Turn all flange nuts simultaneously until disengaged
from hat brackets.
Step 5: The high-voltage door may then be opened by pulling
out on the latch handle.
Figure 2. 36”
wide Two-High
AR FVNR starter
with high-voltage
doors open.
Figure 3. Push in
the handle latch
WARNING: Confirm that equipment is de-energized before
opening the high-voltage doors.
CR 194 One/Two-High Vacuum Limitamp® AR Control Page 3
Figure 4. Rotating
the high-voltage
door latch handle.
Locking Pins in
Unlocked Position
Latch Handle
Locking Pins in
Locked Position
Figure 6. View of locking pins on high-voltage door.
High-Voltage Door Latches
The Limitamp AR design uses special high strength door latch
parts to keep the door closed during an arcing event. All of the
latches must be properly engaged for the product to function
properly. On the outside of the high-voltage door there is a
door latch operating handle. Rotating this handle operates all
of the latch locking pins at one time.
The door latch locking pins are all adjusted prior to shipping
from the factory. If any of the door latch pins are moved or
replaced make sure they are adjusted per the sketch below.
Make sure to tighten the locking stud on the locking pin bridge.
When the door handle is in the locked position adjust locking
pin bridge to provide a 0.150” gap between the bridge and the
welded “U” fork on the door.
Locking Stud
.150
The mating part of the latch system is shown in the Figure 7
below. The enclosure side latch parts are mounted to the
frame using a stud plate that passes through the flange of the
case. The latch parts can be adjusted in all directions using the
slots in the latch parts and special spacers that mount under
the latch parts. The latch parts should be adjusted so the
locking pins on the door engage the open slot on the case side
latch part. The nominal position for the latch part is flush with
the front edge of the enclosure flange.
Latch Plates
Should Be
Flush With
Front Flange
of Enclosure
Figure 5. View to show gap between locking
pin bridge and “U” fork on the door.
CR 194 One/Two-High Vacuum Limitamp
Figure 7. View of enclosure mounted latch parts.
WARNING: Barriers or enclosure door latch parts removed
to service the equipment must be re-installed in the exact
location for safe operation. Not complying with this
instruction could lead to serious injury. Mark the location
of these items with the ink for ease of re-assembly.
®
AR Control Page 4
Isolation Switch Handle to Contactor
Mechanical Interlock
The Limitamp AR two-high vacuum starter is equipped with a
quick-make, quick-break isolation switch in each starter. This
isolation switch is not designed to make or break motor load
current. To insure that the isolation switch handle cannot be
operated when the contactor is energized, a mechanical interlock
mechanism is provided between the contactor and the isolation
switch handle. Operation of this mechanical interlock for each
starter should be checked per the following procedure.
WARNING: Confirm the equipment is de-energized before
performing this check.
Adjustment Nuts On
the Interlock Assembly
Step 1: Adjust the nuts to shift the connecting rod position as
shown in Figure 10.
Step 2: With the contactor open the connecting rod should be
adjusted up to a point where the pusher will pass through the
round hole in the connecting rod.
Step 3: Once adjusted tighten the two nuts against the block.
Connecting Rod Pusher Rod
Figure 10. Showing how pusher is unblocked when the contactor
is open.
Figure 8. View of the contactor to isolation switch
mechanical interlock at the vacuum contactor.
Figure 9. Adjusting connecting rod
Pusher Rod
Blocked
Figure 11. Showing how pusher is blocked when the contactor
is closed.
To verify that the interlock is properly adjusted push down on
the top of the contactor moving armature and hold it down.
Now attempt to press the handle latch release (pusher). The
mechanical interlock should prevent the handle release from
going in and prevent the handle from being moved.
CR 194 One/Two-High Vacuum Limitamp
®
AR Control Page 5
High-Voltage Door Defeater Latch
WARNING: The following steps should be taken only as a last
resort to enter a malfunctioning controller. It is imperative
that all power to main bus be removed before proceeding.
IN CASE OF EMERGENCY, remove all power to the controller,
then the high-voltage door may be opened with the contactor
in the closed position and with the isolation switch closed, by
following the procedure listed below.
WARNING: Do not proceed unless all power to the
controller is removed. In this situation, doors must not
be opened with power connected to the bus.
Door Interlock Defeater
Locking Nuts
Step 1: Remove the door interlock defeater locking nuts as
shown in Figure 12.
Step 2: Rotate the door latch operating handle 90° counter-
clockwise to disengage the multiple door latches on the inside
of the high-voltage door.
Step 3: Turn all flange nuts simultaneously until disengaged
from hat brackets.
Step 4: The high-voltage door should be able to be opened by
pulling out on the silver handle. As you pull on the door, the
door interlock defeater will pull away from the door.
WARNING: Defeating high-voltage door interlock leaves
the power fuses and contactor connected to the bus.
The bus power must remain de-energized while the
high-voltage door is open.
Door Interlock Defeater
Figure 12. View showing door interlock defeater locking nuts. Figure 13. View showing door interlock defeater.
CR 194 One/Two-High Vacuum Limitamp® AR Control Page 6
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