Eaton Cutler-Hammer AMPGARD User manual

Effective 6/98
I.B. 48017
Cutler-Hammer
Instructions for Converting AMPGARD™Type LFM
Isolation Switch With Type 25LFR2 Design
This kit was specifically designed to replace old type LFM
isolation switches supplied prior to July, 1975, with new
type 25 LFR2 isolation switches. The shutter assembly
has been moved from the isolation switch to the starter
cell. This provides an insulating barrier over the line stabs
when the isolation switch is removed from the enclosure.
This industrial type control is designed to be installed,
operated,andmaintainedbyadequatelytrainedworkmen.
These instructions do not cover all details, variations, or
combinations of the equipment, its storage, delivery,
installation,checkout, safe operation, or maintenance.
Care must be exercised to comply with local, state, and
national regulations, as well as safety practices, for this
class of equipment.
Make certain that the incoming line breaker is locked open
and the connections to the line stabs have been de-
energized before any work is started on removal of old
parts.
Also check all auxiliary power circuits into the enclosure.
REMOVAL OF OLD PARTS
1. Rotatetheisolating switch handle counter-clockwise
90°tothe open-door position.
2. Loosendoorfastenersand open doors.
3. Remove the main power fuses and the contactor
phasebarriers.
4. Remove the contactor from the enclosure per instruc-
tionsinI.L.11-202-14under“Maintenanceand
Repair”.
5. Remove two .312 inch-18 x 1.00 inch Allen head cap
screws holding the isolation switch in place. Save
hardware.
6. Disconnect the auxiliary switch connections from the
terminal block if an auxiliary switch was originally
supplied.
7. Slide the old isolation switch out of the enclosure.
8. If any mechanical interlock linkage was supplied as
part of the original isolation switch, this linkage should
be transferred to the new switch using the holes
provided. Special care must be taken to properly
adjust the linkage so the complete mechanical
interlock system functions as originally intended.
9. See Fig. 1. Remove the 16-inch long glass polyester
line stab finger barrier that is held in place with two
.312inch-18 hex bolts. Dispose of the hardware and
thefingerbarrier.
Fig. 1 Existing Line Stab Finger Barrier

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INSTALLATION OF NEW PARTS
1. See Figure 2. Drive the four #12-14 x 2.00 inch thread
cutting screws into the holes provided in the new line
stabmolded barriers. (Twoin each molding) Back
these screws out approximately .250 inch.
Fig.2 New Line Stab Molded Barrier
Fig.4 Enclosure Front View
2. See Fig. 3. Install the L.H. line stab molded barrier to
the line stab support molding using two .250 inch-20 x
.62 inch hex bolts, lockwasher and flat washer from
the kit.
3. See Fig. 3. Attach the right-hand line stab molded
barrier under the .312 inch-18 x .62 inch hex bolt,
lockwasher and flat washer from the kit. Do not
tightenthishardware.
4. Use the shutter assembly as a template to correctly
positionthe right-hand line stab moldedbarrier. Place
the keyholes over the heads of the #12-14 x 2.00 inch
screws and drop into place. Tighten the .312 inch-18
hardwaresecurely.
5. Remove the shutter assembly.
6. Assemble the .125 inch thick top rear finger barrier
(4.88wide)and the bottom rear barrier(3.50inch
wide). Select the top and bottom barriers (3.88 inch
wide)(depending on thetype of cutoutrequired, if any)
and snap into place.
7. Mount the shutter assembly by again placing the
keyholes over the #12-14 x 2.00 inch screws. Drop
into place and tighten the #12-14 x 2.00 inch screws
securely.
8. Locate and drill one .257 inch diagram hole in the top
front channel of the cell as shown in Figure 4.
Fig. 5 Shutter Operating Lever Assembly
Fig. 3 Existing Line Stab Barrier Assembly
9. See Figure 5. Drop the keyhole slot in the end of the
shutteroperating lever over theheadof the shoulder
bolt on the shutter assembly.
Top FrontChannel
.250-20HexNut&Lockwasher
.375-16x1.12 Fil.Hd.
ShoulderBolt
ShutterOper.
Lever
.375-16 Flexloc
Roller must be
free to rotate
7.75
.03Approx.

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Effective 6/98
10. Assemble the shutter operating lever to the top front
channel using the shoulder bolt, .250 inch-20 hex nut
andlockwasher in thepreviously drilled .257 inch hole.
Note that the shoulder bolt is assembled in the
second hole from the end of the shutter operating
lever with a 7.75 inch dimension to roller.
11. Check that shutter is free to move when latch is
released. Rollershould rotate freely onshutter
operatinglever. Shutteroperatinglever should be free
of friction.
12. TheType 25 LFR2 isolation switch should have a light
coatingorsilicone grease (W 53846BU orDow
Corning#4 Compound) on thecontactarea of the line
stabs. This lubrication makes the switch easier to
operate and protects the contact surfaces.
13. Slide newType 25 LFR2 isolation switch into the
structure and secure with .312 inch -18 x 1.00 inch
socket head cap screws from the old unit. Connect
auxiliary switch leads to the terminal block, (if used).
14. Replace contactor in the structure. Push in firmly to
engage stabs. Replace the three .312 inch -18 bolts
connecting the contactor load terminals to the current
transformers.
15. Replace the multi-point low-voltage control plug in its
receptacle on the right-hand side of the contactor.
16. Replace thecontactorphase barriers and the motor
starting current limiting main fuses.
17. Before energizing starter, be sure themechanical
interlock between the isolation switch and the
contactorfunctions as described inI.L. 11-202-14 and
I.L.16-200-21.
18. Refer toI.L. 16-200-21 for isolation switch interlock
adjustmentprocedure.

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Effective 6/98
PrintedinU.S.A./CCI
Cutler-Hammer
221 Heywood Road
Arden, NC 28704