(a) Check each individual contact at its
edge (insert A) with a force gauge. Preload should
be between 1-1/2 -2 1/2 lbs. This can be attained
by adding or removing shim (see chart, figure 6-1A).
(b) Preload is checked by the initial
breakaway of the E ring at point B, figure 6-1A.
Preload should be between 1-1/2 to 2-1/2 lbs. This
can be obtained by adding or removing shim (See
chart, figure 6-1A).
(2) After assembly of the actuator assembly
(64, figure 6-l), refer to figure 6-lB and per-
form the following adjustment procedures
(a) Leave four screws (1) loose.
(b) Clamp assembly at points A and B to
assure no-air gap at points C and D.
(c) With assembly clamped, tighten four
screws (1).
(d) Remove clamp.
(e) Insert feeler gauge (0. 150 + 0.010 in.)
into movable core gap and adjust guide screws (2)
evenly until gauge is snug throughout the parimeter.
(f) Secure after adjustment by tightening
two nuts (3).
(3) Contactor adjustment.
(a) Contact overtravel. Refer to figure
6-lC and proceed as follows:
(1) Attach indicator lamp on ohmeter to
terminal A1-A2 & C1-C2.
(2) Insert 0.035 gauge into movable
core cap (A).
(3) Apply 24 VDC to coil.
(4) Adjust carrier bushings at point (B)
until continuity is made on A1-A2 & C1-C2.
(5) Secure by tightening nuts (l).
(6) Recheck continuity at 0.035. No
continuity at 0.040 readjust if necessary.
(b) Economizing switch. Refer to figure
6-lC and proceed as follows:
(1) Adjust switch bracket (3) to
transfer switch. Check that white button is fully
depressed and allow approximately 0.010 clearance
between white button and tap operator (point C).
Secure screws on bracket.
(2) Insert 0.010 gauge into movable core
gap (A).
(3) Apply 24 VDC to coil.
(4) Adjust lower tap (D) by bending to
transfer switch.
(5) Recheck
0.010 gauge transfer
0.018 gauge no transfer
Readjust if necessary
(c) Auxiliary contacts. Refer to figure 6-lC
and proceed as follows:
(1) Before adjustment, set lift comb item
(5) so that the deflector on the guide leaf springs
(6) are near equal in energized and de-energized
position. Secure by tightening nuts (4).
(2) Normally closed. Insert 0.018
guage between guide rod head and operator plate,
(point D 2 places).
Adjust stationary contacts to
just touch the movable contact (use indicator light) -
recheck with 0.025 gauge at point (D). No continuity.
Readjust if necessary.
(3) Normally Open. Same as normally
closed except shims are inserted into movable core
gap (point A).
Change 1 6-4A
