Dings Dynamics Group 70 Series Hazardous Location - Manual (Page 7)

TORQUE ADJUSTMENT
(See Figure 2 & Table 4)
14. Adjust length of torque springs (7) to dimension “D” for
rated torque. To decrease torque, increase spring length
(“D” max =1-1/2”). Both torque springs must be adjusted
to the same length.
FRICTION DISC REPLACEMENT
(See Figure 2)
15. Remove cover screws (21) and cover (1).
16. Remove pivot stud (32), reset spring (37), drive gear (31),
drive spring (50), and driver (39). Unscrew release gear (34)
and remove release bearing (35). Remove gap adjusting nut
(2), reset spring (37) and drive spring (50).
17. Remove magnet plate (3). Take care not to bend control rod
assembly (45).
18. Remove gap adjusting nut (4), torque nut (5), washer (6) and
torque spring (7). Remove pressure plate (9). The friction
discs (10) may now be replaced.
19. Reassemble brake. Replace pressure plate (9), torque spring
(7), washer (6) and torque nut (5). Set spring length to
dimension “D” (Fig. 2). Assembly gap adjusting nut (4) and
magnet plate (3) taking care not to bend control rod assembly
(46). Set magnet gap to dimension “A” (Fig. 2 and Table 4).
20. Install two release bearings (35) into recesses of magnet
plate (3). Thread two release gears (34) onto release rods (33).
Turn release gears (34) clockwise until snug but do not raise
pressure plate (9). Make certain that release rods (33) are
seated in the pressure plate recesses.
21. Insert lock spring (42) and lock pin (41) in the underside of
the driver (39) and center the driver (39) on magnet plate (3)
at same time engaging lock pin (41) in lock bushing (40).
22. Insert pivot stud (32) into drive gear (31) and driver (39).
Line up marked teeth of release gears (34) and drive gear (31)
and tighten pivot stud into magnet plate (3). Install drive
spring (50) and reset spring (37). Check operation of manual
release mechanism. Mount brake cover (See Paragraphs 2 to
6).
23. Alternate method of lining up release mechanism if markings
not visible: Turn release gears (34) clockwise until both are
tight and magnet gap is fully closed. Rotate release gears (34)
counterclockwise from vertical centerline and center of brake
10 roots (valleys) of teeth. Drive gear (31) is to engage this
tenth root the following number of teeth from top right and
lower left edge of drive gear (31): 1 disc = 5, 2 disc = 6,
3 disc = 7, 4 disc = 8, and 5 disc = 9. Then continue per
paragraph 23. Do not tamper with thermal release mechanism
or control rod setting.
MAGNET COIL REPLACEMENT
(See Figures 2, 3 & 6 and Table 3)
24. Remove magnet assembly (3) (See Paragraphs 15 to 16).
25. Remove shading coils (51) (Single phase brakes only).
26. Coils (26) are held in place by epoxy cement or by bent over
end laminations. Force coil off magnet if held by epoxy. Remove
excess epoxy from magnet surfaces or bend up laminations and
remove coils.
27. Replacement coils are held in place by bending of end lami-
nations (See Figure 6). Insulating washers (27) are used above and
below on replacements. Remember this when ordering replacement
coils.
28. Replace coils. Sequence of black and yellow leads must be
maintained (See Figure 3). Important: Shading coils must be
replaced and held securely by staking in center of shading coil slot
or by cementing with epoxy. Bend down end laminations to
securely hold coils.
29. Reassemble brake (See Paragraphs 19 to 22).
Figure 6. Fastening of Replacement Magnet Coils
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