DYNAMICS GROUP 6-85175-32 Instructions Manual - Page 2

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MANUAL RELEASE

(See Figure 3)

To operate release, rotate two rods(10) clockwise until stop screw

(14) hits pin. (Enclosed Models only; Release cap (29) must be

removed by unscrewing, before rods can be rotated.) Brake will

remain in released position until rods are manually returned to origi-

nal position, or until electrical power is restored which automatically

returns the release rods to the set position.

WEAR ADJUSTMENT

(See Figures 3, 5 & 6, Tables 2 or 3)

Magnet gap "D" increases as friction discs wear. When gap approach-

es "D" max., adjust gap to "D" min. dimension by turning nuts (21

and 22). Magnet gap can vary from nominal + .005" between cor-

ners. After setting gap, readjust torque spring length "H".

CAUTION: MAGNET GAP MUST NOT EXCEED

"D" MAXIMUM.

FRICTION DISC REPLACEMENT

(See Figures 3, 5 & 6, Tables 2 or 3)

*When the rotating friction disc (4) wears down to a thickness of

7/32", replace disc.

1. Remove cover screws (24) and cover (23), plus gasket (28) and

gasket (32) on severe duty and enclosed models.

2. Unhook loop of torsion springs (11) from pins at rear of magnet

plate (16). Remove release stop screws (14), washers (12) and

shims (13).

3. Remove adjusting lock nuts (22), magnet assembly (16), adjusting

nuts (21), torque nuts (9), washers (8), torque spring (7) and

pressure plate (6).

4. Remove friction disc (4) and stationary disc (5). Replace worn

friction discs.

5. Reassemble all parts in reverse order. Set spring length "H"

and magnet gap "D". Assemble manual release. See following

paragraph.

MANUAL RELEASE ASSEMBLY

(See Figure 3)

When assembling a standard manual release mechanism (Figure 3),

add only enough shim washers (13) to obtain proper release action.

Too many shim washers will prevent automatic reset when electrical

power is applied. Too few washers will prevent the motor shaft from

TORQUE ADJUSTMENT

(See Figures 3, 5 & 6)

Brake is factory set for rated torque per spring length "H". To

increase stopping time and lower torque, turn four locknuts (9)

counterclockwise, increasing dimension "H". All four springs must be

set to the same length. Do not decrease spring length "H" as this

may cause coil to burn out.

Figure 3. Exploded View of Brake

turning freely. Replace stop screws (14). Wind each torsion spring

(11) approximately 1/4 turn and hook spring loop over pin.

MAGNET COIL REPLACEMENT

(See Figures 3 & 4)

Remove magnet assembly as outlined under FRICTION DISC

REPLACEMENT.

Coils (18) are held in place with epoxy cement. Force coil off

magnet mounting plate and remove excess epoxy from all surfaces.

Replacement coils should be held in place with new epoxy cement.

The epoxy cement should be heat resistant and shock resistant.

Place an insulating washer (19 or 19a) below the coils. Order

insulating washers when ordering coils. An insulating washer can be

cut to suit when replacing only one coil on a multiple coil assembly.

When installing coils, it is very important to follow EXACTLY the

sequence of black and light colored leads as shown in wiring diagram

(Figure 2). The brake will not operate properly unless coils are all in

the correct position.

Figure 4. Fastening of Replacement Magnet Coils