ACCO Brands LOUDEN 200 Series, Installation, Operation, Maintenance And Parts Manual

Page: 137 / 144

Torque Adjustment
Caution: Load to be removed or blocked. Brake may be
inoperative during this procedure.
The magnetic disc brake is factory set for rated static torque.
The brake can be adjusted to reduce torque which increases
stopping time. Do not attempt to adjust brake for higher
torque, as this will cause premature coil burnout. (Refer to
Fig. 3)
1. To adjust, remove cover locknuts (22) and cover (20)
to expose torque locknuts (15T), which are above
torque springs (15S).
2. To increase stopping time and reduce torque, turn
two locknuts (15T) counterclockwise, increasing
spring length. Each full turn reduces torque 7% to
10% depending upon the model.
Friction Disc Replacement
Caution: Load to be removed or blocked. Brake will be
inoperative during this procedure.
If brake model number has a prefix VO or VU, see page 8.
When total wear on a rotating friction disc (13) reaches
1/16”, replace disc:
1. Removing operator assembly
Disconnect power.
2. Remove cover locknuts (22) and cover (20).
3. Remove operator assembly (15) by removing screws
(16), pivot stud (10), washer (18), bushing (17), and
spring (11).
NOTE: Item (10) has a hex socket in end of stud for
removal. Do not loosen nuts (19) on pivot stud (10),
or “Pivot Stud Adjustment” (on page 6) to quiet the
magnet will have to be made.
4. Replacing the friction disc
Remove worn rotating discs (13) and stationary discs
(12). Replace worn discs and install new discs in the
same order. Install stabilizer clip (14), if furnished, on
rotating discs prior to installing.
5. Re-assembly of operator assembly (15)
Refer to Figs. 3 and 9. (Capscrew (16) is shown in
Fig. 9 and not Fig. 3)
Turn two screws (15H) counterclockwise five turns.
Place operator assembly onto brake bracket (2) and
install two screws (16). Replace compression spring
(11), bushing (17), washer (18), and pivot stud (10)
which has the two nuts (19) in place. Tighten firmly.
6. Readjust magnet air gap “A” as described under
“Wear Adjustment” on page 4.
7. Check manual release operation before completing
installation. Adjust per “Manual Release Adjustment”
on page 7 if required.
8. Completing installation
Replace cover (20) and cover locknuts (22). Tighten
just enough to hold the cover in place. Reconnect
power.
Magnet Assembly Replacement
Caution: Load to be removed or blocked. Brake will be
inoperative during this procedure.
1. Disconnect power supply.
2. Remove cover locknuts (22) and cover (20).
3. Remove two capscrews (15D), magnet assembly
(15A) and shock mount (15B).
4. Replace with new magnet assembly (15A), making
sure shock mount (15B) is in place. Feed coil lead
wires through hole in back of bracket (15C) as shown
in Fig. 4. TIghten mounting screws (15D) with 55-60
lb. in. torque.
5. Place coil lead wires around mounting bracket (15C)
to the same side as the wire outlet position. Connect
coil lead wires per “Connection of Coil Leads” and
Fig. 2.
6. Set air gap “A” as described under “Wear
Adjustment” on page 4.
7. Energize coil. Magnet should be quiet; if not, refer to
“Pivot Stud Adjustment” on page 6.
8. Check manual release. If it does not operate properly,
adjust as outlined under “Manual Release
Adjustment” on page 7.
9. Replace cover (20) and cover locknuts (22). Tighten
just enough to hold the cover in place. Reconnect
power.
Figure 4
5