MGM BA Serie Empleo Y Mantenimiento página 9

handled with clean hands, because even a small trace of grease will decrease the braking performance and also
increase noise. In the BAF series , unlike the BA series there are 2 brake discs (39-41) with an intermediate brake
moving element (40) in between. After having mounted the brake coil (25), proceed to the airgap adjustment (see the
pertinent paragraph). For the flywheel (45) replacement on the BAPV series, follow up the specific instructions.
Before replacing the brake disc it's always necessary to check the shaft splines wear, exactly where the disc
slides. If the shaft splines has a visible wear it's necessary to replace the rotor shaft (1).
Brake Coil Replacement
Loosen the rear nut (27), remove the end cover (26), disconnect the brake coil (25) connectors. Unscrew the locknuts
(22) and pull off the brake coil (25) from brake adjusters (19 o 42). Reassemble the new brake coil on the brake adjusters
(19 o 42) and reconnect the electrical connectors. Pay attention to place the electrical connectors in the right position so
that to allow their insertion. Before reassembling the end cover (26) and the nuts verify that the connections and relative
cables are property tightened. Proceed with the air gap adjustement as stated in the respective paragraph. Verify that
the brake coil functions correctly; when the brake is energized, the brake coil (25) should attract the brake moving
element (24) with a quick stroke, and hold it without any vibration or noise. In case of any vibration, check that terminal
connectors are coupled correctly and tightened.
Brake adjusters replacement
Loosen the rear nut (27), remove the end cover (26 or 48) and unscrew the locknuts (22). Take off the brake coil (25) from
the brake adjusters (19 or 42), remove the nuts (20-21) and the springs (18). Remove the brake moving element (24)
sliding it through the brake adjusters (19), remove the old brake adjusters and screw the new ones verifying their steady
fastening on the rear cover brake surface (17). After having screwed each brake adjuster (19 or 42) it's necessary to
check that its support bottom is completely leaned on the rear cover brake surface (17). For information on the right
brake adjusters tigthening torque please contact us.
Air Gap Adjustment
The air gap (60) i.e. the distance between the two magnetic cores of the brake coil (25) and the brake moving element
(24), must be as shown on table 1. It's strongly unadvisable to exceed these values in order to avoid vibrations of the
brake moving element, prominent noise, the burning of the brake coil or the brake assembly damaging.
It's advisable to check periodically the air gap. Because of the wear of the brake disc linings air gap, tends to increase.
Please note that brake linings wear is greater during the run-in ( few thousands stops).
In order to set the airgap back to the required value, operate on the nuts (21-22) in order to move the brake coil (25)
towards the brake moving element (24). It's strongly recommended to avoid to tighten the locknut (22) located on one
brake adjuster (19, 42 for BAPV-BAF series motors) before having completed the positioning of the brake coil (25) on all
the brake adjusters. Therefore don't regulate the position of the brake coil adjusting the nut (21) on one brake adjuster, if
previously you haven't loosen the locknuts (22) on all the brake adjusters (19, 42 for BAPV-BAF series motors). This
wrong operation could stress the air gap adjusters. Please verify that the airgap is uniform. The air gap must be uniform
to guarantee a correct functioning and avoid mechanical stresses due to a misalignment. When the air gap adjustment
has been settled, the locknuts (22) should be tightened. For brake assembly with 6 brake adjusters (19, 42 for BAPV-
BAF series motors), as first step regulate the brake coil position only on three brake adjusters at 120° by working onthe
nuts 21-22. After having adjusted the position on these 3 brake adjusters, to complete the operation go on with the other
3 brake adjusters and first bring the air gap adjusting nuts (21) close to the brake coil and then tighten the locknuts (22).
When the operation has been settled, verify that the airgap is uniform and the nuts (21-22) are tightened.
Recovery/disposal
Disposal of the motor must be carried out in compliance with current applicable regulations in the country of installation.
The crossed-out waste bin symbol, contained on the infomation plate, indicates that, at the end of its useful life, the
product must not be disposed of as urban waste but must be collected seperately from other waste and sent for recovery
or possible disposal according to specific methods for avoiding possible negative effects on the environment and to
health, and for favouring its re-use and/or recycling of the materials of which it is made up.