inspections at least twice a year. For specific information pls contact the M.G.M. motori elettrici S.p.A.
organization.
- Periodically check that the motor operates correctly without noise or strange vibrations and that the openings for
ventilation are not obstructed.
- Verify that all motor and brake supply terminals are property tightened to the terminal board as well as the earthing
terminal to the motor frame.
- As a result of normal wear of the brake disc lining, check that the air gap does not exceed the values shown on
table 1.
Please note that the brake linings wear is greater during the run-in. ( few thousands stops). For the air gap
adjustment, follow the instructions given into the paragraph "Air Gap Adjustment".
- Check the wear on both friction surfaces of the brake disc (on one side only for BAPV series) to be sure that
their thickness is not less than 2 mm. Verify also that there are no damages on disc surfaces and, in particular, in the
hub toothing. (For replacement, refer to the paragraph "Brake Disc Replacement"). For those brake disc with rivets on
disc lining verify that braking surface has not reached the rivets; moreover check that no play should be between the
brake disc and the brake disc hub in correspondence of the hub nails.
- Verify periodically that the braking torque is suitable. If needed, proceed to its adjustment as stated in the paragraph
"Braking torque adjustment".
- Verify regularly the brake adjuster (19-42) wear conditions and their steady fastening on the rear cover brake surface
(17).
- All brake assembly components, in particular the brake disc (23, 39-41 for BAF series, 45 for BAPV) and the
brake adjusters (19, 42 for BAF-BAPV series) are subject to wear. In consideration of safety it's needed to
replace them periodically. The replacement frequency comes from the motor duty (number of start/stop,
applied moment of inertia, environment conditions and so on), we recommend however to replace them at
least every 18 months.
- Periodically check and verify 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).
The brake torque is proportional to the spring (18) compression. The compression of the springs must be as uniform as
possible. On the table 2 and 3 are shown the standard compression values (H std) of the brake springs. The
corresponding brake torque of the standard compression values stated on the table are less than the maximum braking
torque stated on the motor nameplate, especially for AC brake assembly. Please verify that the braking torque is
suitable for your application.
If the brake coil (25) isn't able to call the brake moving element (24) back with a quick stroke and keep it attracted without
vibrations, verify the exact air gap adjustment and, if this inconvenience still persists, loosen the locknut (20) and try it
again until desired functioning is obtained.
Some types of motors ( BA series 160÷225) can have 3 or 6 springs(18). Pay attention to the different adjustment of the
spring compression to reach the brake torque value required.
After every intervention pls verify that the braking torque is that required.
Never exceed the maximum braking torque value stated on the motor name plate. It's recommended to avoid adjusting
the braking torque to values lower than 30% of the maximum value.
Please verify that the type of brake disc is suitable for the application and in particular verify if it's need to be used a K
brake disc (e.g. liftings, safety applications, cranes and so on). For further details pls contact MGM motori elettrici SpA.
Loosen the rear nut (27), remove the end cover (26) and unscrew the locknuts (22). Take off the brake coil (25) from the
brake adjusters (19), remove the nuts (20-21) and the springs (18). Remove the brake moving element (24) sliding it
through the brake adjusters (19). Take off the old brake disc (23) and put in the new one.Verify that the new brake disc
has been placed in the correct side. For re-assembling, proceed backwards. We recommend that the new brake disc
must be handled with clean hands, because even a small trace of grease will decrease the braking performance and
also increase noise. In the BAF series otherwise than in the BA series there are 2 brake discs (39-41) with an
intermediate brake moving element (40) in between. After the brake coil (25) replacement, proceed to the airgap
The airgap must be as indicated on the table. Don’t exceed this range to avoid any damage on the brake
assembly.
Braking Torque Adjustment
Brake Disc Replacement
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