MGM BAH 132 Series, Use And Maintenance Manual

Page: 32 / 63

Page 32 of 63
Doc. Ref.: A79H0319
Maintenance
Inadequate inspections and maintenance can produce personal injury or property damage. Maintenance and
inspection operations described here below are absolutely essential in any case and they become even more
important in relation to heavy duty applications or situations in which the brake motor performs as key safety role
(e.g. Lifting, safety applications, cranes and so on).
Maintenance operations must be carried out only by qualified personnel only after having previously disconnected the
equipment or the motor from the main supply (including any auxiliary and in particular the anti-condensation
heaters).
Check that no load is applied to the drive shaft before conducting any regulation, maintenance or replacement
operations of components, due to possible ineffective braking.
In case of motors with thermal protectors special precautions should be taken so that an accidental automatic restart
cannot cause any danger
Don’t use repaired or altered components. Always use brand new OEM components as replacement parts. Installation
and maintenance personnel must immediately notify all the product defect or anomalies. The installation and
maintenance personnel must NOT allow any motor use until all possible problems are solved and it’s safe to operate
the motor.
After any operation on the brake assembly, verify that the brake cover (26) is firmly held in place by the brake cover
fixing nut (125).
The operations which must be carried out periodically in order to ensure the correct functioning of the MGM brake motor are
listed further on. The frequency of inspection depends on the particular motor duty (number of start/stop, applied moment of
inertia, environment conditions and so on). Generally it's advisable to proceed to the first inspection after few weeks of working
and to draw up a periodical maintenance plan. Anyway it's recommended to provide inspections at least twice a year. For specific
information please 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. In particular verify the bearings noise, if any. MGM standard bearings are lubricated
for life therefore no oil refill is normally required. If bearings needs to be replaced, always use the same type of those
originally used on the motor.

Verify that motor ventilation air inlets are not obstructed. When the motor operates in dusty environments, the
cleaning of the motor is important and it has to be done more frequently.

Verify that the full load motor current is congruent with the data stated on the name plate (I Amps).

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.

Check that the power supply wires and the earth cables are in good conditions.

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 to be sure that the thickness of both surfaces is not less
than 3 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"). 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).