MGM BAH 132 Series, Руководство по эксплуатации и обслуживанию

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Page 34 of 63
Doc. Ref.: A79H0319
Brake cover removing
Unscrew the BAH brake adjuster plug (119). Unscrew the brake cover locknut (125). Remove the brake cover (26). To reassemble
the brake cover (26) proceed backwards. For the BAHE-BAHXE series motors or motors with unlocking type brake hand release , as
first step, it is necessary to proceed taking off the relative components, following the instructions described in the relative
paragraphs ‘Unlocking brake hand release removal’
and ‘Encoder disassembly and/or its replacement’.
Brake torque adjustment
The brake torque is proportional to the springs (18) compression, which can be varied by operating on the locknuts (20). The
compression of the springs must be as uniform as possible. On the table 2 and 3 the standard compression values (H std) of the
brake springs are shown. 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. After every intervention pls verify that the
braking torque is the one 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 40% of the maximum
value. For any clarifications, please contact the M.G.M. motori elettrici S.p.A. organization.
Three phase AC brake coil
Frame height 132
3
160
1
180
1
200
1
225 250 280
H std (mm) 17.0 20.5 35.5 35.5 32.5 36.0 35.0
Table 2
DC brake coil
Frame height 132
3
160
2
180
2
200
2
225
4
250 280
H std (mm) 17.0 19 32 32 32.5 - -
Table 3
1) The brake assembly of motor series BAH 160÷280 with AC brake is equipped with 6 springs
2)
The brake assembly of motor series BAH 160÷200 with DC brake is equipped with 3 springs. The 3 springs must be put on 3
brake adjusters situated at 120° to assure an uniform braking action. The other 3 brake adjusters are without springs.
3)
The brake assembly of motor series BA, BAPV, BAF 132 with AC brake coil is equipped with springs bright silver coloured. The
brake assembly of motor series BA, BAPV 132 with DC brake coil is equipped with springs black coloured.
4) The brake assembly of motors BAH 225 with DC brake have 6 springs.
Brake disc replacement
Please verify that the type of brake disc is suitable for the application and in particular for motors size 132 verify if a K
brake disc is needed (e.g. liftings, safety applications, cranes and so on). For further details pls contact MGM motori
elettrici SpA.
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).
Remove the brake cover (26) as described in the relevant paragraph. Take off the brake coil (25) from the brake adjusters (19),
remove the nuts (20) 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.