Text version of the page 
Text version of the page 
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BA series brake group | | | | | | | | | | 1 | | | | | | Air gap adjustment | | | | | | | | | | | | | | The air gap |6c|, that is the distance between the two magnetic cores, the brake coil ¡§8 and brake moving element 124!, must stay within the value expressed in the chart below. It is not advisable to exceed the expressed value, in order to avoid vibrations of the brake moving element, very loud noise, the brake coil burning or even the whole brake assembly failure. It is advisable to check periodically the air gap because it increases as a consequence of the brake disc wear. In order to set the air gap to the indicated value, you have to loosen the nuts 121I pffl so to move the brake coil p§8 towards the brake moving element 124I Once this operation has been settled be sure to tighten the locknuts. | | | | | | —(22 —(26 | | | | | | | | | | | | | | Ш! Size ip | | 71-80 | | 90-100 | | 112-132 160-200 | | 225 | | | | | | | | | | 0.25-0.5 | | 0.3-0.6 | | 0.4-0.8 | | 0.5-1.0 | | 0.6-1.2 | | | | | | | | | | | | | | 1 | | | | | | | | | ¿3] | | | | | Bl | | | | | Brake torque adjustment | | | | | | | | | | | | | | | | | The brake torque is proportional to the industrial springspBcornpression, which can be adjusted tightening or loosening the locknutslm The compression of the three springs must be as even as possible. Once the brake is properly supplied, if the brake coil isn't able to attract the brake moving element with a quick stroke and to keep it attracted without any vibrations, check the air gap adjustment and, if this inconvenience industrial still persists, loosen the locknut [201 by two threads and try again until the proper functioning is obtained. It is important to consider that some motors can be equipped with 3 springs and some others with 6. (see page 23). Once this operation is completed, check the brake torque to make sure it is set to the desired value. Never set the brake torque to a higher value than the one indicated on the motor nameplate. Permissible start frequency under load _ | | | | | | ¿4 (60 | | | | | | | | | | | | | | r- | | | | | | R 1 0,8 0,6 0,4 0,2 0 | | | | | | | | | | The technical data tables provide the ideal no-load start frequency (Zo). The permissible start frequency when an external load is applied (Z load) can be found with the following formula: Zload=Zo • K • R where "Zo" is the table-value for the selected motor and "K" and "R" are factors determined by the curves on the side; the factor "K" is related to the ratio of the moment of inertia of the applied load (Japp) to that of the motor (Jmot) while the factor "R" is related to the ratio of the resisting torque (Tr) to the starting torque (Ts). This calculation gives an approximative indication only. If the required starting frequency is close to Zload, it is advisable to use a motor equipped with thermal protectors. It is necessary to check the maximum energy dissipation limit of the brake group and the maximum motor RPM in those applications where high moment of inertia is involved. On request is available a special brake disc material capable to withstand very high dissipation energy. Please contact MGM technical staff for additional information. | | | | | | | | | | 0 0,2 0,4 0,6 0,8 1,0 Tr / Ts | | | | | | | | | | K 1,2 1 0,8 0,6 -| 0,4 0,2 0 | | | | | | | | | | 01 2345678 J a p p /Jmot | | | | | | | | | | | | | | Brake coil wiring diagram | | | | | | | | | | | | | | | | | + | White | | | | White | | | | Red | | | | Grey or Brown | | | | | Black 1 | | | | | | | | | | | | | As standard BA series motors are equipped with AC industrial brakes with single terminal board for the brake and the motor while on request it is possible to supply the brake separately. On request DC brakes are available for BA series with the rectifier located inside the terminal box. The rectifier is provided with over-voltage protection devices and with a Rfi filter. MGM brake motors equipped with DC brakes can be connected as in diagram A or B according to the needed braking time. MGM motors provided with DC brake coil are connected as in diagram A. The DC brake coil has to be connected according to diagram B to have a reduced brake reaction time. | | | | | | | | | Brake coil | | | | | | Diagram A | | | | | | | | | | | | | | White | | | | | | | | | | White | | | | | | | | | | | | | | Red | | | | | | | | | | Grey or Brown | | | | | | | | | | J | | | | | | Black | | | | | | | | | | | | | | Brake coil | | | | | | Diagram B | | | | | | | | | | | | | | 22 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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