1. Occasions with brake servo motors:
The servo motor is mainly loaded by the motor shaft, assuming that the load driven by the motor shaft is in the vertical direction, after the entire control system is powered off, the load on the servo motor shaft will drive the motor to run downward under the action of gravity, so that there will be damage to the mechanism or the formation of safety accidents. Therefore, when the servo motor is used to drive the load in the vertical direction, in order to prevent the servo motor shaft from moving after the power failure, the servo motor with braking function is selected, so that after the servo motor is powered off, the motor can actively brake without moving.
Regarding loads such as the horizontal direction, even if the motor shaft is in an idle situation after the system is powered off, the load in the horizontal direction will not generate external force at the end of the motor shaft, and the shaft will not move under normal circumstances, so the load in this direction does not have to choose a servo with brake type.
In the use of the servo with brake type must pay attention to the brake function is used in the case of abnormal power failure, in the whole normal operation project, can no longer use its brake function, even in the normal operation process, the servo is in a suspended situation, at this time only to ensure that the servo ON (SON) signal on the servo drive insists on on, through the SON signal to confirm the servo axis.
Assuming that in the normal power-on process, the brake function of the servo motor is used to hold the brake, so that the frequent initiation will damage the motor and shorten the service life of the motor.
2. Types of brake servo motors:
Mitsubishi servo motors with brake function, with B in the motor type, indicate that they have brake function. In the following two figures, it is composed of the servo motor types corresponding to the MR-JE and MR-J4 commonly used by Mitsubishi. (The driver also has a B, where B indicates that it is a servo that supports the Mitsubishi SSCNET network)
Precautions for the use of Mitsubishi servo motor with brake
Precautions for the use of Mitsubishi servo motor with brake
3. Option with brake servo motor
In addition to the difference in the type of motor body, it is also necessary to purchase a brake cable (or brake joint attachment) when selecting a servo motor with brake.
Mitsubishi's current commonly used MR-JE and MR-J4 series correspond to the motors, and the corresponding low-power servos supply standard brake cables, while the high-power servos supply brake joints.
Precautions for the use of Mitsubishi servo motor with brake
4. Brake servo motor related control wiring
The brake connector of the brake servo motor is a 2-core interface, and when the brake is turned on, only the DC24V power supply needs to be connected to these two terminals. However, in the practice of wiring, it is necessary to consider that the servo confirmation signal (SON) is disconnected in the servo alarm or other situations, and the 24V power supply can be disconnected and the servo shaft can be braked when the servo shaft cannot be confirmed.
Precautions for the use of Mitsubishi servo motor with brake
Precautions for the use of Mitsubishi servo motor with brake
According to the above two figures, when the servo appears OFF signal or generates an alarm, the servo shaft can not be electrically confirmed, when the electromagnetic brake interlocking signal MBR output, the intermediate relay coil is controlled through the MBR signal output, and then the normally open point of this coil is used to control the DC24V circuit.
The external 24V power supply required for braking needs is to use an independent dedicated power supply, not to mix with other 24V power supplies.
Attention should be paid to the following when wiring:
The MBR signal is not defined by default in the servo, assuming that the user needs to use this signal, the demand is set by the servo parameters (PD23-PD26, PD28), and other pins that are not used are defined as MBR signals.
For example, for MR-JE-A or MR-J4-A drivers: set PD23 to data 05, which can be used to define pin 45 in the CN1 connector to define MRB signals (parameter default value is 04, function is INP signal)
Precautions for the use of Mitsubishi servo motor with brake
The MBR signal output drives the intermediate relay, which can be referred to the wiring method in the figure below.
Precautions for the use of Mitsubishi servo motor with brake
5. PC16 parameter description
PC16: Set the delay time from the time when the MBR (electromagnetic brake interlocking) signal is closed to the stop when the base circuit is broken. Set the scale (0-1000ms).
When the servo motor with brake is operating normally, the brake joint is connected to the 24V power supply and turns over the brake, and the servo shaft is confirmed by the SON signal. When the SON signal is closed, the servo confirmation will be removed after TB(ms) and the parking situation will be opened, assuming that the electromagnetic braking is useful in the case of servo confirmation, the braking life of the motor will be shortened.
Therefore, when used in the vertical direction, Tb is set to about 1.5 times the *** small delay time when the movable part does not fall.
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