1. Occasions to choose a servo motor with brakes:
If the load driven by the motor shaft is in a straight direction, after the power off of the entire control system, the load on the servo motor shaft will be driven to run downward under the effect of gravity, which will damage the organization or cause a safety accident. Therefore, when the servo motor is used to drive the load in the straight direction, in order to prevent the servo motor shaft from moving after the power is off, the servo motor with brake function is selected, so that after the servo motor is powered off, the motor can automatically brake without moving.
Regarding loads such as the horizontal direction, even if the motor shaft is in a comfortable state 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 need to pick 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 state, at this time as long as the servo ON (SON) signal on the servo drive is kept on, the servo axis can be determined by the SON signal.
If the brake function of the servo motor is used to hold the brake during the normal power-on process, the frequent start 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 the servo that supports the Mitsubishi SSCNET network)
3. Option with brake servo motor
When selecting servo motors with brakes, in addition to the difference in the type of motor body, it is also necessary to purchase other brake cables (or brake joint accessories).
The motors corresponding to the MR-JE and MR-J4 series commonly used by Mitsubishi now provide standard brake cables for low-power servos, while the high-power servos provide 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 determination 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 determined.
According to the above two figures, when the servo presents an OFF signal or generates an alarm, the servo shaft can not be determined by electricity, and when the electromagnetic brake interlocking signal MBR output, the control center relay coil is output through the MBR signal, and then the normally open point of the coil is used to control the DC24V circuit.
The external 24V power supply required for braking is required to use an independent dedicated power supply, not to mix with other 24V power supplies.
Attention should be paid to the following when wiring:
If the user needs to use this signal, he needs to use the other unused pins as MBR signals through the servo parameter settings (PD23-PD26, PD28).
For example, for MR-JE-A or MR-J4-A drivers: set PD23 to data 05, which can be used to demarcate pin 45 in the CN1 connector as MRB signal (parameter default value is 04, function is INP signal)
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 turned on the 24V power supply and turns over the brake, and the servo shaft is determined by the SON signal. When the SON signal is closed, the servo determination will be released after TB(ms) and the free parking state will be entered, and if the electromagnetic braking is effective in the servo determination state, the braking life of the motor will be shortened.
Therefore, when used in a straight direction, Tb is set to about 1.5 times the *** small delay time when the movable part does not fall.
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