Mitsubishi Electric MELDAS MDS-B-SVJ2 Series - Wiring of Motor Brake; Motor Brake Release Sequence; Control During Servo off Commands; Operation Sequences When an Emergency Stop Occurs

Chapter 2 Wiring and Connection
2-30
2-8 Wiring of motor brake
The magnetic brake of servomotors with magnetic brake is driven by the control signal (MBR) output
by the servo amplifier MDS-B-SVJ2. The servo amplifier releases the brake when the motor is ON.
(Servo ON means when torque is generated in the motor.)
Parameter setting is not required when using motor brake control output (MBR).
2-8-1 Motor brake release sequence
The motor brake control output (CN3 connector: MBR) releases the motor brake in the sequences in
the following drawing when canceling the emergency stop. Because the brake is released after the
start of the power ON to the servomotor, dropping due to an uncontrolled state does not occur.
Motor brake control output operation sequences when an emergency stop is canceled
2-8-2 Control during servo OFF commands
When a servo OFF command is input by an NC sequence input, the motor brake turns ON
simultaneously when the motor ON is shut off. Note that the vertical axis drop prevention control is not
validated, so a drop due to the brake operation lag occurs. When the servo OFF is canceled, a drop
due to an uncontrolled state does not occur.
Motor brake control output operation sequences when a servo OFF command is canceled
CAUTION
The vertical axis drop prevention control only operates during an emergency
stop (including alarms and power failures). It does not operate when a servo
OFF command is input.
2-8-3 Operation sequences when an emergency stop occurs
The motor brake control output operation when an emergency stop occurs differs according to the
motor deceleration stop method. Refer to section "5-4 Setting for emergency stop" for details on the
operation sequences for each stop method.
Servo holding power occurs
OFF
ON
ON
OFF
ON
OFF
0 500 1000 1500
Time
（msec）
Command input enable
OFF
ON
OFF
ON
ON
OFF
Ready completion
Emergency stop (EMG)
Dynamic brake
Motor ON (GATE)
Motor brake control output
(MBR)
Ready ON signal (READY)
Servo ON signal (SERVO)
SERVO ON
SERVO OFF
OFF
ON
OFF
ON
ON
OFF
200msec
Servo OFF command
Dynamic brake
Motor ON (GATE)
Motor brake control output
(MBR)