Motor Brake Release Sequence; Control During The Servo Off Command; Operation Sequences When An Emergency Stop Occurs - Mitsubishi Electric MELDAS MDS-R Series Technical Specification And Instruction Manual

7-8-2 Motor brake release sequence

The motor brake control output (CN9 connector: MBR) releases the motor brakes with the sequence
shown below 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.
Emergency stop (EMG)
Dynamic brake
Motor ON (GATE)
Motor brake control output (MBR)
READY ON signal (READY)
Servo ON signal (SERVO)
Motor brake control output operation sequence when an emergency stop is canceled

7-8-3 Control during the servo OFF command

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.
Servo OFF command
Dynamic brake
Motor ON (GATE)
Motor brake control output (MBR)
Motor brake control output operation sequence when a servo OFF command is input
CAUTION

7-8-4 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 "9-4 Setting for emergency stop" for details on the operation
sequences for each stop method.
7. Wiring and Connection
OFF
ON
OFF
ON
ON
OFF
OFF
ON
ON
OFF
ON
OFF
0
SERVO ON
SERVO OFF
OFF
ON
ON
OFF
OFF
ON
The vertical axis drop prevention control is performed only during an
emergency stop (including alarms and power failures). It is not performed
when a servo OFF command is input.
500 1000
7 - 19
Servo holding power occurs
Ready completion
Command input enable
1500
Time (ms)
200ms