Mitsubishi MELDAS MDS-C1

2. Wiring and Connection
2 - 39
2-8 Wiring of the motor brake
The magnetic brake of servomotors with a magnetic brake is driven by the motor brake control
connector (CN20) on the servo drive unit. The servo drive unit releases the brake when the motor is ON.
(Servo ON means when torque is generated in the motor.)
2-8-1 Motor brake release sequence
The motor brake control connector (CN20: MBR) releases the magnetic brake in the sequences in the
following drawing when canceling the emergency stop. The brake is released after the start of the power
ON to the servomotor.
ON
Cancel
Emergency stop (EMG)
ON
OFF
Servo read
y
si
g
nal
(
RDY
)
ON
OFF
Servo ready completion
signal (SA)
0
500 1000 1500
Time (ms)
Command input enable
Cancel
ON
Magnetic brake
Dynamic brake
Cancel
ON
Ready completion
Motor brake control sequences when an emergency stop is canceled
2-8-2 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 ON
SERVO OFF
Servo OFF command
OFF
ON
Motor brake control output
CN20 connector (MBR)
Dynamic brake
OFF
ON
Motor ON (GATE)
ON
OFF
Motor brake control sequences when a servo OFF command is output
200ms
CAUTION
The vertical axis drop prevention control only is performed during an emergency
stop (including alarms and power failures). It is not performed 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 "4-5 Setting for emergency stop" for details on the operation
sequences for each stop method.