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2. Wiring and Connection
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2-6 Wiring of the motor brake
2-6-1 Wiring of the motor magnetic brake
The magnetic brake of servomotors with a magnetic brake is controlled 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.)
(1) Motor brake release sequence
The motor brake control output (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 ready signal (RDY)
ON
OFF
Servo ready completion
signal (SA)
0
500 1000 1500
Time (ms)
Command input enable
Cancel
ON
Motor brake control
output (MBR)
Dynamic brake
Cancel
ON
Ready completion
Motor brake control sequences when an emergency stop is canceled
(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
1. 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. A servo OFF command is required at both axes in order to perform a motor
brake control output (MBR) at 2-axis drive unit.