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MDS-D2/DH2 Series Instruction Manual
2.7 Wiring of the Motor Brake
(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.
< Caution in use of MDS-D2/DH2-V2/V3 >
It is required to input a servo OFF command to all axes in order to turn the brake ON with a motor brake control
output (CN20) of drive unit. Input the servo OFF command to an axis cannot turn the brake ON. Therefore, when
performing a control to fix the position with the motor brake by the servo OFF command during the motor stop for
PLC axis, use 1-axis drive unit.
During emergency stop, the servo OFF is applied to all axes at same time, so a brake control is not affected.
(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 "Setting for emergency stop" for details on the operation sequences for
each stop method.
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 all axes in the same unit in order to perform a motor brake control output (MBR) at
2-axis or 3-axis drive unit.
Servo OFF command
Dynamic brake
Motor brake control output (CN20)
Motor ON (GATE)
Motor brake control sequences when a servo OFF command is output
SERVO ON
SERVO OFF
OFF
ON
ON
OFF
OFF
ON
200ms
MDS-D2/DH2-V2/V3
Servo ON
command
NC axis
Axis drop
The brake does
not work.
Danger !
Servo OFF command
Motor brake control
PLC axis