AutomationDirect SureServo2 Handmatig - Pagina 17
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2.9 - The Use of Braking
A brake is usually used for motions in Z-axis direction because gravity causes the mechanism
to fall. A brake can prevent the mechanism from falling and greatly reduce the motor's
resistance output. The motor lifespan could be reduced due to resistance and excessive heat
generation. To avoid incorrect operation, the brake should be enabled only when the servo
is disabled. The brake is engaged (holding the motor) when no power is applied to the brake
wires. The brake is disengaged (allowing the motor to spin) when power is applied to the brake
wires.
The servo drive can control the brake with a digital output (DO). If DO.BRKR (Brake Relay -
always use a relay to provide the higher current required by the brake) is set to off, it means
the brake is engaged and the motor is clamped. If DO.BRKR is set to on, it means the brake is
not engaged and the motor can run freely. You can use MBT1 (P1.042) and MBT2 (P1.043) to set
the delay time. The timing diagrams below assume the DO definition code = 0x108. The output
definition of 0x108 in P2.018 - P2.022 means that the DO is set for the Magnetic Brake and
that the output functions as "Normally Open" (current is flowing when ON, and current is not
flowing when OFF).
Timing diagram of brake control:
Brake Disable Delay Time or Zero Speed (whichever occurs first) will cause the brake to clamp.
SON
(DI)
BRKR
(DO)
Motor
speed
Output timing of the BRKR signal:
• When the servo drive is off and the time set for P1�043 is exceeded, but the motor speed is
still higher than the speed set for P1�038, DO�BRKR ends off (the motor is clamped)�
• When the servo drive is off and the time set for P1�043 is not yet reached, but the motor
speed is already lower than the speed set for P1�038, DO�BRKR is off (the motor is clamped)�
Wiring of the Brake:
SureServo2 User Manual – 1st Edition – 05/20/2021
OFF
OFF
MBT1 (P1.042)
ON
ON
MBT2 (P1.043)
Chapter 2: Installation
OFF
OFF
ZSPD (P1.038)
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