Rockwell Automation Publication 2198-UM005C-EN-P - February 2022 57
Chapter 4 Connector Data and Feature Descriptions
Two connections (MBRK+ and MBRK-) are required for the motor brake
output. Connections are rated for 2.25 A @ +24V (refer to Figure 29).
Figure 29 - Motor Brake Circuit
Control of the solid-state relay to release the motor brake is configurable in the
Logix Designer application (refer to Configure SPM Motor Closed-loop
Control Axis Properties beginning on page 122). An active signal releases the
motor brake. Turn-on and turn-off delays are specified by the
MechanicalBrakeEngageDelay and MechanicalBrakeReleaseDelay settings.
Follow these steps to control a holding brake using a Motion Servo Off (MSF)
command.
1. Wire the mechanical brake according to the appropriate interconnect
diagram in Appendix
A beginning on page 169.
2. Enter the MechanicalBrakeEngageDelay and Mechanical
BrakeReleaseDelay times in the Logix Designer application.
Refer to Axis Properties>Parameter List. The delay times must be from
the appropriate motor family brake specifications table in the Kinetix
Rotary Motion Specifications Technical Data, publication KNX-TD001
.
3. Use the drive stop-action default setting (Current Decel & Disable).
Refer to Axis Properties>Actions>Stop Action in the Logix Designer
application.
4. Use the motion instruction Motion Axis Stop (MAS) to decelerate the
servo motor to 0 rpm.
5. Use the motion instruction Motion Servo Off (MSF) to engage the brake
and disable drive.
For more information on how the servo motor holding-brake option can be
used to help keep a load from falling see Vertical Load and Holding Brake
Management Application Technique, publication MOTION-AT003
.
ISP772
MBRK+ (BC-1)
MBRK– (BC-2)
24V+ PWR
24V–
INT PWR
Kinetix 5300
Servo Drive
Control
Board
Inductive
Energy
Clamp
IMPORTANT Motor holding-brake switching frequency must not exceed
15 cycles/min.
IMPORTANT Holding brakes that are available on Allen-Bradley® rotary motors are
designed to hold a motor shaft at 0 rpm for up to the rated brake-holding
torque, not to stop the rotation of the motor shaft, or be used as a safety
device.
You must command the servo drive to 0 rpm and engage the brake only
after verifying that the motor shaft is at 0 rpm.
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