Rockwell Automation Publication 2198-UM004A-EN-P - October 2019 61
Connector Data and Feature Descriptions Chapter 3
Motor Brake Control Operation
Brake control is automatic. Figure 37 shows the timing of the brake control in two
different scenarios. Below is a description of the brake control operation shown in
Figure 37
:
• Brake Disengage (release)
When the Servo On condition is ON (digital input ‘Servo On’ activates or
Add-On Instruction command raC_Dvc_k5100MSO is issued), ID149
(P1.042) DisengageDelayTime begins timing. When this delay expires, the
brake output is set and motion can occur.
• Brake Engage
This operation involves parameters ID145 (P1.038) ZeroSpeedRange rpm
and ID150 (P1.043) EngageDelayTime.
Zero Speed Range is a programmable value. When the motor speed (rpm)
is below the Zero Speed Range value, the zero speed condition is met.
When the Servo On condition is OFF (digital input 'Servo On' is
removed, Add-On Instruction command raC_Dvc_k5100MSF is issued,
or the drive faults), ID150 (P1.043) Engage Delay Time begins timing.
The Zero Speed Range condition is actively evaluated. If the zero speed
condition occurs before the Engage Delay Time expires, the brake output
is OFF (scenario 2). If the zero speed condition is not met and the Engage
Delay Time expires, the brake output is OFF (scenario 1).
Figure 37 - Reduce ZoomBrake Control Timing Diagram
IMPORTANT If the Zero Speed Range and Brake Delay parameters are not set
correctly, the brake can set while the motor is in motion.
ON
ON
OFF
OFF
OFF
OFF
Servo On condition
Brake Output (DO)
ZSPD ID145 (P1.038)
Motor Speed (rpm)
Disengage Delay Time ID149 (P1.042)
Engage Delay Time ID150 (P1.043)
ZSPD ID145 (P1.038)
Motor Speed (rpm)
Engage Delay
Time ID150 (P1.043)
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