Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual - Manual (Page 116)

116 Rockwell Automation Publication 750-RM001F-EN-P - February 2012
Chapter 9 Safe Maximum Speed and Direction Monitoring
Safe Maximum Acceleration
(SMA) Monitoring Configure Safe Maximum Acceleration monitoring by setting the P64 [Max
Accel Enable] parameter to Enable. When configured, Safe Maximum
Acceleration Monitoring is active any time the safety option configuration is
valid and Safety mode is not set to Disabled.
The resolution accuracy of the acceleration monitoring in
revolutions/second
2
is equal to the speed resolution in:
The resolution accuracy of the acceleration monitoring in
mm/second
2
is equal to the speed resolution in:
When you configure the safety option for Safe Maximum Acceleration, the safety
option monitors the acceleration rate and compares it to a configured Safe
Maximum Acceleration Limit, P65 [Safe Accel Limit]. If the acceleration is
greater than or equal to the configured P65 [Safe Accel Limit], an Acceleration
fault (Stop Category fault) occurs.
Figure 41 - Acceleration Timing Diagram
IMPORTANT Acceleration is measured within the Overspeed Response Time, P24 [OvrSpd
Response] parameter.
(RPM x 2) ÷ 60
[(OverSpd Response - 36)/1000] seconds
(mm/s x 2)
[(OverSpd Response - 36)/1000] seconds
Acceleration Limit
P62 [Safe Max Speed]
Acceleration
Time