Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 356)

356 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 6 Integrated Motion on the EtherNet/IP Network Applications for PowerFlex 755 AC Drives
To view help for the MDS instructions, right-click MDS in the function block
and choose Instruction Help, or select the instruction and press F1. Additionally,
see “Speed Limited Adjustable Torque (SLAT) Min Mode and SLAT Max
Mode” in the PowerFlex 700S AC Drives with Phase II Control, Reference
Manual, publication
PFLEX-RM003 .
Changing the Accel/Decel Times for the MDS Instruction
If you are using the MDS instruction, the drive accelerates and decelerates at the
planner Max Acceleration and Deceleration values. To set the
“RampAcceleration” and “RampDeceleration” you need to use SSV instructions
to change the ramp rates. Below is an example of the SSV instructions:
• Set the RampAcceleration / RampDeceleration attribute to “x” revs/sec
2
• Class Name = Axis
• Instance Name = “Axis Name”
• Attribute Name = RampAcceleration/RampDeceleration
• Source = Tag for value
Example: Velocity (Speed) command is 30 revs/sec and you want to reach that
speed from zero in 6.5 seconds. Ramp Acceleration needs to be set to 4.615 revs/
sec
2
.