Rockwell Automation 8720MC Drives Integration Manual - Manual (Page 50)

Publication 8720MC-IN002A-EN-P — December 2002
2-18 Commissioning Your 8720MC Analog Drive
Start-up of Motor Orient This section provides the information you will need to orient your
motor. The motor orient procedure provides a means of positioning
the motor to a precise location regardless of whether the motor is
starting from standstill or rotating at high speed. The procedure that
follows assumes that the motor feedback device is an SNS-60 Sincoder
(8720SM-xxxxxxxS3, 8720SM-xxxxxxxS4 motors).
To understand the drive controlled motor orient feature refer to
Appendix C for the following:
Parameter 152, “Spin Orient Req”; Parameter 150, “Mtr Marker Ofset”;
Parameter 153, “Orient Angle”; Parameter154 “Orient Options”;
Parameter 157, “At Spd Window”; Parameter 222, “Spin Orient Spd”;
Parameter 260, “Pos Accel Rate”; Parameter 582, “Auto Home”,
Parameter 76, “Position Scaling” Parameter 79, “Rot Posn Resolut”
Parameter 103, “Modulo Value”
To orient your motor:
1. As an initial check, make sure that Parameter 582 “Auto Home” is
set for “Index” and Parameter 76, “Position Scaling”, has modulo
checked.
2. Verify that Parameter 79, “Rot Posn Resolut” = 3600 counts/
revolution. Increase the resolution if higher resolution than 3600
counts per revolution is desired. This can be increased to 32,767
counts.
3. Verify that the following parameters are set to the described
values:
• Parameter 150, “Mtr Marker Ofset” = 0 counts
• Parameter 153, “Orient Angle” = 0 counts
• Parameter 222, “Spin Orient Spd” = 100 rpm.
• Reduce the speed if it is too high for the application.
• Parameter 260, “Pos Accel Rate” = 100 rad/sec.
• Reduce the acceleration if it is too high for the application.
• Parameter 103, “Modulo Value” = the value in parameter 79.
ATTENTION
!
Use caution to avoid personal injury or damage
to equipment caused by unanticipated motor
rotation while changing motor parameters.