drive offsets 2:
TO CHECK VCMD VIA FOLLOWING ERROR CHECK:
CAT I: Go to the SYSTEM SETUP X, Y AND Z enter a 1 in the MDI GAIN touch field.
Go to the POWERFEED screen then SET FEED AND DIST screen and set up a powerfeed rate of 20 IPM and a distance of 4 inches (if the machine can move this distance safely).
Turn the velocity override pot to zero.
Turn drives on.
Go back to the POWERFEED screen and start a jog move in the axis to be check.
Go to the PI, DI, VI, FE screen.
Turn the override pot to max; look at the following error (third line from the top). If the machine is going 20 IPM, the following error should be .020.

If the following error is not correct, you can either change the VCMD number on the SYSTEM MACHINE X, Y, OR Z screen to get the right following error, or change the velocity adjustment in the drive. Check the other two axes. To set new a VCMD number use the following formula.

New VCMD = (Old VCMD X Following Error)/(IPM/1000)

For example, if the Old VCMD was 5.00 and following error was .018 with the machine at 20 IPM, the new VCMD value to enter is,

New VCMD = (5.00 x 0.018)/(20/1000) = 4.50

Enter 4.50 in VCMD.
Go to the SYSTEM COMMON 1 screen.
Turn the integrators on by touching INTEGRATORS, then 1.
Go to the SYSTEM SETUP MENU and touch the CLEAR CODE touch field in the bottom right corner of the screen.

CAT II: Go to the SYSTEM SETUP/N.C. PARAMETERS enter a 1 in the X, Y, and Z MDI GAIN touch field (if not 0 record value to reenter later). Go to the MANUAL MOTION screen then select JOG FEED and go to the PARAMETERS screen. Set up a jog feed rate of 20 IPM and a distance of 4 inches (if the machine can move this distance safely). Turn the velocity override pot to zero.




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