Rockwell Automation 2090 Ultra3000 Servo Drives Integration Manual - Manual (Page 143)

Publication 2098-IN005C-EN-P — March 2008
Minimizing the Effects of Feedback Signal Loss 143
units by using the Conversion ratio constant found in the Conversion
tab of the Axis Properties dialog.
The Position Error Tolerance parameter ride-through time setting is
fixed at 10 ms and is not adjustable through RSLogix 5000 software.
This setting defines the duration of time for which the position error
limit setting must be reached or exceeded before an Excess Position
Error (E19) is asserted.
RSLogix 5000 Position Error Tolerance Parameter
Adjust the Following Error Limit parameter if using Ultraware
software. This parameter is found in the Faults branch of the main
menu. The range for this parameter is 0…2147483647 interpolated
feedback counts, with a default value of 8000 interpolated feedback
counts.
You can convert a value expressed in interpolated feedback counts to
a number of axis revolutions by using the raw feedback count and
interpolation factor (if any) properties of the motor or encoder device
and of the Ultraware software Encoder branch. In Ultraware software,
the TTL encoder device interpolation factor is fixed at 1, so 2000 raw
feedback counts per revolution will result in 2000 interpolated
feedback counts per revolution. For the sin/cos encoder devices, the
interpolation factor is variable from 4 to 1024. The SR encoder devices
produce 1024 raw feedback counts per revolution, while the SK
encoder devices produce 128 raw feedback counts per revolution.
The resulting range of interpolated feedback counts per revolution is
512…1048576, depending on which sin/cos encoder device is used.
Interpolated feedback counts are the units used for the position and
velocity error limit parameters in the Ultraware software.
Adjust the Following Error Time parameter to specify a ride-through
time for the position error parameter. This setting defines the duration
of time for which the position error limit setting must be reached or
exceeded before an Excess Position Error (E19) is asserted. The range