Reference Manual Owner's manual

Rockwell Automation Publication 750-RM001F-EN-P - February 2012 57
General Device and Feedback Monitoring Configuration Chapter 5
Dual Feedback Speed Discrepancy Tolerance
The Dual Feedback Speed Discrepancy Tolerance P40 [Fbk Speed Tol], defines
the discrepancy that will be tolerated for a difference in speed between encoder 1
and encoder 2. This speed is relative to encoder 1. This discrepancy checking is
performed only while the Feedback mode is equal to one of these values.
For rotary systems, the value is specified in revolutions per minute. For linear
systems, the value is specified in mm per second.
If an illegal value is detected, an Invalid Configuration fault occurs and the safety
option remains in the Safe State.
Feedback Voltage Monitor Range
Use the P32 [Fbk 1 Volt Mon] and P37 [Fbk 2 Volt Mon] parameters to set the
feedback voltage monitoring range. The monitoring ranges help define the trip
zone for encoder 1 and encoder 2, respectively.
Your power supply must stay within the No Trip range.
Feedback Mode, P27 [Fbk Mode] Parameter Settings
1 Dual encoder with speed and position discrepancy checking
2 Dual encoder with speed discrepancy checking
Feedback Mode, P27 [Fbk Mode] Parameter
Values
Dual Feedback Speed Discrepancy Tolerance, P40 [Fbk
Speed Tol] Parameter Values
0One encoder 0
1 Dual encoder with speed and position
discrepancy checking
0.1…6553.5 in rev/min (rotary encoders) or mm/s (linear
encoders)
2 Dual encoder with speed discrepancy
checking
0.1…6553.5 in rev/min (rotary encoders) or mm/s (linear
encoders)
3 Dual encoder with position discrepancy
checking
0
Fbk x Volt Mon
Setting
5 9 12 14
Range 4.5…5.5V 7…12V 11…14V 11.5…15V
Trip Zone < 4.5V < 7V < 11V < 11.5V
The encoder must be specified May Trip 4.5…4.75V 7…7.4V 11…11.6V 11.5…12.25V
to operate across this complete No Trip 4.75…5.25V 7.4…11.4V 11.6…13.3V 12.25…14.75V
range or larger. May Trip 5.25…5.5V 11.4…12.0V 13.3…14.0V 14.75…15.5V
Trip Zone >5.5V > 12.0V >14.0V >15.5V