Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual - Manual (Page 58)

58 Rockwell Automation Publication 750-RM001F-EN-P - February 2012
Chapter 5 General Device and Feedback Monitoring Configuration
Feedback Fault
The allowable frequency of feedback input signals is limited. The safety option
monitors feedback signals whenever its configuration is valid and the Safety
mode is not configured as Disabled.
If the feedback signals indicate greater than or equal to the maximum value, a
Feedback_
x fault (Safe State fault) occurs.
(
x equals 1 or 2 depending upon which encoder has the fault.)
Diagnostics are performed on the encoder input signals. If the encoder diagnostic
tests fail, a Feedback_
x fault (Safe State fault) occurs.
Feedback Parameter List To define the type of feedback used by the safety option, set these parameters.
Encoder Type Maximum Frequency
Sine/cosine ≤ 100 kHz
Incremental
≤ 200 kHz
Fil
e
Gr
ou
p
No. Display Name
Full Name
Description Values
Re
ad
-Write
Da
ta
T
yp
e
HOST GROUPS
Fe
edback
27 Fbk Mode
Feedback Mode
Selects the number of feedback devices and the type of discrepancy checking.
“Single Fbk” (0) - 1 Encoder
“Dual S/P Chk” (1) - 2 Encoders with Speed and Position Discrepancy Checking
“Dual Spd Chk” (2) - 2 Encoders with Speed Discrepancy Checking
“Dual Pos Chk” (3) - 2 Encoders with Position Discrepancy Checking Default:
Options: 0 = “Single Fbk”
0 = “Single Fbk”
1 = “Dual S/P Chk”
2 = “Dual Spd Chk”
3 = “Dual Pos Chk” RW 8-bit
Integer
28 Fbk 1 Type
Feedback 1 Type
Selects the type of feedback for encoder 1.
When using the Safe Speed Monitor module with a 20-750-UFB-1 Universal Feedback
module, set this parameter to 0 “Sine/Cosine” and ensure that the Universal Feedback
module is set to a Sine/Cosine type device (P6 [FB0 Device Sel] and/or P36 [FB1 Device
Sel]). Default:
Options: 1 = “TTL”
0 = “Sine/Cosine”
1 = “TTL” (Incremental) RW 8-bit
Integer
29 Fbk 1 Units
Feedback 1 Units
Selects rotary or linear feedback for encoder 1. Default:
Options: 0 = “Rev”
0 = “Rev” (Rotary)
1 = “mm” (Linear) RW 8-bit
Integer
30 Fbk 1 Polarity
Feedback 1 Polarity
Defines the direction polarity for encoder 1. Default:
Options: 0 = “Normal”
0 = “Normal” (Same as encoder)
1 = “Reversed” RW 8-bit
Integer
31 Fbk 1 Resolution
Feedback 1 Resolution
Counts/Revolution.
1…65,535 pulses/revolution or pulses/mm based on rotary or linear configuration
defined by P29 [Fbk 1 Units]. Default:
Min/Max: 1024
1 / 65,535 RO 16-bit
Integer