Rockwell Automation 20D PowerFlex 700S Drive Ph I Control, Frames 1...11 - Manual (Page 88)

3-34 Programming and Parameters
241 Encdr1 Spd Fdbk
Displays the speed feedback from Encoder 1. Calculated from the change of Par 240
[Encdr1 Position] and Par 242 [Encoder1 PPR].
Units:
Default:
Min.Max:
Comm Scale: RPM
0
-/+14112.0000
Par 4 [Motor NP RPM] = 1.0 Real
242 Encoder1 PPR
Sets the PPR rating of the feedback device connected to the Encoder 1 input.
Units:
Default:
Min/Max: PPR
1024
10/20000 16-bit
Integer
243 Encdr1 Config
Specifies the configuration options for the Encoder 1.
• Bits 0 [Enc Filt bt0], 1 [Enc Filt bt1], 2 [Enc Filt bt2], and 3 [Enc Filt bt3] configure encoder input filter (see
Table 243A: Trigger Source Settings ). The filter
requires the input signal to be stable for the specified time period. Input transitions within the filter time setting will be ignored.
• Bits 4 [Encdr 4x] and 5 [Encdr A Phs] determine how the encoder channel A and B signals will be interpreted. Typically, both encoder phases A and B are
used so that direction information is available. The Par 240 [Encdr1 Position] counts up for forward rotation and down for reverse rotation. If bit 5 is set, then
the B phase signal is ignored. As a result, the encoder position will only increase, regardless of rotation direction. Bits 4 and 5 together also determine the
number of edges counted per encoder pulse (see
Table 243B: Encoder Sample Interval Settings ). "4x" sampling counts both rise and fall of both A and B
encoder phases, hence 4 edges per pulse. In 4x mode, the encoder position will change by four times the encoder pulses per revolution rating (PPR) per
encoder revolution (e.g., it increments the value in Par 240 [Encdr1 Position] by 4096 for one revolution of a 1024 PPR encoder).
• Bit 6 [Encdr Dir] inverts the channel A input, thus reversing the direction of the feedback.
• Bit 9 [Edge Time] configures the method of sampling used by the Velocity Position Loop (VPL). Setting the bit chooses "Edge to Edge" sampling, while
resetting the bit to zero chooses "Simple Difference" sampling. "Simple Difference" sampling calculates speed by examining the difference between pulse
counts over a fixed sample time. "Edge to Edge" sampling adjusts the sample time to synchronize with the position count updates from the daughter card -
improving the accuracy of the speed calculation.
• Bits 12 [SmplRate bt0] through 15 [SmplRate bt3] configure the sample interval for measuring speed (see
Table 243C: Channel Interpretation Settings ).
Increasing the encoder sample interval improves speed measurement near zero speed. Decreasing allows the speed control regulator to perform with high
gains at high speeds.
No.
Name
Description
Values Li
nkab
le
Read
-Wr
it
e
Da
ta
T
ype
Options
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
Rese
rv
ed
SmplRate bt3 SmplRate bt2 SmplRate bt1 SmplRate bt0 Rese
rv
ed
Rese
rv
ed
Edge Time Rese
rv
ed
Rese
rv
ed
Encd
r Dir
Encd
r A Phs
Encd
r 4x
Enc
Filt
bt3
Enc
Filt
bt2
Enc
Filt
bt1
Enc
Filt
bt0
Default 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 0 0 0 0 1 1 0 1 0
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
0 = False
1 = True
Table 243A: Trigger Source Settings
Bit 3 2 1 0 Input Filter Setting
0 0 0 0 Filter disabled
0 0 0 1 100 ns filter
0 0 1 0 200 ns filter
0 0 1 1 300 ns filter
0 0 1 1 300 ns filter
0 1 0 0 400 ns filter
0 1 0 1 500 ns filter
0 1 1 0 600 ns filter
0 1 1 1 700 ns filter
1 0 0 0 800 ns filter (default setting)
1 0 0 1 900 ns filter
1 0 1 0 1000 ns filter
1 0 1 1 1100 ns filter
1 1 0 0 1200 ns filter
1 1 0 1 1300 ns filter
1 1 1 0 1400 ns filter
1 1 1 1 1500 ns filter
Table 243C: Channel Interpretation Settings
Bit 15 14 13 12 Encoder Sample Interval Settings
0 0 0 0 0.5 ms
0 0 0 1 0.5 ms (min. setting)
0 0 1 0 1.0 ms
0 0 1 1 1.5 ms
0 1 0 0 2.0 ms (default setting)
0 1 0 1 2.5 ms
0 1 1 0 3.0 ms
0 1 1 1 3.5 ms
1 0 0 0 4.0 ms
1 0 0 1 4.5 ms
1 0 1 0 5.0 ms
1 0 1 1 5.5 ms
1 1 0 0 6.0 ms (max. setting)
1 1 0 1 6.0 ms
1 1 1 0 6.0 ms
1 1 1 1 6.0 ms
Table 243B: Encoder Sample Interval Settings
Bit 5 4 Mult. Directions Comments
0 0 2x fwd/rev Counts rise/fall of phase A, phase B only used to find
direction
0 1 4x fwd/rev Counts rise/fall of both A and B phases (default setting)
1 0 1x fwd only Counts rise of phase A. Phase B ignored.
1 1 2x fwd only Counts rise of phase A. Phase B ignored.