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Geo Brick Drive User Manual
Pinouts and Software Setup
142
Homing with Yaskawa Incremental Encoders
Hardware capture is not available with serial data encoders, software capture (Ixx97=1) is required.
Setting Ixx97 to 1 tells Turbo PMAC to use the register whose address is specified by Ixx03 for the
trigger position. The disadvantage is that the software capture can have up to 1 background cycle delay
(typically 2-3 msec), which limits the accuracy of the capture. To alleviate homing inaccuracies with
serial encoders, it is recommended to perform home search moves at low speeds.
Homing to a flag (i.e. Home, Overtravel Limit, and User) is done using the traditional capture parameters
I7mn2, and I7mn3. Remember to (temporarily) disable the end of travel limit use (bit#17 of Ixx24) when
homing to one of the hardware limit flags, and re-enabling it when homing is finished. Example:
Homing channel 1 to the negative limit (high true)
I124=I124|$20001
; Flag Mode, Disable hardware over travel limits
I197=1
; channel 1 position capture, software
I7012=2
; Channel 1 capture control, capture on flag high
I7012=2
; Channel 1 capture flag select, minus or negative end limit
Homing to the index pulse, normally performed after referencing to a hardware flag, is an internal
function of the Yaskawa encoder. Bit 14 of the alarm code indicates whether the index has been detected
since last power-up. The motor should be jogged until bit 14 is low, the encoder will then place the
“incremental compensation” value in the lower 11 bits of the second data word. Subtracting the
“incremental compensation” from the “incremental position” results into the true position of the index.
Motor 1 index detection example plc:
#define FirstWord M7025
#define SecondWord M7026
#define OriginNotPassed M7027
FirstWord->Y:$78B20,0,24
SecondWord->Y:$78B21,0,24
OriginNotPassed->Y:$78B22,14
#define Mtr1ActPos M162 ; Suggested M-Variable Definition, Motor 1 Actual Position
Mtr1ActPos->D:$00008B
; #1 Actual position (1/[Ixx08*32] cts)
open plc 1 clear
if (OriginNotPassed = 1)
cmd "#1j+"
; Jog in positive direction looking for index
while (OriginNotPassed = 1); wait until index is detected
endwhile
cmd "#1k"
; Kill Motor
endif
while (SecondWord & $8FF = 0) ; Incremental Compensation takes up to 2 msec to execute
endwhile
Mtr1ActPos = int (((FirstWord & $8FFFC0) / $40)-((SecondWord & $8FF) * $40))* I108 * 32
disable plc 1
close
Содержание Geo Brick
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Страница 286: ...Geo Brick Drive User Manual Appendix A 286 APPENDIX A Schematic Samples Watchdog X15 Inputs J6 J7...
Страница 287: ...Geo Brick Drive User Manual Appendix A 287 Outputs J6 J7 603793 109 and earlier Outputs J6 J7 603793 10A and later...
Страница 288: ...Geo Brick Drive User Manual Appendix A 288 Limits Flags J4...