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Geo Brick Drive User Manual
Motor Setup
188
Absolute Power-On Phasing: EnDat | SSI | BiSS
With absolute serial encoders, the absolute serial data can be used to establish a phase reference position
on power-up without moving the motor or executing a phase search move.
The automatic setup of power-on phasing with PMAC is established through finding the motor’s phase
offset (a one-time test per installation) and storing the result (scaled properly) in the phase position offset
register (Ixx75). It also requires specifying the power-on phase source (Ixx81), and format (Ixx91).
The following, is a summary of the settings with the various proposed setup techniques:
Technique 1
Technique 2/3
(Ixx01=1)
For Ixx01= 3
For Ixx01= 1
PhaseOffset
(found experimentally)
Read from
Serial data register A
Read from
Position ECT result
Read from
Commutation ECT result
Ixx81
= Serial data register A = Ixx83 (Pos. ECT result)
= Comm. ECT result
Ixx91
= Unsigned, Y-register
ST bits
= Unsigned, X-register,
(ST + 5bit shift) bits
= Unsigned, X-register,
18 bits
Ixx75
= ( - PhaseOffset * Ixx70 ) % Ixx71
Note
The automatic power-on phasing routine (Ixx75, Ixx81, and Ixx91)
expects the least significant bit of the data to be right most shifted (at
bit 0).
Remember that the serial data register A address for each of the channels is:
Serial Data Register A
Channel 1 Y:$78B20 Channel 5 Y:$78B30
Channel 2 Y:$78B24 Channel 6 Y:$78B34
Channel 3 Y:$78B28 Channel 7 Y:$78B38
Channel 4 Y:$78B2C Channel 8 Y:$78B3C
Caution
Prior to implementing an absolute power-on phasing routine, make
sure that the motor can be phased manually, and that open-loop and/or
closed-loop moves (require PID tuning) can be performed
successfully.
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...