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Motorola M68HC08 User Manual

Page 142

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User Guide

Designer Reference Manual

DRM028 — Rev 0

142

User Guide

MOTOROLA

9. If CURR_PIREG_P_GAIN is set to 128, do further proportional

gain increase CURR_PIREG_P_GAINSCALELEFT with PC
master software, steps 0, 1, 2...8, otherwise leave
CURR_PIREG_P_GAINSCALELEFT as 0

10. Increase, step by step, the integral gain CURR_PIREG_I_GAIN

with PC master software, up to current oscillation or noise, or up
to 128

11. If CURR_PIREG_I_GAIN is set to 128, do further integral gain

increases to CURR_PIREG_I_GAINSCALELEFT with PC master
software, steps 0, 1, 2...8; otherwise, leave
CURR_PIREG_I_GAINSCALELEFT as 0

12. You can further evaluate the setting of the regulator parameters in

order to get a smoother current waveform, or until the regulation
seems to be performing well

13. Open const_cust_x.h and modify the regulator parameters with

the final variable values evaluated with PC master software

14. Change the software back to normal: in code_start.c file, label

TUNING_1 remove goto (modify as comment): /* goto Align */ (it
will allow finishing Alignment state when alignment period ends)

15. Build the code (see

Software Execution

,

Build

)

16. You can also tune regulator dynamic characteristics of current

transients (steps

17.

to

26.

) or finish the regulators tuning

17. Run the code (see

Software Execution

and

Execute from

Evaluation Board

)

18. Start the PC master software tuning project

19. Select Current Parameters Tuning subproject (see

Software

Parameters Tuning with PC Master Software Project File

) in

order to be able to modify the current regulator

20. You can see the actual current (and required alignment current)

on the Current Parameters Tuning\New Scope, or measure the
powered motor coil current on real oscilloscope

21. Set PC master software control mode and start motor (see

Application Control

and

PC Master Software (Remote)

Operating Mode

)

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Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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