ADLINK PCI-8164 User Manual

Page 98

Operation Theory

_8164_start_tr_move(AxisNo,5000,0,5000,0.001,0.001),

then use the following function:

_8164_verify_speed(0,5000,&minAccT, &maxAccT,5000);

The value miniAccT will be 0.0267sec and maxAccT will be
873.587sec. This minimum acceleration time does not meet the
requirement of 1mS. To achieve such a low acceleration time the
over speed value must be used.

By changing the OverVelocity value to 140000,

_8164_verify_speed(0,5000,&minAccT, &maxAccT,140000);

The value miniAccT will be 0.000948sec and maxAccT will be
31.08sec. This minimum acceleration time meets the require-
ments. So, the motion command can be changed to:

_8164_fix_speed_range(AxisNo,140000);

_8164_start_tr_move(AxisNo,5000,0,5000,0.001,0.001);

Notes:

The return value of _8164_verify_speed() is the mini-

mum velocity of motion command, it does not always equal
to your start velocity setting. In the above example, it will be
3pps more than the 0pps setting.

To disable the fix speed function
_8164_fix_speed_range() use
_8164_unfix_speed_range()

Minimize the use of the OverVelocity operation. the more it
is used, the coarser the speed interval is.