USA57 Revision
1.2
59
Command:
aC
Position Correction Mode Deadband Value
Type:
System Control Command
Syntax: aC
n
Range:
n = 0 to 65000 quadrature encoder counts
Initial Value:
50 quadrature encoder counts
Description:
Sets the allowable position correction mode deadband for the coarse positioning
motion. When in position correction mode, this is the position error the motor is
allowed to be off (in quadrature encoder counts) before the motor will try to
correct itself. The “
aC
” value is monitored continuously while the motor is in
motion and is used to determine if the motor has been stalled. See Appendix E.
Encoder Quadrature Count= (encoder counts/rev) * 4
For example, a stepping motor is hooked up to a 400-line encoder.
Therefore, aC= 400 x 4 = 1570 quadrature encoder counts
Note:
The microstep resolution must be set to the divide by 256 value “
j256
” in
order for correct operation of the feedback mode.
Example:
/1
aC
100R<CR>
“/”
Is the start character. Lets Accuriss know that a command string will follow.
“1”
Is the device address, (this is preset at the factory).
“aC100” Sets the position correction deadband value to 100 quadrature encoder
counts
“R”
Instructs Accuriss to run the command(s) that are in the communication buffer.
“<CR>” Tells Accuriss that the command string is complete and causes the command to
be executed since an R is included in the command string.