ACU-RITE CSS I/O Users Manual - Manual (Page 17)

CSS I/O 15
I - 3 Contr
o
lling the Constant Surf
ace Speed (CSS)
Configuration of CSS
To use the CSS functionality, the last axis must be defined as a rotary
axis. Define the display as a speed display, and configure them
accordingly. The spindle control configuration parameters are set up
in the INSTALLATION SETUP menu.
8 Select the CSS SETTINGS parameter to open the associated input
form
8 The CSS ON/OFF CONTROL field is used to specify whether the
CSS mode is operated by soft key or by an external hardware signal.
8 The current gear may be selected by local control (MANUAL via
CSS / DIRECT RPM in the JOB SETUP menu) or remote control
(EXTERNAL; via switches in the machine gear). This is defined in the
CSS GEAR SELECT field.
8 The VOLTAGE OFFSET function is used to adjust for any inherent
offset in the DAC signal. Using a voltmeter, measure the actual
voltage at the DAC output. Press INCREASE or DECREASE to adjust
the offset until the output is 0 V. The offset range is limited from 0
to 100 (approximately 0 to 244mV).
8 The VOLTAGE / RPM fields are used to establish the relationship
between the DAC output signal (0 to 10 V) and the spindle speed.
The minimum and maximum limits for each gear are entered.
If the position display of the third axis is configured to be used for the
spindle speed, the rpm in the SETTING field can be set to the current
spindle speed by pressing the TEACH soft key.
To set a specific spindle speed, the DAC output S
Out
uses this linear
relationship to determine the corresponding output voltage V
Out
:
V
Out
= 10 · (S
Out
- S
0
) / (S
10
- S
0
) + V
Offset
Press ENTER to save the parameters and exit the input form. Press
the C key to exit without saving the changes you made.