ACU-RITE CSS I/O Users Manual - Manual (Page 19)

CSS I/O 17
I - 3 Contr
o
lling the Constant Surf
ace Speed (CSS)
Activating the DAC output
After selecting the operating mode and entering its parameters, the
DAC output must be enabled to begin controlling the spindle.
The output to the spindle inverter drive is an open loop signal. The
system does not monitor the actual spindle speed. The output signal
is based solely on the inverter's speed input versus the input voltage
profile.
8 Depending on the operating mode selected, the RPM or CSS soft
key is displayed on the fourth page of the soft key menu. If the
current state indicated on the soft key is ON, the DAC output is
active. Press the soft key to OFF to disable the spindle control.
If CSS is active, the CSS icon appears next to the X-axis display. If the
entered surface speed or rpm cannot be maintained because the
speed is outside the range for the current gear or outside the limits
from the CSS/RPM SETTINGS form, an arrow will appear after the
CSS icon (
or ). The direction of the arrow indicates
whether the speed is at the upper or lower limit.
The SPEED + and SPEED – soft keys are used to increase or decrease
the current surface speed or spindle speed. The value is increased or
decreased by 5% each time the soft key is pressed.
The soft key to enable CSS or RPM control will not appear
if the operating mode is set to OFF.
If the CSS control parameter under INSTALLATION SETUP
is set to EXTERNAL, the CSS or RPM operation cannot be
controlled by soft key. The soft key will show the current
state, but pressing it will have no effect.