ADLINK AMP-208C - Manual (Page 154)

Motion Control Theory 140
AMP-204C / AMP-208C
4.9.3 PWM Control (Laser Control) (VAO Table Control)
4.9.3.1 Structure Overview
Laser cutting is now commonly applied in various metal, non-metal,
and composite material processing. The application is highly
associated with motion control. To meet this requirements the VAO
module is offered by ADLINK's DSP-based motion control card. The
VAO module enables quality cutting by controling laser intensity
with speed information. In general, laser intensity is commonly
controlled by pulse-width modulation (PWM). ADLINK's DSP-based
motion control card features multiple types of PWM controls for
specific applications.
See figure below for the operation of VAO module. The VAO
controller monitors PWM output with VAO table at different
speeds. Your AMP-204C / AMP-208C features two VAO
controllers with output channels that you can set as required. This
enables it to output the same or different PWMs in multiple
channels concurrently. Each VAO controller may switch among
different VAO table to meet the multi-level cutting requirements.
Your AMP-204C / AMP-208C features eight VAO tables, Table
0~7, to come up with corresponding PWM settings, by
interpolating composite speed among multiple axes, for laser
output intensity control. Source of speeds may come from
individual axes' command or feedback velocity where the noise
may be removed by embedded filters. The refresh frequency of
feedback speed is 1KHz now. The VAO module can work together
with the Point table.
Please set up PWM control mode and VAO table before using the
VAO module. Please set up function parameters with the VAO
parameter table. See below for descriptions and setup
procedures.