Boards Home > Motion Control & Watcdog Boards-SERVO-300
3-axis high speed servo motor control board
» Features
■ 3-axis V-command servo motor control board
■ 2500 points per axis for pitch error compensation
■ Provides simulation/open-loop/closed loop modes
■ Programmable trapezoidal speed profile
■ Programmable DDA cycle
■ Programmable direction configuration
■ Programmable home return speed, home preset, home direction
■ Linear interpolation/circular interpolation
■ Hardware failure detection
■ Software/Hardware emergency stop
■ 2500Vrms optical isolation
■ Auto protection for each limit switch
■ 8 digital inputs, 7 digital outputs.
■ Embedded CPU, totally 45-command set
» Functional Description
SERVO-300 is a 3-axis, command-type, servo control baord with quadrature encoder feedback.
The embedded CPU of SERVO-300 performs the motion commands transferred from PC via a 2K bytes FIFOs.
The CPU also send the information of position and status to the PC via another 2K bytes FIFOs.
This buffer provides enough data males this card suitable for widows operating system.
The SERVO-300 provides DOS and Windows drivers.
It is low cost and easy to ues while still provides comprehensive motion capability with high performance and relibility.
» Operating Mode
To developing your system easily, SERVO-300 board provides three operating mode :
simulation mode/open-loop mode/close-loop mode.
» Simulation mode
In simulation mode, the SERVO-300 control board will simulate the motion profile according to the motion commands received from host PC; and then the SERVO-300 will send the 3-axis positions back to host PC.
The SERVO-300 control board will not output V-command to motor driver.
The simulation mode can be operated with machine off.
The user can debug and develop the motion program beforehand.
And if the user has the daughter board DB-8R, it can also simulate the digital input/output like as a machine.
» Open loop mode
In open loop mode, user can directly output a constant voltage to servo driver to let the motor rotate at constant speed.
The constant value can be set by MSERVO3_CALV() command.
This mode can be used to tune the velocity loop gain or to drive the inverter.
» ControlClosed-loop mode
In closed-loop mode, the SERVO-300 performs the PD controller.
It also executes the following function.
1. Pitch error compensation
2. Limit switch auto-protection
3. Hardware failure detection
» Software DDA
For precise control and adjustable speed, the software DDA will divide the command into several equal delta commands.
The maximum command is 2040 pulse, so the maximum speed is 2040/(0.003*DDA) * 60/ENCODER. For example, DDA=4,
ENCODER=4000 pulse/rev. delta command=2040/4=508, pulse speed= 2040/(0.003*4)*60/4000 =2550 rpm
Therefore the maximum speed will be 2550 rpm while select DDA=4.
In case of the user want to increase the maximum speed that the servo driver is available, the DDA value should be reduced.
The maximum speed will be 5100 rpm if DDA=2. So, it is very important to select a proper DDA value for your system.
» Specifications Motion
● Number of axis : 3 axes
● Bits counter for encoder feed-back signal
● Position accuracy : ±1 quadrature count
● Output Type : 12-bit analog output with ±10V
● Control algorithm : PD control
● Sampling rate : 2.2ms for 3-Axis control system
● Forward, backware, home, limit switch per axis
● Programmable limit switch state : N.O. or N.C.
General Purpose I/O
● 8-channel isolation digital input
● Input voltage : 0~24V
● 7-channel open collector output
● 2500Vrms optical isolation I/O connector
● Connector 1 : D-sub 25-pin connector for encoder input
● Connector 2 : D-sub 9-pin connector for X,Y pulse output and servo-on signal
● Connector 3 : D-sub 9-pin connector for Z pulse output, limit switchs and server-on signal
● Connector 4 : D-sub 25-pin connector for limit switches, digital input and digital output General Specifications
● Power requirements : +5V @ 500 mA (typical)
● Operating temperature : 0°C ~ 60°C
● Operating humidity : 0% ~ 90% non-condensing
● Storage temperature : -20°C ~ 70°C
● Dimensions : 208 mm x 121 mm
Ordering Information Standard SERVO-300 : 3-axis servo motor control board Optional DB-200 : Encoder interface I/O board DB-8R : Motion interface I/O board DN-25 : DIN-rail mounting screw terminal board
