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AX2500/2850 Motor Controller Overview
22 AX2500/2850 Motor Controller User’s Manual Version 1.7. February 1, 2005
The motors are driven using high-efficiency Power MOSFET transistors controlled using
Pulse Width Modulation (PWM) at 16kHz. The AX2500/2850 power stages can operate
from 12 to 40VDC and can sustain up to 120A of controlled current, delivering up to
4,800W (approximately 6 HP) of useful power to each motor.
The many programmable options of the AX2500/2850 are easily configured using one-
touch Program and Set buttons and a 7-segment LED display. Once programmed, the con-
figuration data are stored in the controller's non-volatile memory, eliminating the need for
cumbersome and unreliable jumpers.
The AX2850 is the AX2550 controller fitted with a dual channel optical encoder input mod-
ule. Optical Encoders allow precise motor speed and position measurement and enable
advance robotic applications.
Technical features
Fully Digital, Microcontroller-based Design
• Multiple operating modes
• Fully programmable using either built-in switches and 7 segment display or through
connection to a PC
• Non-volatile storage of user configurable settings. No jumpers needed
• Simple operation
• Software upgradable with new features
Multiple Command Modes
• Radio-Control Pulse-Width input
• Serial port (RS-232) input
• 0-5V Analog Command input
Multiple Advanced Motor Control Modes
• Independent operation on each channel
• Mixed control (sum and difference) for tank-like steering
• Open Loop or Closed Loop Speed mode
• Position control mode for building high power position servos
• Modes selectable independently for each channel
Automatic Joystick Command Corrections
• Joystick min, max and center calibration
• Selectable deadband width
• Selectable exponentiation factors for each joystick
• 3rd R/C channel input for weapon and accessory output activation
Special Function Inputs/Outputs
• 2 Analog inputs. Used as