User`s manual

efficient
stages
The AX-2550 includes two high-efficiency Power Output stages which can operate
from 12 to 40VDC. Each of these stages supports the following advanced features:
Precise, Smooth, Forward/Reverse Control
High efficiency MOSFET “H-Bridges” are used for full forward and reverse opera-
tion. The controller uses Pulse Width Modulation at 16kHz to generate smooth, vari-
able output power in as little as 0.5% increments.
120 SmartAmps per Channel
The AX2550 features intelligent current sensing and control. After an initial surge
allowed up to over 200A per motor, the controller will limit the power to 120A for
the time typically required to accelerate or brake the robot. If the motor’s current
draw remains excessive after that time, as in the case of stalled motor or other
unusual loading, the controller will gradually reduce the power based on the meas-
ured MOSFET’s temperature. The MOSFET transistors are mounted directly against
the heat-sinking extruded aluminum case for efficient cooling without the need of a
fan in most applications.
Controlled Motor Acceleration
The AX2550 can also be configured to automatically “smooth” command changes
(from stop to full speed, for example) to avoid sudden overloads on the controller,
the batteries and/or the robot’s mechanical components.
power output
multiple
modes
Tachometer
Speed Feedback
Potentiometer
Gear box
Position Feedback
Open Loop Speed mode
In this mode, the controller delivers an amount of power proportional to the
command information. The actual motor speed is not measured. This mode is
adequate for most applications where the operator maintains a visual contact
with the robot.
Closed Loop Speed mode
In this mode, an analog tachometer measures the actual motor speed. If the
speed changes because of changes in load, the controller automatically com-
pensates the power output. This mode is preferred in precision motor control
and autonomous robotic applications.
Closed Loop Position mode
In this mode, the axle of a geared down motor is coupled to a potentiometer
that is used to compare the angular position of the axle versus a desired posi-
tion. This unique feature makes it possible to build ultra-high torque “jumbo ser-
vos” that can be used to drive steering columns, robotic arms, life-size models
and other heavy loads.
motion
For each channel, the AX2550 supports multiple motion control modes: