AX2550 / AX2850 Dual 120 SmartAmps per Channel, Brushed DC Motor Controller   Datasheet

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Product Description

Roboteq’s AX2550 controller and its AX2850 variant are designed to convert commands received from a R/C radio, Analog Joystick, wireless modem, or microcomputer into high voltage and high current output for driving one or two DC motors. Designed for maximal ease-of-installation, it is delivered with all necessary cables and hardware and is ready to use in minutes.

The controller's two channels can either be operated independently or mixed to set the direction and rotation of a vehicle by coordinating the motion on each side of the vehicle. The motors may be operated in open or closed loop speed mode. Using low-cost position sensors, they may also be set to operate as heavy-duty position servos.

The AX2850 version is equipped with quadrature optical encoders inputs for precision speed or position operation. Numerous safety features are incorporated into the controller to ensure reliable and safe operation.

A high efficiency version is also available for higher current operation in extended temperature environment.

The controller can be reprogrammed in the field with the latest features by downloading new operating software from Roboteq.

Technology Information

Detailed description of the technology and features of all AX-family controllers can be found on the Technology page

	AX2550	AX2550HE	AX2550SC	AX2550HESC	AX2850	AX2850HE	AX2850SC	AX2850HESC
Power Stage
Operating Voltage	12V to 40V DC
Number of Channels	2	2	1	1	2	2	1	1
Max Current   30s   1min   3 min   1h & more	120A 100A 80A 60A	140A 120A 100A 80A	240A 200A 160A 120A	280A 240A 200A 160A	120A 100A 80A 60A	140A 120A 100A 80A	240A 200A 160A 120A	240A 200A 160A 120A
Surge Current	>250A	>500A	>500A	>1000A	>250A	>500A	>500A	>1000A
MOSFETs per Channel	8	16	2 x 8	2 x 16	8	16	2 x 8	2 x 16
ON Resistance	5 mOhm	2.5 mOhm	2.5 mOhm	1.25 mOhm	5 mOhm	2.5 mOhm	2.5 mOhm	1.25 mOhm
Synchronous Rectification	Yes - Allows regenerative braking
Current Limiting	By automatic power output reduction according to user preset limit and temperature
Temperature protection	Automated current limit reduction starting at 80o C (175o F) case temperature
Voltage protection	Output shut off below 12V and above 43V
Power Wiring	8 AWG wires		8 AWG wire pairs		8 AWG wires		8 AWG wire pairs
Command
R/C Inputs	2 + 1 accessories (1.0ms - 1.5ms center - 2ms, Adjustable)				2 inputs (1.0ms - 1.5ms center - 2ms, Adjustable)
Serial Interface	RS232. 9600 bauds
Analog Interface	2 inputs (0V - 2.5V center - 5V)
Input Corrections	Ch1 & Ch2 mixing for tank steering. Programmable deadband. 4 Exponent & Logarithmic command curves.
Input/Outputs
Optical Encoder Interface	May be added as option				4 Inputs for 2 incremental encoders. 125kHz max
Analog Inputs	2 inputs, 8-bit resolution
Digital Outputs	1 output, 24V 2A max.
Digital Inputs	3 general purpose inputs				2 general purpose inputs.
5V Supply Output	100mA max for Radio or other devices				100mA max for Encoders, Radio or other devices
Operating Modes
Open Loop Speed	Forward & Reverse Speed Control. Separate or Mixed
Closed Loop Speed	Use Tachometer on analog inputs & PID				Use Tachometer on analog inputs or Optical Encoder & PID
Position Mode	Use Potentiometer on analog inputs & PID				Use Potentiometer on analog inputs or Optical Encoder &PID
Controller Configuration	Jumper-less. Configuation using built-in switch and LED display or PC utility
Physical
Operating Temperature	-40 to +85oC case temperature
Enclosure	Heat-sinking Aluminum Extruded Case
Controller size	5.5" (140mm) wide x 1.6" (40mm) tall x 9" (228mm) long including mounting brackets
Cables	10" (25cm) RC cable to Radio. 4' (1m) RS232 cable for PC connection
Weight	3.3lbs (1.5kg)
	AX2550	AX2550HE	AX2550SC	AX2550HESC	AX2850	AX2850HE	AX2850SC	AX2850HESC

Download

Product Documentation
Document	Description	Version	Date	Size	Get
AX2550 Datasheet	Product description and specifications	1.9b	10/10/05	2 pages - 570K
AX2550 Quickstart Manual	Summary product installation and operation manual	1.9b	06/01/07	11 pages - 1.32M
AX2550 Users Manual	Detailed product installation and operation manual - Registration Required	1.9b	06/01/07	180 pages - 3.7M

Operating Software
File	Description	Version	Date	Size	Get
roboenc17-020105	Encoder module Firmware for AX3500/2850 & Encoder Module	1.7	02/01/05	3K
roboup19b-060107	Controller Firmware for AX500/1500/2550/2850/3500	1.9b	06/01/07	10K
roborun-setup19b	PC Utility for all Roboteq Controllers, including Firmware	1.9b	06/01/07	3.4M

Application Notes
Document	Description	Pages & Size	Get
AN1001	Switching RS232 to RC Mode on-the-fly	2 pages - 320K
AN1003	Understanding the AX2550 Thermal Behavior	6 pages - 355K
AN70417	Gravity Alignment of an X-Y platform	2 pages - 501K
AN70614	Understanding Regeneration	18 pages - 902K