Servo Amplifiers mount on equipment circuit boards.

Press Release Summary:

Digital Accelnet(TM) Micro products drive servo positioning motors in industrial automation. Compact design enables each amplifier to be located close to motor it drives, minimizing RFI, and includes CANopen networking control of multi-axis motion and built-in Java indexer software. For single-axis torque and velocity control, amplifier accepts ±10 V analog control signals and digital PWM inputs. Output ranges are 20-55 V or 20-90 V, depending on current.

Original Press Release:

Accelnet(TM) Micro ServoAmp Small Enough To Mount On Equipment Circuit Boards

Advanced servo amplifier covers single axis servomotor control, multi-axis networked servomotor control, and built-in Java indexing software for creating menu of automation sequences.

Copley's all-digital Accelnet(TM) Micro servo amplifiers drive servo positioning motors in industrial automation. Owing to its ultra small size, the amplifier fits on the same printed circuit board as automation system interface, control, and power supply circuits. Compact design enables each amplifier to be located close to the motor it drives, simplifying wiring and minimizing RFI. Output ranges are 20 - 55V at 3A continuous and 6A peak, or 20 - 90V at 2A continuous and 4A peak.The Accelnet(TM) Micro servo amplifier introduces CANopen networking control of multi axis motion, reducing equipment complexity and cost. New built-in indexer software permits user-creation of versatile menu of motor positioning commands-system control computer selects from menu to activate intricate motion sequences. The amplifier also provides flexibility in stand-alone, single axis motion control. For single axis torque and velocity control, the amplifier accepts both ±10V analog control signals and digital PWM inputs. In its position mode, step-and-direction inputs enable system builders to replace stepper motors with faster, higher power servomotors.

Canton, MA, November 29th, 2004-Copley Controls introduces the ultra compact CANopen compatible Accelnet(TM) Micro servo amplifier. The amplifier's extreme miniaturization enables it to fit on the same PCB as interface, control, and power supply circuits, shrinking the size of automation systems. The compact design enables each amplifier in a multi-axis automation to be located close to the motor it controls, reducing wiring cost and minimizing RFI. By introducing networking control of multi axis motion, Accelnet(TM) Micro further simplifies equipment complexity and cost. Notably, for such a small package, DSP-based Accelnet(TM) Micro embodies the key features of full size CANopen-compatible servo amplifiers.

Accelnet(TM) Micro servo amplifiers also provide considerable flexibility in stand-alone, single axis motion control. For torque and velocity control operation, the amplifier accepts ±10V analog control signals and also digital PWM inputs. In the position mode, Step-and-Direction inputs enable equipment builders to replace stepper motors with faster, higher power brushless servomotors.

Motor Control Via CAN & CANopen

All Accelnet(TM) Micro servo amplifiers communicate with the control PC-and with each other-via a rugged twisted pair CAN data link. A low cost communications card provides the interface (modem) between bus and control PC.

The CAN bus originally proved its reliability through years of automobile use. More recently, the basic CAN network has been further enhanced with an international standard CANopen motion application layer to meet the needs of more sophisticated industrial applications. All motor commands to and from the control PC travel over the two wire bus. In addition, the network enables amplifiers to communicate directly with one another.

Free Java Software Components Automate Motion Sequencing

Copley has included Java software components to the amplifier's CME 2(TM) setup CD that Copley provides with new amplifiers. The Java components enable a menu of motion steps to be loaded into the amplifier's memory. System control computers can now select a pattern of positioning motions from the menu and put them into action with a simple GO command. Elaborate computer software engineering is replaced by simple Java components; transmission of complex sequencing software to the amplifier is eliminated.

Copley Motion Libraries and COM Objects

Copley Motion Libraries (CML) and COM Objects make system commissioning fast and simple. The development of low level code to control a CANopen network of intelligent drives is eliminated. All network management is taken care of automatically by a few simple commands linked into your application program. Even programmers with no CANopen experience can get a multi-axis application up and running quickly.

Copley supports two levels of development environments: CML and CMO. CML links into C++ application programs. For users less fluent in C++ software, CMO provides COM objects that can be used by Visual Basic, NET, Labview or any program supporting the COM interface.

CML delivers optimal flexibility and performance. The application program can run on a PC under Windows and Linux, or on embedded microprocessor with any real time multi-tasking operating system. CMO provides optimal ease of use for applications running under the Windows operating system.

System Commissioning With CME 2(TM) Software

Applying power for the first time to a system involving multiple motors is often a white knuckle undertaking. Wrong or intermittent connections can cause equipment damage or operator injury. Getting the system safely up and running is referred to as System Commissioning, and the usual trauma associated with the initial application of power is now mitigated by two powerful algorithms, both provided by Copley's proprietary CME 2(TM) setup software. System commissioning and precise amplifier-motor tuning processes are compressed from days to hours. The CME 2(TM) software eliminates the traditional time consuming wire-and-try method of fault diagnosis and correction.

"I get to sleep at night," is how system managers describe CME 2(TM) software's automated commissioning benefit.

Applying CME 2(TM) Software

Users first load CME 2(TM) system setup software into their local computer. An RS-232 connection enables the user to transmit setup commands from computer to amplifier. The link also transfers final system settings to the amplifier's nonvolatile flash memory.

Initial system setup involves entering amplifier and motor electrical data via computer keyboard and mouse. The CME 2(TM) software provides multiple panels and steers the user's step-by-step action. After entering amplifier/motor electrical data into the flash memory, the user adds motor-and-load mechanical data.

CME 2(TM)'s Auto Phasing algorithm is invoked to monitor correct polarity and phasing of all connections. Not only does Auto Phasing confirm proper connections, but it can switch wiring polarities or phases when errors are encountered. Because the Accelnet(TM) Micro servo amplifier is an all-digital design, polarity correction is accomplished by internal amplifier software reconfiguration. CME 2(TM)'s Auto Tuning algorithm automatically configures current loop parameters once auto phasing has been completed. Powerful oscilloscope tools facilitate fine tuning.

Field Oriented Motor Control Raises Speed, Power

The Accelnet(TM) servo amplifier differs radically from earlier generations because it is no longer consists mostly of electronic circuits. A very substantial portion of the amplifier's price covers Copley's investment in firmware.

The Accelnet(TM) amplifier's all digital operation choreographs sinusoidal drive current sequences for field oriented control of brushless motors. Field oriented control enables brushless servomotors to deliver optimally flat torque-speed performance without rolloff at higher speeds. Because desired motor torque can be produced by lower drive current, amplifier and motor heating are reduced and system reliability (MTBF) is enhanced. Cooler running amplifier and motor also simplify system design. A patented motor current monitoring circuit simplifies Accelnet(TM) circuit design, reduces parts count, component real state, and contributes significantly to the new amplifier's low cost.

Amplifier Specs

Accelnet(TM) Micro servo amplifiers work with a range of operating voltages and drive currents. Actual output ranges are 20 - 55V at 3A continuous to 6A peak, and 20 - 90V at 2A continuous to 4A peak.

The amplifier's carrier cancellation modulation minimizes ripple current, which occurs at twice the carrier (PWM) frequency. Ripple frequency is 28 kHz. Current loop bandwidth is 2.5 kHz. The amplifier provides 14 kHz current loop update rate (71.4 µs) and 3.5 kHz (286 µs) position and velocity loop update rate

Mechanical Specs

Accelnet(TM) Micro servo amplifiers are designed with solderless power and signal connections, and are built in PCB-mounting packages measuring 2.5 x 1.6". The amplifiers are protected against over-current, over-temperature, and incorrect operating voltages. They are further protected from short circuits between outputs, from output to ground, against over-current, over-temperature, and against incorrect operating voltages. In addition, protection circuits guard against loss of signal from either the encoder or the motor's Hall sensors. Built-in computation algorithms monitor the I2o T heating effect of load current. Based on motor self-heating information, automatic protection algorithms enable amplifiers to drive servomotors safely at their performance ceiling.


Set up is fast and simple using Copley Motion Explorer (CME 2(TM)) software operating under Windows® and communicating with Accelnet(TM) Micro amplifiers via an RS-232 link. CAN address selection is by digital inputs or may be programmed into the driver's internal flash memory.

Delivery o Contact o Price

Delivery: Stock- 4 weeks ARO.

Dean Crumlish, Ext. 266
Copley Controls Corporation
20 Dan Road, Canton, MA 02021
Tel: 781 828-8090 o Fax: 781 828-6547

Price: (1 - 9): From $298, depending on rating and quantity

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