Product Information

SD-Series Servo Drives

Note: The SD Drive family is fully supported and in production. For new applications, S2D-Series Servo Drives are recommended.

SD-Series Servo Drive

Up to 16 ServoWire SD drives can be interfaced to a SMLC using ServoWire protocol for motion control networking. Fourteen models offer continuous output currents from 2.5 to 60 amps RMS/phase and an all-digital design eliminates all manual drive setup including potentiometers and jumpers.

Key Features

  • IEEE 1394b ServoWire (FireWire) digital network with locking connectors
  • Drive Power Inputs of 115, 230 or 460 VAC
  • Small footprint
  • 2 Digit status display
  • Field Oriented Control (FOC)
  • Space Vector Modulation (SVPWM)
  • UL/CE marked
  • ServoWire drive network interface
  • Flexible drive I/O
  • Multiple feedback options
  • Quadrature and Serial Encoders as well as Hall feedback

ServoWire SD drives offer high performance motion control using all-digital servo drives connected via an open standard FireWire network. Two series of drives offer solutions with power from 600 to 24,000 watts, and continuous current output from 2.5 to 60 amps RMS/phase.

SD drives provide high performance servo operation using digital networking technology based on IEEE 1394b (FireWire). This network not only provides high speed, but also ease-of-use through cost-effective, industry-standard cabling. Each ServoWire drive supports a variety of high performance servo motors. Consult ORMEC for OEM applications of user-supplied brushless rotary or linear motors—as well as DC brush- type and voice-coil motors. All ServoWire drives use reliable IGBT-based intelligent power modules and provide a cost effective solution for many motion control applications.

ServoWire drives operate on DC, 115, 230 or 460 VAC input power, and provide both output short circuit and overvoltage protection. All-digital design eliminates the troublesome analog interface between PC and drive systems, replacing it with a high-speed network based on the IEEE 1394b standard.


SD drives combine all-digital operation with DSP technology to produce fast update rates, and correspondingly high performance. The high bandwidth control loops in the ServoWire SD Drives, along with high resolution motor feedback, combine for quick and accurate torque, velocity and position control. Position, velocity and torque loops are all closed in these drives. This distributed control architecture allows for high performance without placing a heavy computing burden on the SMLC.

Programmable Drive Configuration

Factory adjustments are digital, automatically calibrated and stored in Flash memory. All user configurations are done with software using axis configuration tools in ServoWire Pro. Motor types are selected from a database of ORMEC standard products or the custom motor wizard is used to read most of the necessary parameters from the motor,  simplifying non-standard motor configuration. Configuration data for each drive, including motor parameters, all operational limits for torque and speed, I/O configurations, load inertia and servo loop tuning parameters, are stored in the SMLC and can be downloaded by the application program as needed over the ServoWire network. Simple cabling accommodates up to sixteen drives per network and provides quick and reliable installation.

Standard Motor Interface

ServoWire SD drives interface to motors that use encoders or resolver feedback. The supported encoders are quadrature encoders with hall track information or serial encoders. The drives provide smooth output torque by using three-phase sinusoidal commutation.

Integrated Drive I/O

Integrating high speed I/O at the drive level gives you greater flexibility and tighter control over the interaction between motion and external sensors and actuators. External sensors can initiate motion within one servo loop update and capture position with microsecond resolution. Three optically isolated inputs, four optically isolated outputs and one bi-directional I/O point are available. These may be used as general purpose I/O or for a variety of preprogrammed functionality, including an E-Stop input, buffered encoder reference output, drive ready output, fail-safe brake output and more.

IEEE 1394b Interface (OHCI)

The SD drives implement a 1394b interface, the third generation in the evolution of this IEEE standard. This high speed network connects the drives to the controller, providing significantly more control and data than is possible with a low speed network. Data transfers run at up to 400 MBit using the isochronous channel for time critical information and asynchronous channel for other data. Compatibility to earlier 1394 versions is maintained.

Feedback Options

ServoWire SD drives can include an optional interface for an auxiliary feedback interface, making an SD drive an axis and a half unit. An optional resolver interface is available.

Safety & Maintainability

Safety interlocks are standard in all ServoWire drives. The network’s integral safety interlocks and comprehensive alarm detection provide safe operation for ServoWire drives and the SMLC or a host PC. The I/O on an SD drive can be configured to include an E-Stop input and drive ready output, which can be connected to the machine E-Stop interlock circuit. Overall system maintainability is enhanced by extensive alarm detection and reporting via the ServoWire network



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Part Numbers

The following is a list of valid part numbers for SAC-SD Series Servo Drives