AC/DC Servo Drive Repair

Servo Drive

      A servo drive is generic name for a large variety of electronic devices used for controlling the appropriate operation of a servo-mechanism. Further expanding the definition, the servo-mechanism is also a generic term for any kind of motorized assembly which implements sensors for generating feedback signals used for continuous adjustments of the mechanism movement to match a predefined behavior. Usually this behavior is represented by a desired velocity, but it can be also torque value or position.

      A servo drive use the information provided by the servo motor assembly sensors to compare the actual and desired motor status to adjust the working parameters of the motor (adjusting the voltage, the frequency, the pulse width, etc) to correct these deviations.

      Most of the servo mechanism require a specific driver for their proper operation (especially the ones designed for specific tasks), but there are also generic drivers which can control a wide variety of less demanding applications.

      There are a wide variety of servo drives, depending on:

  • the type of motor used in the servo-mechanism, which can be DC or AC (single or three phases);
  • the power of the motor which may vary from watts to megawatts;
  • the desired controlled value: velocity, torque, position, etc;
  • accuracy and feedback response speed of the drive which can lead to some very complex and intense calculations, requiring powerful computation power.

      Since most of the servo drives are used for automation processes, their connectivity should also comply with industry standards. So the following interfaces are usually implemented:

  • RS 232/422/485
  • CANOpen
  • POWERLINK
  • Ethernet/IP
  • EtherCAT
  • PROFINET
  • PROFiBUS

      Industrial applications of servo drives are numerous:

  • CNC machines;
  • Conveyors;
  • Robotics;
  • Factory automation, etc.

      Due to their complex electronic modules needed for feedback, the troubleshooting and repair process of sophisticated Servo Drives can be very difficult, often requiring specific laboratory equipment and highly trained and experienced operators.

      Since the normal operation of a servo drive it’s a mix of electronic (drive) and mechanical (motor and encoder) parts, also during the troubleshooting both of them should be checked. For the mechanical parts the operator should check the integrity of the motor shaft (not to be bend, damage or even broken) and the smooth operation of the motor bearings. Also the encoder should be checked together with the connections between the motor, encoder and the drive.

      Our team of highly qualified technicians can perform professional servo drive repair. We have the experience required, and also the test equipment needed to find the problem of any Servo Drive unit, regardless of its complexity. After the fault is found we will provide you an estimation of the repair cost, leaving you to decide if the repair will be done. Usually the repair cost is less than 50% of the price of a new unit.

      After the approval, we will repair the servo drive and test it to assure the customer that the unit will comply with all the manufacturer specified characteristics. We will guarantee our repair with up to a full year warranty.

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