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    10 Tips for Using Servo Drive

    Safety precautions are essential when working with servo drives to ensure the well-being of personnel and the proper functioning of equipment. Here are some general safety precautions to consider. Here are 10 tips for using a servo drive.

    Servo Motor Insulation Test

    Perform the insulation test when the servo motor is used for the first time, reused after being stored for a long time, or in a regular checkup, in order to prevent poor insulation of servo motor windings from damaging the servo drive. The servo motor must be disconnected from the servo drive during the insulation test. A 500-V mega-Ohm meter is recommended for the test. Ensure that the insulation resistance is not less than 5 MΩ.

    Input terminals of servo motor

    Thermal Protection of Motor

    If the rated capacity of the motor selected does not match that of the servo drive, especially when the rated power of the servo drive is greater than that of the motor, adjust the motor protection parameters on the operation panel of the servo drive or install a thermal relay for the motor for protection.

    Use Outside the Rated Voltage

    The servo drive must not be used outside the allowable voltage range specified in this manual. Otherwise, components inside the servo drive may be damaged. If required, use a corresponding voltage step-up or step-down device. Do not change the three-phase input of the servo drive into a two-phase input because this will cause faults or damage to the servo drive.

    Surge Suppressor

    The servo drive has a built-in varistor for suppressing the surge voltage generated when the inductive loads (electromagnetic contactor, electromagnetic relay, solenoid valve, electromagnetic coil and electromagnetic brake) around the servo drive are switched on or off. If the inductive loads generate a very high surge voltage, use a surge suppressor for the inductive load or use a surge suppressor together with a diode. Do not connect the surge suppressor on the output side of the servo drive.

    Motor Heat and Noise

    The output of the servo drive is pulse width modulation (PWM) wave with certain harmonics, and therefore, the temperature rise, noise, and vibration are slightly greater than those at running with the mains frequency.

    Output terminals of servo drive

    Voltage Sensitive Device or Capacitor on the Output Side of the Servo Drive

    The output of the AC drive is the PWM wave. Do not install the capacitor for improving power factor or lightning protection voltage-sensitive resistor on the output side of AC drive. Otherwise, the AC drive may suffer transient overcurrent or even be damaged.

    Special Usage

    If wiring that is not described in the manual such as a common DC bus is applied, contact the agent or Inovance for technical support.

    Altitude and Derating

    In places where the altitude is above 1000 m, the cooling effect reduces due to thin air, and it is necessary to de-rate the servo drive. Contact the agent or Inovance for technical support.

    Adaptable motor

    The standard adaptable motor is a permanent synchronous servo motor. The standard parameters of the adaptable motor have been configured inside the servo drive. It is still necessary to perform motor auto-tuning or modify the default values based on actual conditions. Otherwise, the running effect and protection performance will be affected. The servo drive may alarm or even be damaged when a short circuit exists on cables or inside the motor. Therefore, perform the insulation short-circuit test when the motor and cables are newly installed or during routine maintenance. During the test, make sure that the servo drive is completely disconnected from the testing parts.


    The electrolytic capacitors on the main circuits and PCB may explode when they are burnt. Poisonous gas is generated when the plastic parts are burnt. Treat them as ordinary industrial waste.

    Always consult the manufacturer's documentation and guidelines specific to the servo drive model you are working with, as requirements may vary. Additionally, adhere to local safety regulations and standards applicable in your region. ATO provides the best servo drive and servo motors to choose from, for more information about them, please go to the servo motors shopping page.

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