Sinano Ac Servo Drive
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A servo drive is a device that provides proportionate control for electromechanically controlled motors and actuators with the ability to provide positioning and velocity data back to the servo drive. They are used in applications from model airplanes to industrial applications that support motors of hundreds of horsepower ratings. Servo drives have become popular in the control of energy consumption and are often used as conservation devices when controlling the output or velocity of motors used in many industries. There are two basic versions of servo drives: analog, which was the early version, and digital, which is the current version.
The testing tools and meters needed to troubleshoot a servo drive are more complex than the typical meters found at the retail level and usually come from industrial tool supply sources.
This is a very complex process, and readers must know how an electromechanically controlled motor, an actuator and a volt ohm meter work before attempting to troubleshoot a servo drive.
Use a volt ohm meter to determine if there is power to the servo drive at its disconnect. Test the circuit protection to make sure the voltage potential is within the specifications of the drive. The source voltage will likely range from 210 volts to 480 volts, depending on the manufacturer's drive specifications. Look in the current manufacturer’s service guide to determine if the readings are what they should be for the configuration and application of the drive. In general the drive will take the AC input voltage and potential and convert it to a manageable voltage range that may be DC or AC, depending on the design and intent of the load being controlled. The motor or device receiving the output values is designed to provide feedback data to the servo drive module so the servo drive can control the load within a specific set of parameters.
Find the output terminals on the module itself from the servo drive manual for the specific model and type of drive you are using. Check the manual for the correct scale and range to set the meter that will be used for testing the output values. Follow the manual's directions for attaching the leads to the module — misapplied leads could damage the servo drive and result in system failure.
Connect the meter leads and follow the manufacturer's directions closely. Set up the controls for the servo drive to a value that can be determined by the test gear. Read the output value and compare the reading with the graphs and charts provided by the manufacturer.
Follow the procedures given in the manual through the full range of the device and log output data for future use. Maintain a log of the testing results to be used in later tests. The output values will be variable to regulate the motor or device it is controlling. Check the manual to see if the output values are within the desired range for operation.
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A servo drive is a special electronic amplifier used to power electric servomechanisms.
A servo drive monitors the feedback signal from the servomechanism and continually adjusts for deviation from expected behavior.
Function[edit]
A servo drive receives a command signal from a control system, amplifies the signal, and transmits electric current to a servo motor in order to produce motion proportional to the command signal. Typically, the command signal represents a desired velocity, but can also represent a desired torque or position. A sensor attached to the servo motor reports the motor's actual status back to the servo drive. The servo drive then compares the actual motor status with the commanded motor status. It then alters the voltage, frequency or pulse width to the motor so as to correct for any deviation from the commanded status.[1]
In a properly configured control system, the servo motor rotates at a velocity that very closely approximates the velocity signal being received by the servo drive from the control system. Several parameters, such as stiffness (also known as proportional gain), damping (also known as derivative gain), and feedback gain, can be adjusted to achieve this desired performance. The process of adjusting these parameters is called performance tuning.
Although many servo motors require a drive specific to that particular motor brand or model, many drives are now available that are compatible with a wide variety of motors.
Digital and Analog[edit]
Most servo drives used in industry are digital or analog. Digital drives differ from analog drives by having a microprocessor, or computer, which analyses incoming signals while controlling the mechanism. The microprocessor receives a pulse stream from an encoder which can determine parameters such as velocity. Varying the pulse, or blip, allows the mechanism to adjust speed essentially creating a speed controller effect. The repetitive tasks performed by a processor allows a digital drive to be quickly self-adjusting. In cases where mechanisms must adapt to many conditions, this can be convenient because a digital drive can adjust quickly with little effort. A drawback to digital drives is the large amount of energy that is consumed. However, many digital drives install capacity batteries to monitor battery life. The overall feedback system for a digital servo drive is like an analog, except that a microprocessor uses algorithms to predict system conditions.
Analog drives control velocity through various electrical inputs usually ±10 volts. Often adjusted with potentiometers, analog drives have plug in “personality cards” which are preadjusted to specific conditions. Most analog drives work by using a tach generator to measure incoming signals and produce a resulting torque demand. These torque demands request current in the mechanism depending on the feedback loop. This amplifier is referred as a four-quadrant drive because can accelerate, decelerate and brake in either rotating direction. Traditional analog drives consume less energy than digital drives and can offer very high performance in certain cases. When conditions are met, analog drives offer consistency with minimal “jitter” at standstills. Some analog servo drives do not need a torque amplifier and rely on velocity amplifiers for situation where speed is more important.[2][3]
Use in industry[edit]
Servo systems can be used in CNC machining, factory automation, and robotics, among other uses. Their main advantage over traditional DC or AC motors is the addition of motor feedback. This feedback can be used to detect unwanted motion, or to ensure the accuracy of the commanded motion. The feedback is generally provided by an encoder of some sort. Servos, in constant speed changing use, have a better life cycle than typical AC wound motors. Servo motors can also act as a brake by shunting off generated electricity from the motor itself.
See also[edit]
References[edit]
- ^Servo drive manual
- ^'Drive Technologies'(PDF).
- ^RcHelpDotCom (2011-05-02), Analog vs Digital Servos, What's The Difference, retrieved 2019-02-14