Servo drive technology, as one of the key technologies for CNC machine tools, industrial robots, and industrial automation, has received widespread attention both domestically and internationally. The development of microprocessor technology, power electronics technology, network technology, and control technology has laid a solid foundation for the further development of servo drive technology. If the 1990s were the decade in which servo drive systems achieved full digitalization, intelligence, and networking, then with the Industry 4.0 concept proposed by Germany, industrial automation in the Industry 4.0 era will shift from centralized control to a decentralized, enhanced control model within the existing automation technologies and architectures. This will allow for seamless communication between devices, from sensors to the Internet, thereby establishing a highly flexible, personalized, and digital production model. In this model, production automation technology can make equipment more intelligent through self-diagnosis, self-correction, and various functional software, better assisting workers in completing production tasks.
Servo drives, also known as servo controllers or servo amplifiers, are a crucial component of industrial automation. They are controllers used to control servo motors and are part of a servo system, primarily used in high-precision positioning systems. They typically control the servo motor through position, speed, and torque to achieve high-precision positioning of the transmission system, which in turn can control robots, thus enabling industrial automation.
Servo drives require power supply lines and motor encoder lines to control motor operation. Specifically, this includes a DC 24V power supply line, position control signal lines, speed control signal lines, torque control signal lines, and other input/output control lines. The servo drive's DC 24V power supply needs protection against overcurrent and short circuits in the downstream load. TE's PolySwitch provides recoverable overcurrent protection; when the fault is cleared, simply disconnecting the power will reset the PolySwitch, avoiding the need for repairs like with one-time fuses that disconnect after an overcurrent event. For the various output signal lines of the servo drive, due to the harsh wiring environment and heavy workload in industrial settings, wiring errors are inevitable. Often, power-limited I/O ports are mistakenly short-circuited, causing overcurrent burnout. Therefore, it is essential to design overcurrent protection measures for each output port of the servo drive, placing self-resetting fuses or PolySwitch at each output port to prevent accidental short circuits. In this way, if the commissioning personnel accidentally connect the output port incorrectly or short-circuit it on-site, the PolySwitch resettable fuse will immediately activate to protect the servo drive's I/O board by limiting the operating current of the output port. Once the fault is cleared, the PPTC resettable fuse will quickly and automatically return to a low resistance state, and the servo drive can resume normal operation.
The servo controller can easily switch between operating modules and fieldbus modules via an automation interface, and different control modes can be achieved using different fieldbus modules, namely RS232 and RS485. RS232 and RS485 buses also require protection. For buses that need to be routed outdoors, lightning protection must be designed. TE Circuit Protection Department has a complete set of solutions for different lightning protection levels. For relatively high-level lightning strikes, a two-pole protection scheme can be used; PPTC can provide coupling and overcurrent protection functions. For RS232 and RS485 buses that do not need to be routed outdoors, PPTC can provide effective overcurrent protection.
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