The Sinamics G120 series of inverters from Siemens Automation and Drives (A&D) is being expanded with a distributed version with degree of protection IP65 for cabinet-less installation. The inverter allows the speed of three-phase induction motors to be continuously controlled and fulfils all of the requirements for conveyor system applications - from basic open-loop frequency control up to sophisticated vector control.
The Sinamics G120 series of inverters from Siemens suits automotive conveyor applications
The series has a compact design and, thanks to its flat shape, is easy to mount even in very narrow places. The uniform footprint for all power outputs allows simple replacement and expansion. The power output range of 0,75 to 7,5 kW covers most conveyor applications. The drive can be integrated into the Siemens TIA automation environment via Profibus. The integrated safety functions, which include safety torque off, safe stop 1 and safely limited speed, provide encoderless protection for people and machines. The functions are activated and deactivated by means of the ProfiSafe protocol.
Thanks to an innovative power-infeed concept, the Sinamics G120D needs only around 80% of the power of comparable frequency inverters. Due to this reduction of the input current by a fifth, less reactive power is needed as well. This helps to reduce the costs of electricity and, at the same time, enables installations to be designed for lower power levels. A line commutating reactor, brake chopper and brake resistor are no longer necessary. The inverter also returns energy to the power supply system during braking with considerable less line harmonic distortion than in the case of standard frequency inverters. There are no additional heat losses.
Commissioning, diagnostics and maintenance are simplified by plug-in connectors and large illuminated displays. Due to the modular design, modules can be replaced easily. This ensures a high level of availability because the power section can be replaced without disconnecting the wiring or fieldbus connection.
The metal housing and IP65 protection make the frequency inverter suitable for harsh environments. On the inside, painted electronic modules and convection cooling ensure reliable operation and a long life. The Micro Memory Card for simple data storage enables rapid cloning and replacement.
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