A800 inverter’s PLC simplifies decentralised control
A800 inverter’s PLC simplifies decentralised control.
In the same way that HMIs have evolved to integrate a level of PLC functionality to simplify control applications, there has been a more dramatic development in the use of PLCs in variable speed inverter drives. The recently launched Mitsubishi Electric FR-A800 has taken this a step further.
The recently launched high performance FR-A800 offers unparalleled drive precision, speed control, simple start-up, and versatility. Integrated into the drive is an equally high performance Mitsubishi PLC processor that provides safe and accurate control performance in a diverse range of applications. It uses Mitsubishi’s easy to program PLC software to provide users with a control sequence best suited for the machine specifications.
The PLC enables a set of operations (operation at different signal inputs, signal and monitor outputs at different inverter status, etc.) to be can be freely programmed in accordance with the machine specifications. For example, a shutter opening/closing can be performed based on a signal from a sensor, or based on the opening/closing times.
PLC simplifies decentralised control.
The control of the whole system is decentralised to inverters that manage their subordinating devices individually. A group of dedicated sequence programs is created and saved in each inverter, and the master controller no longer has to process all the sequence programs. If required, an entire machine can be controlled by the inverter drive alone.
Local PLC control offers other benefits:
Up to 50 parameters, which are linked with the data registers, can be saved. The variables (data registers) used in the PLC function can be saved as inverter parameters and stored in the inverter’s EEPROM. Calculations from the PLC function are saved in the parameters, and the data can be retained when the power is removed.
USER INITIATED FAULT
Inverter output can be shut off under conditions other than those of the existing protective functions. Up to five specific fault-initiating conditions can be set to activate a protective function and shut off the inverter output.
INVERTER PARAMETER READ/WRITE
Parameter settings can be changed using sequence programs. The acceleration/deceleration patterns can also be set with sequence programs to be changed at certain operation statuses. You can choose RAM or EEPROM to save the parameter settings. When the settings are changed frequently, choose RAM.
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