The FR-A700 high performance frequency inverters from Mitsubishi Electric UK combine innovative functions and reliable technology with maximum power, economy and flexibility. The FR-A700 is particularly well suited to demanding applications like cranes and lifting gear, high-bay warehousing systems, extruders, centrifuges and winding machines.

Precision without encoders

Even without encoders the FR-A700 continuously calculates the optimum magnetic flux for every operating state. A complex motor model and the specifications of the connected standard asynchronous motor are used to improve torque constancy across an extended speed range. For example, the system can generate torque of up to 200% from a very low starting frequency of just 0.3 Hz. Known as real sensorless vector control (RSV), this Mitsubishi Electric technology can be used to regulate the torque. This makes it possible to use inverters for many applications that were previously the exclusive domain of DC or closed-loop vector drives.

Ultra-precise speed and torque

When operated with an encoder, the FR-A700 drives deliver ultra-precise speeds across the entire control range (precision ±0.01 %) and extremely fine torque control (±10 % precision and ±5 % repeatability). This outstanding performance makes it possible to switch from simple servo systems to inexpensive frequency inverter systems.

Cost effective positioning

In combination with closed-loop vector control the FR-A700 inverters can also be used for positioning, with the control being realised via pulse train, digital inputs or network.

Auto-tuning

The optimum performance achieved in encoderless vector operation depends on precise motor data. The current generation of inverters has an auto-tuning function that can obtain all the necessary specifications from the motor in less than a minute, even when the motor is not running. Users can store the data records for up to two motors.

In addition, the online auto-tuning function automatically registers and compensates changes in the data during operation such as those caused by temperature fluctuations.

Another tuning system known as easy gain tuning simplifies the optimisation of the speed control. This system monitors the motor’s speed response and automatically optimises the control parameters, eliminating the need for time-consuming manual adjustment and calibration.

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