Mitsubishi VFD FR-A800 Plus

Mitsubishi Electric frequency inverter FR-A800 Plus series is suited for various cranes to achieve fast, robust, and smooth operations.

Anti-sway control.
By using the Mitsubishi's original anti-sway control technology, the swinging of an object moved by a crane is suppressed at the time of stopping, even without operator's input adjustment. This control cuts down the tact time and facilitates efficient operation.

Load torque high-speed frequency control (mode 2).
When there is a light-load (when light loads are moved up or down by a crane), the speed will automatically be increased. This reduces the tact time and facilitates efficient operation. The possible operation speed is set automatically according to the load. After starting the inverter, the inverter runs at high speed with a light load.
Shortest-time torque startup function.
The time from the start command to when the brake opens is shortened. This will contributes to reduction in tact time.
- Shortest-time torque startup function: The optimum distribution of the excitation current and torque current enables rapid startup of the torque.
- Magnetic flux command during pre-excitation: Decreasing the pre-excitation current during a motor stop reduces power consumption during standby, and enables rapid startup of the torque.

Approach to the leading Mitsubishi Electric drive FR-A800 Plus series performance.

High response.
The improved speed response ensures a minimal speed fluctuation to maintain a constant speed when the load fluctuates.
- Speed response Real sensorless vector control 50 Hz*1 (A700: 20 Hz) Vector control*2 130 Hz*3 (A700: 50 Hz)

High torque at low speed.
Our new inverter realizes smooth cargo handling work at low speed and high torque for the slow and stable movements required for heavy objects.
- Starting torque (at 0.3 Hz) Real sensorless vector control 200% (ND rating) Vector control*2 200% (ND rating) (150% of initial setting for 5.5K or higher).

Control the machines as you desire with Mitsubishi Electric vfd FR-A800 Plus series PLC function.

Inverter operation sequence customized for the machine.
Inverter control such as inverter operations triggered by input signals, signal output based on inverter operation status, and monitor output can be freely customized based on the machine specifications. Control programs can be created in sequence ladders using the inverter setup software (FR Configurator2) (to be supported soon).
Application example 1: Position error correction.
The traveled distance (total number of travel pulses) of each wheel is directly read from the encoder installed at the wheel. The pulses from the two wheels are then compared, and their speed is adjusted to synchronize the wheel positions. There is no need to use an external controller to offset speed, allowing high accuracy control.

Application example 2: Wire rope length measurement.
The travel axis reads the amount of lifting/lowering movement (encoder pulse) of the lift axis to calculate the wire rope length. The wire rope length according to the operating condition can be applied to the anti-sway control. The lifting/lowering speed can be slowed down when the rope length reaches a predetermined value to prevent the object from colliding into the lift axis drum, etc.

Delivering a comfortable inverter operating environment ―FR Configurator2 (to be supported soon).

Easy USB cable connection.
A USB connector (mini B connector) is provided as standard. The connection with a personal computer can be established easily without using a converter.
Remote operation.
Importing trace data or parameter settings that have been copied in a USB memory device to FR Configurator2 enables analysis or adjustment at a remote place.
Intuitive user interface.
Connected inverters are displayed in a tree view. Windows of each function can be switched using tabs, facilitating operations.

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