The advanced optimum excitation control (AOEC) in Mitsubishi Electric’s FR-F800 series inverter drives continuously adjusts the excitation current to an optimum level providing highest motor efficiency. The newly developed AOEC, provides a large starting torque while maintaining the motor efficiency throughout the speed range.

This is done without the troublesome adjustment of acceleration/ deceleration time, and torque boost. By using the drive’s intelligent functions, like Advanced Optimum Excitation Control and the enhanced PID controller, the F800 offers commercial and industrial users a proven way to significantly reduce the high motor running costs associated with pump and fan applications.

Detection of mechanical faults

With the load characteristics measurement function, five speed-torque values of the load can be detected and stored automatically. By comparing the present speed/load status with the stores speed/ load characteristics, out-of-range warnings can be accurately measured and quickly acted upon, meaning unnecessary alarms/line stops can be avoided. The F800’s advanced algorithm means mechanical faults such as pump blockage/ dirty impeller or broken belt are promptly detected and identified.

Cleaning of fans and pumps

Foreign matter on the impellers of fans or pumps can be removed by repeating forward/reverse rotation and stopping of the motor. This is avoiding expensive removal of the system. This function can be also automatically started when the result of load characteristics measurement is out of range.

Advanced PID control functions

The F800 can perform PID control of the motor operation and control the external equipment at the same time. During PID control the drive will activate “sleep mode” to avoid energy loss, when deviation is small and output speed is low. As soon deviation becomes bigger again the drive will start up immediately. The drive’s integrated PLC function can be enhanced using a plug-and-play HMI

Other HVAC functions include:

–  One drive can control multi pumps

– Second PID controller

– Direct access to PID set-point by Display

– Pump Stir function

– PID output hold (incl. multi pump)

– PID upper/lower limit pre-warning

– Pipe burst detection / Dry run protection

– Digitally selectable PID set points

– Pipe soft fill to prevent water hammer

– PID pre-charge function

– Pre-sleep boost function

– Water Hammer avoidance at stop

– Automatic PID gain tuning

Easy setup and operation

Users can comfortably setup the drives with the Setup-Software FR Configurator2, by direct connection via USB port. Easy start-up of several drives can also be managed by down/up loaded directly via USB stick. A choice of local operator panel allows direct access to all important parameters including direct setting of the PID set point

Fast resolution of problems

Clock setting is available in addition to the cumulative energization time. The time and date at a protective function activation are easily identified. The date and time are also saved with the trace data, which makes the fault analysis easier. The F800 includes the ability to record or capture 8 of 72 device values. This recording can be triggered automatically, meaning intermittent errors are easily investigated. These errors can be time stamped by the real-time clock

Mitsubishi offers a three year fit and forget“ warranty through 999 Inverters.