These two series are of different overload capacities (IHF: 150% , IPF:120%). IHF series is recommended for load requiring constant torque, and IPF series is recommended for load with starting torque less than 120%, such as fans and pumps. These two series are provided for your own options to make your system both reasonable and economic based on the loads in practice.

Sensorless control mode realize high precision constant speed control on operation from low speed to high speed
In addition to V/f control mode, the sentorless control mode which is based on the vector control theory is applied to enhance the speed control and load feedback. The motor constants automatically tuned function is in particular suitable for motors with different constants.

PID control function need no external PID controller
PID control function can be set to get constant command values even when load is changing. This enables you to apply this equipment in any field among constant pressure water supply, air flow control, temperature control, etc.

Energy saving control function a new function making your motor always running in high effeciency
Three energy saving methods can be used to gain high efficiency of your motors.
We strongly recommend you to use this function in your energy saving project of your company.

Constant pressure water supply control function need no external PID controller, PLC controller or water supply controller
You can control multiple electromagnetic contactors only by adding the option IWS base board for constant pressure water supply system. IWS is an ideal part in your cost effective constant pressure water supply system.

Scheduled and disturbed operations realizing auto running of programs
It is a main function used in textile system and can be set for different situations.

Momentary power failure conpensation function when momentary power failure occurs, keep inverters running
Keep inverters running by use of the inertia from the load side. This function is especially suitable for load like rolling machine whose rolling speed can be slowed down slightly to keep the machine running.

Flying start in reverse run check the rotating direction of a motor in free run
By checking the speed and direction of rotation, the inverter can stop the motor and restart it to specified direction smoothly.

Options
The following options are available: communication board (ISI), PG feedback board (IPG), board for constant pressure water supply (IWS), etc.