Prostar have different series of frequency inverter(AC DRIVES), like PR-6000,PR-7500,PR-8000 and more... PR-6000 series inverter arewith V/F control,LED display ,Inbuilt PI controller etc,Also PR-6000 frequency inverter is with inbuilt PLC process control for automatic multispeed function,which can reduces extra cost of PLC and other wiring logic,timer and relays also reduces complication of wiring in applications,mostly suitable for air compressor,air blower,water pump for close loop control for energy saving purpose, also suitable in automatic step speed process control applications.