What is it?

This controller was designed to control an A.C 240V/315/415 motor which is driven with a 3 wire V.F.D.

A variable frequency drive is used to drive the A.C motors which uses a IGBT power Module controlled via an RS485 BUS.

Why did you make it?

I needed to control my HVAC system, mostly to make it more energy efficient. By using the controller, the motor runs according to the needed frequency 20Hz to 120Hz . Currently the board is configured to measure the temperature probe and by using P.I.D an corresponding output frequency drives the motor. Other setups or custom configuration can be done just by coding it .

What makes it special?

The controller uses an avr AT-MEGA2560 with ample i/o lines to control all the interfaces. The board consists of the following:

• Onboard atMega2560 + 16u2 serial port
• RS485 Interface wired to serial port 1
• Step down psu accepting 40V input to 12v 3 Amps
• Port for External Power
• Accepts 3 types of LCD - oled 0.96" , Nokia 5110 , 128 X 128 tft lcd
• Rotary encoder for selecting options in menu and push button
• 2 channel NTC Temperature ports
• 4 DIP switch for options - Mode - EU/USA - C/F - TIMER
• Control enable input - opto coupler isolated
• Alarm output - opto coupler isolated
• VFD PORT- UTP 8 PIN -use only to connect to VFD'S

What you get~:

Supplied as Ready built unit. Software can be customised for other functions. Please contact me if other features to be implemented.