Asking for communication betwwen Micro 850 (CCW) and Danfoss FC 102 VFD ( Modbus RTU)

Hi everyone,

I would like to use Micro 850 to control DF FC 102. I adready connect Danfoss fc 102 VFD ( it can run the motor) to Micro 850 by embedded sirial port. and set the controller - Sirial port: Modbus RTU - RS485. (picture 2)

I dlready write the testing program (picture 3), and set the LocalCfg and TagetCfg ( picture 4 &5)

According to Danfoss modbus manual, i found the modbus address to read Frequency is 16129 ( picture 1) .

I already tried a lot of Modbus Addresses like 16130, 416129, 416130 ( for Frequency) and 16139, 16140, 416139, 416140 ( for current). But the value I recieved from Modbus LocalAds is always 0. ( the VFD was controlling the motor at that time, the motor was running).

I am new in CCW; therefore, I do not know what I did wrong. i watched a lot of Tim Wiborne's videos but still do not know how to solve it as well.

If anyone has the answer please let me know. I really appriciate it.

Anyone knows please help me. thank you so much

This will work 100%!

Hello friend,

I promise you this solution will work 100%. All you need to do is switch the white and black wires on your Modbus Adaptor. Therefore your problem is a polarity issue.

Cheers!

Thank you Sir. You are right 100%. Have a good day.