toddp65
Member
Hi all,
Playing around with this controller for a future project.
Background: Micro 820 with 1 analog voltage output.
Discrete on/off to enable an ABB VFD and also give speed reference (0-10).
Currently when drive is enabled I goes straight to 60 hertz. The analog input and terminal is set correctly on the VFD.
In the attached you can see how the Micro 820s scaling converts the units 0-4028 to 0-10 for the drive and it should be out puting 3 volt DC--It does not.. Does this appear correct? Oddly, when you go from speed reference to ground it's 9 volts (still not 10) but 0-10 to the 24 negative you get 0. I have had issues with this controller before (stuck digital input--still on and this unit has never been in service) I'm just wondering if there's an issue with the analog out.
Also the Micro 820's output terminals have been wired correctly with 24vdc going to the strip and the neutral.
Playing around with this controller for a future project.
Background: Micro 820 with 1 analog voltage output.
Discrete on/off to enable an ABB VFD and also give speed reference (0-10).
Currently when drive is enabled I goes straight to 60 hertz. The analog input and terminal is set correctly on the VFD.
In the attached you can see how the Micro 820s scaling converts the units 0-4028 to 0-10 for the drive and it should be out puting 3 volt DC--It does not.. Does this appear correct? Oddly, when you go from speed reference to ground it's 9 volts (still not 10) but 0-10 to the 24 negative you get 0. I have had issues with this controller before (stuck digital input--still on and this unit has never been in service) I'm just wondering if there's an issue with the analog out.
Also the Micro 820's output terminals have been wired correctly with 24vdc going to the strip and the neutral.
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