Why is the ATV61/71 not following the 4-20mA signal wired into AI3+ on the VW3A3202 extended IO card?

FA173461

22/07/2020

Issue:
ATV61/71 wired into AI3+ on VW3A3202 and not following 4-20mA signal.

Product Line:
Altivar ATV61 and ATV71

Environment:
All ATV61 and ATV71 with VW3A3202 option board

Cause:
Analog signal not working

Resolution:
AI3-/ AI3+ is a differential current input.  You must jumper AI3- to the com terminal before wiring in your 0 to 20mA or 4 to 20mA signal.
Check ref 1 channel to see if it is programmed for AI3.
Check resistance between AI3+ and com with no power applied to the drive, you should measure 250 ohms.
Check the polarity between AI3+ and com make sure the signal is not inverted.