The 0-10v analog input is not stable on Altivar 12.
Altvar 12, Altivar 312, Altivar 61, Altivar 71
All models, all serial numbers. This affect is normally experienced when using the voltage type analog input.
These drives have floating power supplies. Therefore, instability of the signal can occur if conducted or radiated noise is coupled to the wires connected to the analog input.
One resolution for all of these drives is to connect the common terminal (COM) to chassis ground. For ATV61 and ATV71 drives if connecting the common to chassis ground does not eliminate the problem set the AI1 filter (AIIF) parameter. This setting can be adjusted between 0 and 10 seconds.