Programming and wiring logic inputs in SINK mode on Altivar 312 or Altivar 31 (ATV312/ATV31) Variable Frequency Drives (VFD).
ATV31 and ATV312
Developing control scheme
The VFD is in sink mode when the control board DIP switch is in the SINK position.
Internally, the sinking mode connects the logic inputs to the +24V as the common. A logic input is turned on by connecting it to the COM by means of a dry contact.
Note: When the logic inputs are configured for sink logic, grounding an input signal can result in unintended activation of drive controller functions.