How do you configure a Freewheel Stop (NST) on an ATV6000 Medium Voltage drive using Ethernet?

You can configure the Freewheel Stop (NST) function on the ATV6000 Medium Voltage (MV) drive using the embedded Ethernet (TCP/IP) communication by assigning a control bit in the command (CMD) word.

Configuration Steps

1. Assign a CMD Bit for Freewheel Stop

   • The CMD word includes unused bits (Bit 11 to Bit 15) that can be assigned to specific functions.
   • Assign one of these bits (for example, Bit 15) to the Freewheel Stop function (parameter C515).

2. Define the Freewheel Stop Logic

   • When Bit 15 = 0, the drive triggers a Freewheel Stop (NST).
   • This applies in both CiA 402 drive communication state and I/O profile mode.

3. Understand the Active-Low Behavior

   • The Freewheel Stop input is active-low:
     • 1 (ON) → Normal operation with ramp stop (as configured in the STT parameter)
     • 0 (OFF) → Drive performs a Freewheel Stop (motor coasts to stop)

4. Verify Operation

   • Ensure the assigned bit is correctly mapped and controlled via Ethernet commands.
   • Test both states (1 and 0) to confirm proper stopping behavior.