What Does nSt Mean on an Altivar Process Drive Display?

1. Check the Freewheel Stop Assignment

   • Navigate to:
     [Complete Settings] → [Generic Functions] → [Stop Configuration] → [Freewheel Stop Assignment]
   • If a digital input is assigned to Freewheel Stop, verify that the input state is not active.

2. Verify HMI STOP Key Operation

   • If the run command is provided through terminal inputs, pressing the STOP key on the HMI can trigger the nSt status.
   • Cycle power to the drive to clear the condition.

3. Check for a Run Command at Startup

   • If a run command is present when power is applied and [2-Wire Type] (tCt) is not set to LEL (Level), the drive may enter the nSt state.
   • Verify the setting under:
     [Complete Settings] → [Command and Reference] → [2-Wire Type]

4. Review Network Control Configuration

   • If the drive is controlled over a network and [CHCF] (Control Mode) is set to Separate or Not Separate, nSt may remain displayed until a valid run command is received.
   • Send the following command sequence to the CMD word:
     • 6 = Enable
     • 7 = Stop
     • 15 = Run
     • Alternate between 15 and 7 to start and stop the drive.
   • If the drive is controlled over a network and [CHCF] (Control Mode) is set to IO Mode.
     • Verify parameter TCC [2/3-Wire Control] is set to 3-wire or 2-wire.
     • If it is set to 3-wire, send the following decimal values:  0 to stop (1 pulse), 1 to enable, 3 to run.
     • Try to set it to 2-wire and send the following decimal values: 0 to stop and 1 to run.

5. Verify the 24 VDC Supply

   • Measure voltage between 24V and COM terminals.
   • Confirm that approximately 24 VDC is present.

6. Check the 4–20 mA Loss Response

   • Review the loss-of-signal configuration and confirm it is not set to Freewheel Stop.

7. Check the External Error Response

   • Navigate to:
     [Complete Settings] → [Error/Warning Handling] → [External Error]
   • Verify that the response is not configured as Freewheel Stop.

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