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    What would cause a 4-20mA Loss Warning on an Altivar Process Drive?

    Issue:
    What would cause a 4-20mA Loss Warning on an Altivar Process Drive?
    How to get rid of Red Flashing Warning Light?

    Product Line:
    Altivar Process Drive (ATV630, ATV930, ATV650, ATV950, ATV660, ATV960, ATV680, ATV980)

    Environment:
    All serial numbers for Altivar Process Drive

    Cause:
    Drive is displaying Warning or Error Codes:
    AP1 - AI1 4-20 Loss Warning
    AP2 - AI2 4-20 Loss Warning
    AP3 - AI3 4-20 Loss Warning
    AP4 - AI4 4-20 Loss Warning
    AP5 - AI5 4-20 Loss Warning
    LFF1 - AI1 4-20mA loss
    LFF2 - AI2 4-20mA loss
    LFF3 - AI3 4-20mA loss
    LFF4 - AI4 4-20mA loss
    LFF5 - AI5 4-20mA loss


    Resolution:
    The 4-20mA loss operates with 2 hysteresis: one threshold to activate the 4-20mA loss and the other threshold to allow the reset of this 4-20mA.
    - When the AI value goes under 2mA the drive detects the 4-20mA loss.
    - When the AI value goes over 3mA the drive allows the reset of 4-20mA loss
    - When the AI value drops down pretty close to 2mA the drive displays a 4-20mA Loss Warning

    Possible Remedies:
    - Verify the connection on the analog inputs
    - Check mA signal for possible interference
    - This detected error can be cleared with the [Auto Fault Reset] Atr or manually with the [Fault Reset Assign] rSF parameter after the cause has disappeared

    To Clear 4-20mA Loss if getting Warning Light
    If getting a red warning light flashing on the keypad normally it is because it detects an AI2 or AI3 4-20mA Loss Warning. To clear the warning light try the following:
    • First, disable the 4-20mA warning
      • [Complete settings] [Error/Warning handling] [4-20mA loss]
    • Second, change from 4-20mA to Voltage
      • [Complete settings] [Input/Output] [AI/AQ] [AI2 configuration]
      • [Complete settings] [Input/Output] [AI/AQ] [AI3 configuration]

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