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    How do I troubleshoot the Altivar Process Drive when it will not connect or communicate while over a Modbus Serial Network?

    How do I troubleshoot the Modbus Serial on the Altivar Process Drive?

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

    All serial numbers for Altivar Process Drive



    Note: This FAQ goes over some basic checks and troubleshooting tips. For extended troubleshooting please refer to your drives Modbus Serial manual. 

    Drive Will Not Connect
    • Installation
      • Make sure Modbus cable (not Ethernet cable) is connected to the appropriate Modbus serial port.
      • Pin Layout - Make sure to use proper pinouts
      • Isolate any electrical interference
        • Use conduits
        • Separate control and power connections
      • Add terminating resistors if the drive is at the end or the last of device in the network.
      • Network
        • Check for any duplicate addresses on the network.
        • Check to make sure you have proper configured assemblies
      • Programming
        • Check Basic Settings on the drive. Make sure the following is set:
          • Modbus Address
          • Modbus Baud Rate
          • Make sure drive is power cycled after any Communication settings are made.
      • Troubleshooting
        • Check LEDs on the drive
        • The following figure describes the LEDs status for Modbus Field-bus monitoring:
        • Eth NS (Embeded Modbus) - Indicates the Modbus serial link connection status​
    Drive Connects But Will Not Run
    • Network
    • Programming on the Drive
      • Confirm drive is setup for Network Control
        • Check Command and Reference Menu
          • [Complete settings] [Command and Reference]
    • ​​Troubleshooting
      • Check Communication Map
        • [Display] [Communication map]
          • ​​Check Command Channel
          • Command Register
          • Ref Freq Channel
          • Ref Freq
    • Reference attached manuals for further troubleshooting 

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