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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?

Published date: 05 June 2019

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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