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

Issue:
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)


Resolution:

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
    • See FAQ FA315321
  • 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
  • Verify you can read from the drive
  • Verify reading and write to correct Modbus registers
    • Altivar 600 Communication Registers
    • Altivar 900 Communication Registers
• 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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