Hi everybody,

This information refers to a drive system that has a fault indication feature and provides steps to clear the faults either manually or automatically. If a fault occurs, the user can acknowledge it by pressing the Escape key and view the most recent fault information using d007. The cause of the fault must be corrected before it can be cleared. There are several methods to clear a Type 1 fault and restart the drive including setting A092 and A093 to non-zero values. To clear an OverVoltage, UnderVoltage or Heatsink OvrTmp fault without restarting the drive, set A092 to a non-zero value and A093 to zero.

F71 Net Loss The communication network has faulted.
The error message you provided seems to be indicating a fault in the communication network. To troubleshoot the issue, the recommended steps are:

- Cycle the power (turn off and then turn on the device)
- Check the communications cabling for any damages or loose connections.
- Verify the network adapter settings to ensure they are properly configured.
- Check the status of the external network to determine if it is causing the issue.

These steps should help resolve the issue with the communication network. If the problem persists, consider seeking further technical assistance.

F81 Comm Loss ➁ RS485 (DSI) port stopped communicating.

The error message you provided seems to indicate a communication loss on the RS485 (DSI) port. To troubleshoot the issue, the recommended steps are:
- If the adapter was not intentionally disconnected, check the wiring to the port and replace any damaged or loose connections, port expander, adapters or the complete drive if necessary.
- Verify the connection to the port.
- If the adapter was intentionally disconnected, the issue may have been resolved.
- Use the A105 [Comm Loss Action] to turn off the device.

These steps should help resolve the issue with the communication loss on the RS485 (DSI) port. If the problem persists, consider seeking further technical assistance.
 
F100 Parameter Checksum
The error message you provided seems to indicate a problem with the parameter checksum. The checksum read from the board does not match the checksum calculated. To resolve the issue, set the value of P041 [Reset To Defaults] to option 1

"Reset Defaults".

This should reset the device to its default settings and resolve the issue with the checksum mismatch. If the problem persists, consider seeking further technical assistance.

F122 I/O Board Fail ➁ Failure has been detected in the drive control and I/O section.
.

The error message you provided seems to indicate a failure in the drive control and I/O section of a device. To troubleshoot the issue, the recommended steps are:

- Cycle the power (turn off and then turn on the device)
- If the error cannot be cleared, replace the drive.

These steps should help resolve the issue with the drive control and I/O section. If the problem persists, consider seeking further technical assistance.

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- PowerFlex 4 User manuals

- PowerFlex 4 fault codes 

- PowerFlex 4 fault codes 2

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