SOC Level Lost

What does F91 mean?

This Automatic Fault occurs when the gateway device is not receiving State of Charge (SOC) data from the external BMS or Battery Monitor. This prevents the XW Pro from displaying or utilizing accurate battery charge information.

• Communication loss between the external BMS/Battery Monitor and the gateway device (e.g., CAN bus cable fault, RS485 wiring issue).
• External BMS/Battery Monitor device has malfunctioned or stopped transmitting State of Charge (SOC) data.
• Gateway device configuration error preventing it from requesting or interpreting SOC data (e.g., incorrect device address, protocol mismatch).
• BMS or Battery Monitor itself has an internal fault preventing accurate SOC calculation or transmission.
• Software or firmware incompatibility between the external BMS/Monitor and the gateway device.

Click steps to track your progress.

1. 1

   1. Verify that the external Battery Management System (BMS) or Battery Monitor is powered on and functioning correctly (e.g., its display shows SOC).

2. 2

   2. Inspect the communication cable (e.g., CAN bus, RS485) between the external BMS/Monitor and the gateway for physical integrity and proper termination.

3. 3

   3. Access the gateway device's configuration interface and confirm that the correct external BMS/Monitor device is selected and its communication parameters (e.g., address) are set correctly.

4. 4

   4. Power cycle the external BMS/Monitor and the gateway device in sequence to reset communication modules.

5. 5

   5. Check for any firmware updates for the gateway or external BMS/Monitor that specifically address communication stability issues.