Parameter Settings After New Firmware Upgrade Tips

With increasing adoption of VESC Tool 6.00 and newer firmware versions, many customers have reported issues with 75-series ESCs failing to operate under the new firmware. Common problems include ABS alarms after auto-tuning or abnormal flux linkage measurements (negative or zero values) after parameter settings. This blog will provide some solution for these problem.The following is FYI.

1. ABS Overcurrent Alarm

Cause:

After auto-setting with VESC 6.00 or higher firmware, the Absolute Maximum Current value is automatically reduced to a lower level. Full-throttle operation (especially in sensorless mode) can trigger ABS alarms due to insufficient current limits. Even in HALL mode, low Absolute Maximum Current settings may still cause alarms.

Solution:

Manually adjust the Absolute Maximum Current after auto-setting. Recommended ranges: 
• 75100 Aluminum Board: 150A~250A
• 75200 Aluminum Board: 250A~400A 
• 75300 Water-Cooled / 75350 Aluminum Board: 500A~700A

Notes:

a.) ABS alarms may also occur in V4/V6 series ESCs. Set Absolute Maximum Current above 150A.
b.) For more than 2WD, ensure slave ESCs are also adjusted.

2. Negative or Zero Flux Linkage Measurement

Figure 1 (Phase Filters Enabled): All parameters abnormal.

Figure 2 (Phase Filters Disabled): Flux linkage = -16.11 mMb (negative).

Figure 3 (Phase Filters Disabled): Flux linkage = 0.00 mMb (zero).

2.1 Example Detection Results:

Through multiple tests, it was found that after updating the firmware, if Enable Phase Filters is not set to False during the first parameter tuning, parameters such as inductance resistance, and flux linkage will show abnormal values, as shown in Figure 1. Subsequent setting with phase filters disabled may fix inductance/resistance but result in negative/zero flux linkage (Figures 2–3).

2.2 Solution:

Firstly, reset parameters to defaults or reflash the firmware (equivalent to resetting).And then, set Enable Phase Filters to False before auto-setting, Following this procedure the parameters will no longer result in negative or zero flux linkage.

2.3 Steps:

In VESC Tool, disable Enable Phase Filters as shown in Figure 4.

Figure 4. “Enable Phase Filters“ set to “False”

During auto-setting, select NO when prompted to load default parameters as shown in Figure 5. And then select the correct motor type and battery settings manually.

Figure 5. “Load Default Parameters select “ NO”

2.4 Result After Reflashing and Disabling Phase Filters:

Figure 6 shows a successful auto-setting result with normal flux linkage (4.70 mMo) after reflashing the firmware and disabling phase filters.

Figure 6. Result after reflashing and modifying phase filters to false

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