PwrBd PwrDn Chks

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This internal data error specifically relates to the power board's power-down checksum, suggesting corruption in the power board's stored state or parameter data used during power cycles. This impacts safe power cycling and could lead to incorrect operation of the power section upon restart.

• Internal non-volatile memory corruption on the power board due to voltage spikes or brownouts.
• Component aging on the power board affecting data retention or integrity during power cycles.
• Firmware discrepancy or corruption within the power board's embedded controller.
• Intermittent power supply issues to the power board's control circuits or internal bus.

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1. 1

   1. Verify stable input power to the drive, checking L1, L2, L3 voltages (e.g., 480VAC) and ensuring no phase imbalance >2%.

2. 2

   2. Perform a complete drive power cycle by disconnecting input power for at least 60 seconds at the main breaker.

3. 3

   3. Check for any loose internal connections, particularly ribbon cables, between the control board and power board.

4. 4

   4. If the fault recurs, replace the power board or the entire drive, as this indicates a hardware issue with the power board's internal memory or controller.