Low read-back volts from DC bus circuit.

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This fault indicates that a low voltage read-back is detected from the DC bus circuit. This can occur during Self-Tune (Function #997) or Self-Diagnostic (Function #998). For drives larger than 300 amps DC, this involves discrete wires.

• Missing wire connected to the bus voltage feedback circuit.
• Component problem where the feedback voltage divider ratio does not match the one identified in the Cube ID PCB.

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1. 1

   Check for any missing wires connected to the bus voltage feedback circuit.