Allen Bradley PowerFlex 70, PowerFlex 700, PowerFlex 700L & PowerFlex 700S Drive
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Mar 12, 2024 5:25 am
Cause : DC Bus Undervolt comes when bus voltage has fallen below the level configured by parameter 409 [Line Undervolts].
1. Verify the AC Line.
2. In frames 1-4, verify the precharge resistor is present. (With power off, there should be a resistance between DC+ and BR+).
In frames 5 & 6, check the precharge board for errors. See the precharge board LED for fault sequence.
