text: <s>[INST] PF400 - F3 Power Loss I am currently using a PowerFlex 400 VFD (part number: 22C-D038A103 – 480VAC, 25HP). I am sometimes receiving Fault Code F3, Power Loss (DC bus voltage remained below 85% of nominal). Since the action specifies to “monitor the incoming AC line for low voltage or line power interruption” is there any documentation that quantifies low voltage? [/INST] Here from the User Manual - page A-3 F3 - Power Loss - FRN 5.03 and earlier only:The DC bus voltage fell below undervoltage level within 200 ms of a start command, DC bus ripple voltage is excessive, or an input phase loss has been detected. Power Loss Fault (F3) occurs if an undervoltage condition is present on drive power up, or if there is excessive DC bus ripple (for example a missing input phase) whilst the drive is running. - fuzzy logic \\n </s>