text: <s>[INST] AB 1305 VFD Upgrade Recommendations Summary: AB 1305 VFD Upgrade RecommendationsI have five AB 1305 VFDs controlling 1hp to 1.5hp motors. They still work, but the housing is falling apart and it could be a risk of shock. Does anyone have recommendations on a PowerFlex upgrade? PF4, PF40, PF523... Thank you. [/INST] While there is a conversion document to go from 1305 to PF40, I wouldn't recommend it. If you still have 1305s running, I'd grab the newer drives so that you don't have to go through the conversion process AGAIN when a more mature drive family like the PF4 or PF40 also becomes discontinued. I would recommend using the PF523. \\n </s>