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  1. Curtis with Low Frequency Squeal

    Controllers
    I have a Curtis 1221 PO51, which is an early (1994?) transition from the 120VDC 1221 to the 1231C for 144 VDC. I am running it at 144V within a very conventional series DC configuration as per the Curtis manual wiring diagram, with the except of the A2 plugging motor lead for forklifts being...
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