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We have an Ingersol Rand Unigy IRN-11-8-H with software upgrade increasing current to 21.9 amps and 1.70 cubic meters/min. It has the option switch selecting ramp-up or down or just standard off and on with pressure switch. It will not start with ramp-up selected and sounds awful. It sounds like it is single phasing but everything checks out. It will run on the standard off and on. Is there something easily sorted on the intellidrive unit?

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Unfortunately, that drive is pretty well "cleansed". I-R is not like many compressor manufacturers who use a standard Siemens or Allen Bradley drive. They use something obscure and modify it so that you can't get outside support. You will have to go to a IR distributor.

As a side note, the Unigy series was plagued with problems. They had a 120% failure rate, meaning on average that each one failed more than once during the warranty period.

Posted on Mar 15, 2011

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