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I am working on a project to install new equipment in one of our Canadian facilites. Do I need to install 1000-Volt rated VFD cable on the load side of 480-Volt VFDs to pass inspection in Ontario? Thanks, Kigif

Stan, I am assuming this is a press section. Typically the primary drive will be run in speed, the other driven rolls will be run in torque mode as helpers. If Brock did the integration, I would doubt that your problem is the control scheme, those guys are very good with web applications. If I...

Scottf, Yes, we are checking for DC resistance/continuity. I am at somewhat of a disadvantage in trouble-shooting this problem as I work in a corporate group at HQ and am relying on a technician in the field to provide the information. The technician disconnected the CTs completely to make the...

GordS, I am not sure exactly what the ratio is, but this is a fairly large system with many cables, surge caps, and PF caps. I beleive the former is greater than the latter and understand your comments on overvoltage with an intermittent fault. This is what is so curious to me. The primary of...

Guys, Thanks for the input. RC, The secondary is wye, resistance ground. The transformer is a 10 MVA utility owned unit, I am not sure of the relaying setup. Thanks, K

We have experienced several CT failures that have us scratching our heads. The CTs are bar-type, 5kV, 150/5A. Each set is in a motor starter operating on a 2.3kV system. The first failure occurred about three weeks ago. Motor was running, tripped, continued to trip on re-start. Technician...