How to Identify a conductor type

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DownRiverGUy

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Canton, MI
So I am troubleshooting a failing VFD and I wanted to make sure the correct conductors were used. I was able to get these markings off the conductors but they seem a bit Greek to me.... Can anyone give me a hand?

CT USE(UL) OR C(UL) TYPE T90 NYLON OR TWN 75 FTI 13/JAN/10 15:11 3410 4728 5283 99 NC

After a few google lookups I can see that this would meet our requirement for THHN but for the life of me I can't find what would say the gauge of the wire :(

Also assuming that the wire was made Jan 13th 2010 :p I'm so smart!

Is that not all the information from the conductor? I was only able to write out what I could find in the controller.

Any other info needed please let me know!

Thanks folks,

Chris
 
What length of cable are you running from the VFD to the motors? Longer runs may need to use VFD cable that is shielded.

Also what size are we talking about 10hp 20hp to maybe 200hp?

VFDs generate a square wave that have alot of noise (harmonics) this can cause problems for all kinds of equipment near it, including its own electronics. Maybe just an idea or direction to go...
 
That was the first PDF I saw when I did a Google search. It helped but did not answer all my questions.

The cable length from the VFD to motor is maybe 10'. The motor is pretty much right next to the VFD.

The motor and VFD ratings are 100HP.

Not sure I follow Dennis... the conductors are in conduit from the VFD to the motor. I?m not familiar with the "cable tray wire" or "CT". May just be having a brain fart today :-x


I think the problem actually may not have anything to do with the wiring now. The VFD is shutting down due to overheating (a code comes up stating that).

The VFD has an inlet on the bottom and vents out the top of the unit. The unit itself has to be in its own enclosure because of a "DC reactor" on the incoming side of the VFD. The enclosure has plenty of room inside it and has large vents directly over and below the vents of the VFD however they mounted the DC reactor below the air inlet for the VFD.

I'm requesting that they do temperature measurements at the inlet (inside the enclosure), the outlet (inside the enclosure), and the inlet outside the enclosure.

Anyone have experience with a "DC reactor?? Do these guys get hot under full load?

PS the error code comes on after over an hour of full load running of the VFD/motor.
 
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