electrocube

Feb 23, 2011 5 Replies

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Karl Townsend 15 years ago

I just finished the complete tear down of my spare Excello machine. The large castings go outside in the boneyard. All the small parts fit on two pallets and will go into warehouse storage.

Anyway, I came across a maybe useful part I haven't seen before. its called an electrocube RG1801 and its mounted on the load side of three phase contactors. Imagine an equilateral triangle or delta. The points of the triangle are the three phases. Each leg of the triangle has a .47 MFD cap and a 220 ohm resistor. Must be some sort of filter. Whet's the purpose here and should it be used on other three phase devices?

Karl

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stans4 15 years ago

Somebody else probably has a better idea, the only thing I can thing of, given its location, is a snubber to kill at least some of the spikes when the contacter kicks in and out. I assume the resistor and capacitor are in series on each leg. Would be nice to have a voltage spec on the cap and a power rating on the resistor, though.

Stan

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Pete C. 15 years ago

It's called a "snubber" and is used to control contact arcing and burning. I've not seen a three phase brick version, but the single phase blocks are very common in CNC machines.

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John 15 years ago

They usually get put on the contacts of a three phase contactor to supress transent spikes. They usually look like a black cube with a place for bolting them to a surface and have three wires coming out of them. Almost all the contactors in CNC machines have them.

John

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Don Foreman 15 years ago

Electrocube is a manufacturer of film capacitors. They've been around a long time.

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Pete C. 15 years ago

Karl already noted that the contents of the cube include a capacitor

*and* a resistor. It is a three phase version of a standard snubber block, not a simple capacitor.

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