Unknown Piece of Electrical Equipment (pics) Identify

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Discussion Overview

The discussion centers around identifying an unknown piece of electrical equipment, specifically a cabinet containing contactors. Participants explore various hypotheses regarding its function and application, with a focus on its potential use in industrial machinery.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Gunnar, the original poster, suggests the equipment might be a load bank or transformer, expressing uncertainty due to their background as a mechanical engineer.
  • One participant identifies the equipment as containing six contactors and describes the function of the arc chute and blowout coil, suggesting it is likely used for motors.
  • This participant also mentions their experience with similar contactors in maintenance roles, indicating they are used in dynamic retarding of traction motors in Komatsu haul trucks.
  • Another participant questions the purpose of the six vertical red structures with white dots and requests close-up images for further analysis, speculating that the cabinet is custom-made for specific machinery.
  • Gunnar acknowledges the helpful responses and mentions the limited availability of additional images from the job site.
  • Another participant proposes that the equipment could be a rectifier with DC output contactors and questions if it is mothballed, seeking clarification on the need for identification and location.
  • One participant suggests that if rectifiers are involved, the equipment might be a large battery charger.

Areas of Agreement / Disagreement

Participants present multiple competing views regarding the identification and function of the equipment, with no consensus reached on its exact nature or application.

Contextual Notes

Participants express uncertainty regarding specific components and their functions, and there are limitations in the available images for accurate identification.

Goonstuff
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Greetings all,

I need some help identifying a piece of electrical equipment for work.. I myself am a mechanical engineer and have never seen something like this. I have attached pictures below.

http://imgur.com/a/J0B8H

My initial thoughts was that it was some kind of loadbank or transformer. ANY help would be greatly appreciated. Thanks

-Gunnar
 
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They are six contactors. The black housing is an arc chute. It contains the arc when the tips of the contact are broken. A low voltage power a coil which creates a magnetic field to close a circuit with a larger voltage. The larger coil behind the arc chute is a blowout coil

As for what they are feeding, it could be anything. Likely, motors

I do maintenance on contactors of this type at my work daily,

Adjusting coil voltage for closing, drop-out voltages, changing pitted contacts tips, pitted arc chutes, etc...

The smaller wires coming from the contact are for numerous things. It needs to power the coil, it needs a supressor across the coil when the circuit is broken (resistor and cap) it needs also feedback so the controller knows that the tips are closed when the command to close is given. It also needs to know if a contact closes without a signal applied to the coil, which would be bad.

In my work these contactors are used on komatsu haul trucks for dynamic retarding of traction motors. When you want to brake an electric motor, you can release it from its supply voltage and its inertia ensures it is generating. An electrical load attached to the motor (through contactors) ensures the motor can be controlled to brake.

Honestly, if I had to guess, I would say this is from some piece of mobile mining equipment. Such as a B&E or P&H mining shovel or blasting drill... attached is a pic I took of a contact cabinet from a P&H drill (note the contactors)

I'm know what u have is a contactor cabinet - I don't know for what exactly..
 

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What are the six vertical structures that are red with white dots? Can you provide a closeup of these?

And closeups of the other equipment in the cabinet - need individual closeup images!

But at a guess this is a custom electrical cabinet for some piece of machinery; I used to work for an electrical controls company and everything that goes into a plant had to be enclosed in a cabinet like this (painted to match their particular code).
 
Guys, I really appreciate the help. Foiwater, great response. Ill do some research on what you suggested.

These are the only other close up pictures I have. I would have more pictures but I am not at this particular job site.

They are of the two components in the upper left hand corner and a semi-closeup of the six contactors in a different unit.

Thank you.
 

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  • Unit 1 Int Comp ACME Info.jpeg
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  • Unit 2 Inside.jpeg
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I am thinking the whole thing is a rectifier and DC output contactors, load break, some are paralleled. Is this sitting in somewhere mothballed?

Why do you need it identified? Where are you located?
 
If rectifiers are involved, possibly a very large battery charger?
 

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