Rectifier output

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Grouch

Grouch

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New York, NY
Hi all,
I'm doing a job at a site that has an existing rectifier, I attached a pic of the rectifier nameplate. I also attached a pic of the wiring on the output of the rectifier. The 2 large black wires would be the + and - wires, the green is the ground wire... but what is the white wire for in this case? it's sized at #2 AWG. It's not a neutral since this is DC, unless i'm not understanding something. what would it be? I tried looking up specs on this rectifier, but I couldn't find anything.

Thanks!
 

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I posted another pic... this disconnect switch is at the output of the rectifier. The wires from the rectifier come in from the bottom of the switch, and the load goes out the top of the switch. The 2 fuses are rated 300 amps.
 

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Grouch1980 said:
Hi all,
I'm doing a job at a site that has an existing rectifier, I attached a pic of the rectifier nameplate. I also attached a pic of the wiring on the output of the rectifier. The 2 large black wires would be the + and - wires, the green is the ground wire... but what is the white wire for in this case? it's sized at #2 AWG. It's not a neutral since this is DC, unless i'm not understanding something. what would it be? I tried looking up specs on this rectifier, but I couldn't find anything.

Thanks!
Click to expand...

Unless the cable is single core, it could be sensing - DC volts or heatsink thermal switches are a couple of possibilities.
Switch position monitoring?
 
I'd call that company. Their number is on the nameplate. Make sure you have that info from the plate when you call.
Rectifier 52FB
EU model 400200
K = 200-9
Date Code = 04-06
 
mgookin said:
I'd call that company. Their number is on the nameplate. Make sure you have that info from the plate when you call.
Rectifier 52FB
EU model 400200
K = 200-9
Date Code = 04-06
Click to expand...

When I went to the website the name has changed and appears to be bought out by Eaton.
 
Google search of the phone number still shows a full page of listings for Empire.
Even if Eaton owns it, they're likely still going to answer the phone.
 
Thanks everyone for the feedback. I just called the phone number on the nameplate (the simplest thing, call the number!! didn't register in my head I could do that tiny little task :) ). The company, Empire Rectifier, did go out of business, but the person I spoke to is responsible for servicing the equipment. He said that white wire should be connecting to an Xo terminal inside the transformer of the rectifier. That white wire is letting you have a different voltage... in this case 120 volts when taken between the white wire and one of the black wires. The disconnect switch feeds a DC distribution board that is located in an adjacent building, and so this installation gives a dual voltage DC distribution board... 120/240 volts DC.

He also said he THINKS the white wire connects to the Xo terminal. if it doesn't, then he doesn't know what it's for. But I think what he said makes sense, having a dual voltage output.
 
Grouch1980 said:
Thanks everyone for the feedback. I just called the phone number on the nameplate (the simplest thing, call the number!! didn't register in my head I could do that tiny little task :) ). The company, Empire Rectifier, did go out of business, but the person I spoke to is responsible for servicing the equipment. He said that white wire should be connecting to an Xo terminal inside the transformer of the rectifier. That white wire is letting you have a different voltage... in this case 120 volts when taken between the white wire and one of the black wires. The disconnect switch feeds a DC distribution board that is located in an adjacent building, and so this installation gives a dual voltage DC distribution board... 120/240 volts DC.

He also said he THINKS the white wire connects to the Xo terminal. if it doesn't, then he doesn't know what it's for. But I think what he said makes sense, having a dual voltage output.
Click to expand...
What you described is as I said, a bipolar DC output, with the white wire being a neutral... or common as often referred to in DC circles.
 
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