DC Gear motor in hazardous location

[shull]

It appears to be a"C" Face gear box, so you could replace just the motor with explosion proof DC Motors & cut your costs considerably. Where are the controllers? There is no way to get around the cost, it will be very expensive. Good luck, Ron

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[housemoney]

It appears to be a"C" Face gear box, so you could replace just the motor with explosion proof DC Motors & cut your costs considerably. Where are the controllers? There is no way to get around the cost, it will be very expensive. Good luck, Ron

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OK now I'm confused- the units circled below are Allen Bradley 1204 motor terminators. This would indicate AC induction motor- It is a long ways from the gear to this room so that would explain their use for reflected waves to the drives? There are no C1/D1/2 wiring methods in this room-

I am picking this up as a sub of a sub and did not get to walk through yet- just going off of notes at this point, have not seen gear/service equip yet.



No absolutely nothing has changed at this facility in 15 years and the designing eng. firm is out of business.

 

[Besoeker]

Please, lets drop the could-should p***ing contest. The 1st 8 posts pretty well answered the question but I'd like to keep the thread open and on-topic in case anyone can help the OP with factual input.

Not a contest. We can't state with certainty what might have happened. The fact that it didn't in 15 years doesn't mean it won't happen tomorrow. And that's the reason I'm saying it is not a good measure of the integrity of the existing system. It is a non sequitur.
But I expect that this will go the same way as other posts.

 

[kwired]

It appears to be a"C" Face gear box, so you could replace just the motor with explosion proof DC Motors & cut your costs considerably. Where are the controllers? There is no way to get around the cost, it will be very expensive. Good luck, Ron

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That helps with the electrical side of ratings. The gear box could still reach too high temp and be a potential ignition source, or have potential spark producing components during a failure. There are hazardous location fans that have aluminum instead of steel fan blades - so they don't spark if they rub against other steel components.

 

[kwired]

Thank you, rbalex.


Could have.

Could is probably the correct answer. But I think his intent was that if it truly was a division 1 location the chance of something happening with improper rated equipment is pretty high.

 

[augie47]

B, Just can't let it die, can you ?
Post deleted !
(I originally closed the thread but felt that was unfair to the OP)

 

[petersonra]

I would like to add a suggestion here. If this was originally designed incorrectly there may be liability on the part of the original firm that did the design work. Even if they are out of business their liability insurance company probably isn't. It might make sense for the owner's lawyer to take a look at that aspect of the situation.

 

[Jraef]

OK now I'm confused- the units circled below are Allen Bradley 1204 motor terminators. This would indicate AC induction motor- It is a long ways from the gear to this room so that would explain their use for reflected waves to the drives? There are no C1/D1/2 wiring methods in this room-

I am picking this up as a sub of a sub and did not get to walk through yet- just going off of notes at this point, have not seen gear/service equip yet.

View attachment 20110

No absolutely nothing has changed at this facility in 15 years and the designing eng. firm is out of business.

Yes, those are indeed A-B motor terminators, so those are AC motors and there are probably VFDs somewhere feeding them. But those themselves are not going to be Cl1Div1 rated, so they will have to go. You can probably replace them with DV/DT filters at the VFD end though. The Terminators were/are a solution for people that didn't plan well in advance though, so you may have a bit of a dance to find room for them now.

In SEW world, you must buy the MOTOR as HazLoc-NA (North America), but they can be coupled with any of their gearboxes. So you can most likely get documentation on the combo as classified for your use, but the motors might have to be changed. That said, if this is on something like a grit conveyor, it's possible that the OEM actually DID use the HazLoc-NA motors. The OEMs for a lot of WW equipment know to do that and it's standard for them, you just may not know it. I'd suggest recording ALL of the part numbers and getting in touch with SEW on this before tossing around a lot of money.

 

[Besoeker]

B, Just can't let it die, can you ?
Post deleted !

I go with truth.
Is that unacceptable here?