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#28226 11/18/19 10:45 PM
Joined: Jan 2015
Posts: 118
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Joined: Jan 2015
Posts: 118
I see several possibilities that may have added to damag.
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Joined: Nov 2009
Posts: 468
Journeyman
Journeyman
Joined: Nov 2009
Posts: 468
Sounds like the car did not suicide properly. Proper crank up procedures were not followed

Joined: Dec 2010
Posts: 639
Likes: 4
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Joined: Dec 2010
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All from a generator swap? Wow...that’s no stupid controller either.
Rocketing into the OH like the pictures show, seems like a catastrophic brake failure.
It would be of interest as to the list of “whys” this accident happened.
B2 (or 4) up to 39 is a hell of a long ways to generate speed and momentum! Very very fortunate no one was in that cab. I can’t imagine......

Joined: Feb 2013
Posts: 800
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old hand
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Joined: Feb 2013
Posts: 800
I agree, Brake failure is very possibly the culprit. The controller should have faulted, and set the brake.

Joined: Aug 2016
Posts: 35
newbie
newbie
Joined: Aug 2016
Posts: 35
But did you read the suggestions on how to prevent this?
Some are relevant, some don't strike me as being all that helpful.

1. Notify supervisor before changing generator.
----> Uh... yeah. Because the supervisor would have foreseen this.

2. JHA
---> Uh... yeah. Because a JHA would have prevented this.

3. Car in center of hoist way.
---> Because after 20 floors the car would have been going slower than after 40 floors?

4. Put car on inspection.
---> Always. This is aways good advice. Going to AUTO should be the LAST step.

5. Maintain visual.
---> True dat. This is why I'm not a fan of MRL's.

6. Check direction on INS.
---> Again, testing in INS is always good practice.

7. Second person to pull the disconnect.
---> A buddy is fine. But always know where the disconnect is. When things get too weird and you don't know what's going on, kill it. It might not have helped in this case, but the option should always be in our minds.


One take-away is that brakes are kind of important. That's why they need to be tested. If the car needs to be shut down until the office can send out weights, then the car will just have to be down. It's an inconvenience, but not as inconvenient as an injury or death. These guys were lucky.

Joined: Jul 2018
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journeyman
journeyman
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Joined: Jul 2018
Posts: 71
Likes: 2
drift car into overhead before startup, this was otis protocol on 401s with ward leonard in my area. pulling the disconnect may not do anything if genset has been labeled wrong by motor shop and/or wired wrong in the field. also can drive through the brake.

Joined: Jan 2010
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If F1 and F2 were different the car will run in the opposite direction and will not slow down as it’s looking for down when it is running up.

Last edited by danzeitz; 11/27/19 07:43 PM.
Joined: Jan 2010
Posts: 671
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Posts: 671
Never mind this controller should of caught that. Was thinking of relay type.


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