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Onan LT II Transfer Switch JB 7.5


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  #21  
Old 06-10-2017, 06:42:56 AM
JohnnyC JohnnyC is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

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Originally Posted by Billy J Shafer View Post
I thought about that. But in all my years with Onan. I have never seen the remote test switch used. Even at places where they were supposed to have one.
Interesting.... Billy, Why would anyone want or require a remote test switch when there is a switch for test inside the box? Is the test switch function used a lot by techs during maintenance since they would be the only ones using it? Would it be a good practice as an installer /tech to install a test switch? Where would the remote test switch normally be mounted? Sorry for all the questions, but that missing little jumper kicked my azzzzzz until I read the schematics and went over each circuit.

I won't be able to get answers or any history that I don't already know from the Onan dealer where the JB and transfer switch was purchased from even though I have their records on their company letterhead. Their phone number now belongs to a Target store and nothing found on the internet. I assume the dealer has been long out of business and the JB /LT II was decommissioned long ago too and put into storage until I bought it last January.

JohnnyC
New Jersey

Last edited by JohnnyC; 06-10-2017 at 07:11:46 AM.
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  #22  
Old 06-10-2017, 08:22:24 AM
JohnnyC JohnnyC is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

Billy, after my last posting I decided to read at the LT II Operator's Manual while riding the porcelain pony (the place I do my best reading). I found a section where is mentions terminals 11 and 12 on the control lug strip. The manual states this is where the remote test switch would be wired into, which we already know, OR where Remote Area Protection Equipment. QUESTION: What do they mean by remote area equipment? An optional array of something? (See a picture of the section from the manual below).

Sorry for all the questions, but Grasshopper wants to learn.

Thanks,
JohnnyC
New Jersey
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  #23  
Old 06-10-2017, 10:31:46 AM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

The remote test switch would be used at control centers. Say the control center was on the 20th floor transfer switch was in the basement. Instead of walking all that way. Reach over and flip the switch.

The area protection would be used. If you had a part of a plant that needed protection. You would wire in a power monitor relay system. If the plant was getting good power. But the section with the protection was not. The transfer switch would not know it. So a protection switch was used that would tell the system to come on. It did take some extra wiring on some jobs. I did see one system work at one store. I have a control box from the system at the old Marlin Texas hospital.

What was the dealers name
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Old 06-10-2017, 11:49:20 AM
Steve Dawkins Steve Dawkins is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

Years ago, we installed a JC and ats at six remote microwave repeater sites throughout North & South Carolina. The sites were for Carolina Power & Light. I never thought about a remote test feature for a genset, but those sites would have been a perfect application. A signal could be sent via telemetry to a site, closing a relay contact, and testing the generator and ats without having to visit the site.
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  #25  
Old 06-10-2017, 12:08:35 PM
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Billy J Shafer Billy J Shafer is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

Steve you might enjoy this one. When I worked for Cat. We built up some Lister for NASA tracking stations. We heard this from the NASA man in charge of the project.

Some of the stations were having trouble. Starting a all different times in the day. Mostly morning and evening. He went to one site found nothing. While making out the report. The generator started.Looked outside and found monkeys. Making beds for the night. Some how they were messing with the sat signal. Ended up putting screens on top.
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Old 06-10-2017, 12:38:18 PM
Steve Dawkins Steve Dawkins is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

Billy, that's a hoot. Who would have ever guessed such a problem.

On the project for CP&L, the 6 locations we did completed a loop of these sites throughout the Carolinas. This was back in the late 70s or early 80s, I don't remember which. Each site consisted of a 8'x8'x16' stainless steel comm building, a 300' tall microwave tower, and a JC generator. At the time, the sole purpose of each site was to support a wall telephone, identical to what would be in your house. It was for CP&L techs to be able to communicate from remote locations. Certainly this was much cheaper than putting a few coins in a pay phone at the time! I think the ultimate goal was for the power company to be able to remotely operate their electrical substations.

Most of these sites were in very rural areas. One site we were at, the CP&L rep told us he was waiting to visit a site someday and see skid marks in the farm field from where the generator had been dragged off with a tractor. At another site, while we were doing start up, there was a swarm of bees clustered around the tower. The swarm would travel from the top of the tower down to about 4 feet above ground, and then back up the tower again. Strange phenomenon. They looked like a dark cloud that constantly moved. The generator was about 5 feet from the base of the tower. While we were prepping the gen for startup, we kept a close watch on the bees, and backed away when they got down to about 15' above ground. Once they hit bottom and headed back up the tower, we would resume our duties.
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  #27  
Old 06-10-2017, 02:25:24 PM
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Default Re: Onan LT II Transfer Switch / JB 7.5

In Texas we had microwave towers every thirty miles. If nothing went wrong you could get five services done in one day. The one I hated the most.Was at Brownwood Texas. You had to put on rain gear run to the generator and not look up. It was a nesting area for buzzerds
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Old 06-10-2017, 02:55:42 PM
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Default Re: Onan LT II Transfer Switch / JB 7.5

Yes, I remember 30 miles. They said that microwave communication was good for about 30 miles. By the time we got involved, they had built these microwave relay stations every 30 miles throughout the Carolinas. If you looked at a map of the sites, it formed a "C". The six sites we were involved with closed the C to make a complete loop.

All things considered, I guess bees would be better than buzzards. I guess you didn't stand still too long at that site, for fear that the buzzards might think you were dinner.
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Old 06-10-2017, 03:33:40 PM
JohnnyC JohnnyC is offline
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Default Re: Onan LT II Transfer Switch / JB 7.5

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Originally Posted by Billy J Shafer View Post
---- snip ----
What was the dealers name
Billy, thanks for the information.

I found two company names but the primary name I found on the switch, JB and all the documentation is Keystone Onan Power, Inc. The business card for this company, had name - Renny Picchini. The phone number for Keystone Onan Power now belongs to a Target store in the same city (Harrisburg, Pa). I called the number and asked the Target store customer service person how long was Target in Harrisburg been in business. The person responded that she worked there 5 years and the Target store was already there at the beginning of her employment, but she does not know exactly when the store was built. The second name found on the ATS is Cummings Power Systems, Inc. I called the Harrisburg number for this company. I got a recording that repeated "No routes found". The other phone numbers for other branch offices seem to be valid, but were closed today.

The JB and ATS were bought in Harrisburg Pa, and installed in a school located in Harrisburg, Pa according to my documentation. The serial numbers on the ATS and JB show a 1 month difference for production, so I am very confident they were installed as a pair. It's function was to power a lighting system during power failures.

JohnnyC
New Jersey
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  #30  
Old 08-07-2017, 01:53:33 PM
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Default Re: Onan LT II Transfer Switch / JB 7.5

Thanks for all the info on this post. Came late to this thread.
This stuff is right up my ally and did learn some things about this model
Onan ATS.
Can someone post the schematic/ wiring diagram and manual for this LT II model? I have the OT I & OTII but not this one.
BTW I have a pretty good library of the old Zenith, ASCO, Russelectric, Kohler, etc dwgs & manuals if someone is interested.
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