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New Addition - Onan 7.5 JB FL


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  #1  
Old 07-06-2011, 04:24 PM
GlennC GlennC is offline
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Default New Addition - Onan 7.5 JB FL

Greetings everyone,

I just acquired this unit, the placard info is;

7.5JB FL
SN G930514103
Spec 55397D
Options B31 D13 H1 H49
Wiring Diagram 612-6115-02

I would be very grateful for anything you can find on this. I believe the Engine Service Man is 967-0754 and the Generator Service Man is 900-0184, If those are the correct numbers I already have a copy of them. Not sure what parts manual I need and cannot locate the wiring diagram listed above. If anyone can get a build sheet and/or info on the options that would be great too.

Already have it running, just need to rewire the output for 120/208 3ph, re-adjust the carb and load test it.

Thanks in advance
Glenn
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Old 07-06-2011, 05:55 PM
Dave Edmonds Dave Edmonds is offline
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Talking Re: New Addition - 7.5 JB FL

Watch out for the green fever - these things attract each other!
Dave Edmonds
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Old 07-06-2011, 07:57 PM
Max Thompson Max Thompson is offline
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Default Re: New Addition - 7.5 JB FL

If you will send me or post an e-mail address I will get you the parts manual. Is this another unit from Toledo Ohio? The wiring diagram you need should be on the inside of the junction box cover.
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Old 07-06-2011, 08:42 PM
GlennC GlennC is offline
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Default Re: New Addition - 7.5 JB FL

Dave, It is a newer unit than the one I acquired earlier this year, and for under $600 I couldn't go wrong... So now I will probably mount the older unit on a trailer and setup the newer one as backup for the house. Then I can rent out the trailer during any long outages lol.

Max, Thanks, I will pm you my email. I found this unit in Florida. Yes the wiring diagram is on the cover had it in my hands 4 or 5 times now and never turned it over.

I was thinking 120/208 3 phase but since I have no need for 3 phase in the house or shop (yet) I need to reconsider. Can anyone tell me which configuration, (120/208 3 phase, 120/240 3 phase or 120/240 1 phase) is better and for what reason?

Thanks in advance,

Glenn
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Old 07-07-2011, 09:54 AM
Dave Edmonds Dave Edmonds is offline
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Smile Re: New Addition - 7.5 JB FL

If it's not an extended stack, the unit will deliver only 2/3 of its rated power into a 120-240 single-phase load. The nameplate will tell you whether it's extended stack - the single-phase and three-phase ratings are the same on an extended stack; the single-phase rating is only 2/3 of the 3-phase rating on a standard genend. (I "lucked out" on the 20ES that is the standby for my house - it happened to be extended stack - wired 120/240 single-phase.)
How you wire it depends on what you need to run with it, and what it's 3-phase vs. single-phase rating is.
Dave Edmonds
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Old 07-07-2011, 08:30 PM
Max Thompson Max Thompson is offline
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Default Re: New Addition - 7.5 JB FL

The FL voltage code will deliver full output in single phase.
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Old 07-07-2011, 09:51 PM
GlennC GlennC is offline
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Default Re: New Addition - 7.5 JB FL

Is there someplace in the manuals I can get the actual amperage available on each leg for the different configurations? The placard only shows;
HZ: 60
RPM: 1800
PF: 0.8
KW: 7.5
KVA: 9.37
VOLTS:
AMPS:

Also where can I find out what the option codes mean?

Thanks,
Glenn
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Old 07-07-2011, 11:56 PM
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Default Re: New Addition - 7.5 JB FL

Glen,

The option codes are a bit of a mystery. As far as I know, no one here has access to a complete list. Some are decoded here:

http://www.smokstak.com/forum/showth...light=extended

Also, I don't think 'FL' necessarily means extended stack. Read this:

http://www.smokstak.com/forum/showth...highlight=b150

In a nutshell: look for a 3.75" stack length...
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Old 07-08-2011, 08:19 AM
Max Thompson Max Thompson is offline
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Default Re: New Addition - 7.5 JB FL

All 4 of the JBs I got from Ohio are 1993 mfg. with FL voltage codes. Data plate shows 26 amps in 3-phase, & 31 amps. in single phase.
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Old 07-08-2011, 08:53 AM
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Default Re: New Addition - 7.5 JB FL

Same here, Max. 4 out of 4 'FL' gensets were extended stack.

But, all had option code B150.

Do yours also have option code B150?

---------- Post added at 08:53 AM ---------- Previous post was at 08:50 AM ----------

Glenn - Let us know the stack length...
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Old 07-08-2011, 08:54 AM
GlennC GlennC is offline
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Default Re: New Addition - 7.5 JB FL

These are the codes from the placard;

Options B31 D13 H1 H49

Is it possible that it has the extended stack and not listed as an option code?

I will have to measure it when I get home today. BTW, what exactly am I measuring?
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Old 07-08-2011, 10:27 AM
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Talking Re: New Addition - Onan 7.5 JB FL

Stack Length is measured by measuring the Laminations of the Stack as they appear on the outside of the Genend, between the End Caps. Measure from Engine end to End Bell end. The procedure, and table are listed in the YD Manual.
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Old 07-08-2011, 10:30 AM
Max Thompson Max Thompson is offline
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Default Re: New Addition - Onan 7.5 JB FL

Jim:
Your are correct, mine do list option code B-150
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Old 07-08-2011, 01:25 PM
GlennC GlennC is offline
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Default Re: New Addition - Onan 7.5 JB FL

The stack is 3.1 inches wide if I am measuring correctly. See picture...
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Old 07-08-2011, 01:37 PM
GlennC GlennC is offline
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Default Re: New Addition - Onan 7.5 JB FL

Would the Build List Sheet or Production Order answer this question?
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Old 07-08-2011, 01:56 PM
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Default Re: New Addition - Onan 7.5 JB FL

If I measure the gap between the end caps on the genend it is 3.25". In the picture I was trying to measure the part of the stack that stood out. Took another pic.

My 1980 model 7.5JB/3CR has a stack width of 3.2" and it has a 4 wire genend....
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Old 07-08-2011, 09:31 PM
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Default Re: New Addition - Onan 7.5 JB FL

3.1 inches on a 12-wire 'FL' machine indicates standard stack length. Were it me, I'd set it up for double-delta (120/240V single phase) and keep the line current under 26 Amps. Had it been extended stack, you could draw 31 Amps.

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Originally Posted by GlennC View Post
Would the Build List Sheet or Production Order answer this question?
Yes, good luck finding it...
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Old 07-09-2011, 11:22 AM
GlennC GlennC is offline
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Default Re: New Addition - Onan 7.5 JB FL

Wiring it double-delta gives me 3 leads (L0, L1, L2). I assume then that L0 is neutural and L1,L2 are the 2 hot legs. Does that mean if I only use 120v loads I can get up to 26 amps per leg, L0-L1 and L0-L2? I assume then that if I use any 240v loads it reduces the amount of current available on each 120v leg by about half the total 240v load.
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Old 07-09-2011, 11:41 AM
Wayne 440 Wayne 440 is offline
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Default Re: New Addition - Onan 7.5 JB FL

Your capacity is 26 amps per "leg", regardless of how you load the set. For instance, you might have a 120V saw that draws 10A on L1, and a 120V light that draws 5A on L2. If you want to plug in a 240v heater that draws 16A you are fine, since L1= 26A and L2 = 21A, but a 20A 240V heater (making L1 = 30A and L2 = 25A) would be an overload unless you shut off the saw.

If you had both previous 120v loads on the same leg, you could only use a 11A 240V device without overload. (you would have 11A on one leg, 26A on the other)
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Old 07-09-2011, 11:49 AM
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Default Re: New Addition - Onan 7.5 JB FL

What is the difference between double-delta and parallel-delta other than it only provides 120v 1 phase? Does that configuration only provide 26 amps?
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