Generators and Motors
[Home] - [HELP] - [Forums] - [Library] - [Photo Gallery] - [Groups] - [Classified Ads] - [Subscribe] - [Links] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Vintage Electrical Equipment > Generators & Electric Motors General Discussion > Kohler Generators
Forgot Password? Join Us!

Notices

Kohler Generators Restoring, maintaining and operating vintage Kohler generators.

Kohler Generators

Kohler Electric Plant 15R61 low output


this thread has 17 replies and has been viewed 646 times

Reply
 
Thread Tools Display Modes
  #11  
Old 01-10-2019, 12:58:57 AM
mrh0t mrh0t is offline
Registered
 
Join Date: Sep 2017
Location: High Springs, Florida
Posts: 10
Thanks: 0
Thanked 1 Time in 1 Post
Default Re: Kohler Electric Plant 15R61 low output

Thanks everyone for your input. Sorry it took so long to get back to this, but with the holidays, and caring for my disabled wife, I'm really busy.

I'm sure I could fashion a band out of brass or copper, but the original band is pretty strong "springy" steel, and I don't know if a softer metal would work for long?

I thought I might just swap out one or both resistors, if they're not too costly. I got some Kohler info on them, and my model specifies either 4 ohm or 2.5 ohm resistors, with my variation specifying the 2.5 ohm unit. With my cheap VOM, which "zeros" out at 1.3 ohms, I measured 4.0 ohms across each resistor, so (4.0 - 1.3= 2.7 ohms), close enough to 2.5 ohms. The lower right resistor, with the band intact, measures (1.7 - 1.3 = 0.4 ohms) effective resistance, and the one with the broken band measures (2.8 - 1.3 = 1.5 ohm) resistance to the point where the band was situated.

I even got an original Kohler part number for the resistors, which is probably pretty useless at this point, but for reference, it's #265241.

I'll look at the rectifier issue once I get this squared away.

Thanks all,
Harry
Reply With Quote
The Following User Says Thank You to mrh0t For This Post:
Sponsored Links
  #12  
Old 01-10-2019, 01:53:11 PM
Zephyr7 Zephyr7 is online now
Registered-III
 
Join Date: Mar 2017
Location: Davisburg, Michigan
Posts: 1,210
Thanks: 313
Thanked 654 Times in 440 Posts
Default Re: Kohler Electric Plant 15R61 low output

I think those resistor bands were usually made from something like tin plated brass. I doubt very much they were ever made from steel, and Iím sure not stainless steel. Myself, Iíd probably look for some tin plated brass or copper, and if I couldnít find that, Iíd just use brass sheet. Itís not very critical.

I wouldnít trust your meter for those very low ohm readings. Even the oxide on the surface of whatever you poke the probe at to make a measurement can result in big errors. You might want to try the poor-mans low-ohm measuring technique: use a light bulb and put the resistor in series with it. Measure the current drawn. Measure the voltage across the resistor. Resistance can be calculated as V/I=R, so divide the voltage you measured across the resistor by the current you measured (in amps) to get the resistance of the resistor. This will be more accurate in many cases than trying to measure the resistance directly with a normal ohmmeter.

Bill
Reply With Quote
  #13  
Old 01-10-2019, 03:57:25 PM
BergmanJ BergmanJ is offline
Registered-II
 
Join Date: Apr 2005
Location: Duluth, Minnesota USA
Posts: 485
Thanks: 517
Thanked 276 Times in 163 Posts
Default Re: Kohler Electric Plant 15R61 low output

Lots of those "adjustable" bands were made from tin-plated steel as used in many different electrical applications (not just generators). Retired now; but, have seen quite a few rusted-through during my "working" life.

Regards, JLB
Reply With Quote
The Following User Says Thank You to BergmanJ For This Post:
  #14  
Old 01-26-2019, 01:05:55 AM
mrh0t mrh0t is offline
Registered
 
Join Date: Sep 2017
Location: High Springs, Florida
Posts: 10
Thanks: 0
Thanked 1 Time in 1 Post
Default Re: Kohler Electric Plant 15R61 low output

Here's the latest everyone. I was able to buy a couple Ohmite steel replacement bands on eBay for $6 and change. They were 5 days late on delivery, but worth the wait. When the latest storms blew through we lost our power, so I started to fashion a band from plumbers' strapping. Setting the steel band on a 1/4-20 nut, and using a center punch, produced a nice dimple in the band. Then the lights came back on, and project home-made-band was abandoned.

When they arrived, I soldered one of the new bands in place, and positioned it where the old band sat. Cranked it over, and it's putting out 115V on each leg. Are these variable resistors used to balance the output of the two legs? How closely do the voltages have to be, when they're combined to get 230V? I'm not sure how that works in real life.

Yes, all the connections on this unit need a good cleaning.

I had to quit for the night, but this was great news. Thanks everyone!
Reply With Quote
  #15  
Old 01-26-2019, 07:48:12 AM
I like oldstuff I like oldstuff is offline
Subscriber
 
Join Date: Jan 2012
Location: Milwaukee, Wisconsin, USA
Posts: 5,662
Thanks: 1,375
Thanked 6,038 Times in 2,354 Posts
Default Re: Kohler Electric Plant 15R61 low output

You can slide either or both bands to give you the presently accepted 120V. They affect the field so the output of both legs will be the same within a volt or two.

Glad you found the problem and fixed it. Ain't this place fun!
Reply With Quote
  #16  
Old 01-26-2019, 05:39:42 PM
mrh0t mrh0t is offline
Registered
 
Join Date: Sep 2017
Location: High Springs, Florida
Posts: 10
Thanks: 0
Thanked 1 Time in 1 Post
Default Re: Kohler Electric Plant 15R61 low output

Yes, isn't the internet great!

I'll pull the resistors out and clean all connections when I get time, and reset to 120V.

Thanks to all you Smokstak peeps!
Harry
Reply With Quote
  #17  
Old 01-26-2019, 06:23:57 PM
Zephyr7 Zephyr7 is online now
Registered-III
 
Join Date: Mar 2017
Location: Davisburg, Michigan
Posts: 1,210
Thanks: 313
Thanked 654 Times in 440 Posts
Default Re: Kohler Electric Plant 15R61 low output

Careful when you clean those resistors. Only clean GENTLY and PARALLEL to the resistance wire ó donít rub across it perpendicularly! Resistance wire is very brittle and breaks easily. Ask me how I know...

Bill
Reply With Quote
  #18  
Old 01-28-2019, 05:55:22 PM
mrh0t mrh0t is offline
Registered
 
Join Date: Sep 2017
Location: High Springs, Florida
Posts: 10
Thanks: 0
Thanked 1 Time in 1 Post
Default Re: Kohler Electric Plant 15R61 low output

Thanks Bill. I carefully cleaned the windings with an emory board, yes parallel. I appreciate learning from your mistakes, ha, ha. Harry
Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
Kohler electric plant 2.5 output connection jrsocal Kohler Generators 30 09-18-2017 02:44:04 PM
Kohler 10 kW Electric Plant Vanman Kohler Generators 3 07-04-2015 09:12:46 PM
Kohler electric plant jason tucker Kohler Generators 0 09-08-2008 08:35:30 PM
Kohler 50KW electric plant -no elec. output Iron Mike 395 Kohler Generators 3 04-09-2008 06:42:12 PM
Kohler Electric Plant Mark Bruce Kohler Generators 0 06-10-2003 03:08:08 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 05:34:24 PM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2016 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277