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
Forgot Password? Join Us!

Notices

Generators & Electric Motors General Discussion Antique Generators and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Electric Motors General Discussion

Question about genset on 1950 CAT diesel D315


this thread has 10 replies and has been viewed 5077 times

Reply
 
Thread Tools Display Modes
  #1  
Old 09-13-2010, 02:13:57 PM
oldsdroptop oldsdroptop is offline
Registered-I
 
Join Date: Sep 2010
Location: Cross Hill SC Upstate South Carolina
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Cool Question about genset on 1950 CAT diesel D315

I have just purchased a D315 CAT genset. After spending hours figuring. Out the fuel was about the color of raw sewage from a septc tank. I ended taking a temporary gas tank from a 5 gallon gas can. Now I have the motor going I need to figure out this genset. It has a belt driven exciter on top of the generator. Will I read 110 volts on the leads coming out from the gen? I am using a Fluke 87 multi-meter to check it for power. I am. Reading 3.5 volts at 1200 RPM and 5.5 volts AC at 1800. My question is on a gen of this vintage will I need to have a good load on the gen to get. an accurate reading from this vintage unit? I am pretty new to this. Generator hobby, so I plead ignorance here. I know this is a really old unit and may work differently than what I am used to working with. Thanx for thhelp guys. David.
Reply With Quote
Sponsored Links
  #2  
Old 09-13-2010, 03:49:32 PM
armandh armandh is offline
Sponsor
 
Join Date: Aug 2006
Location: Suburban St. Louis, Missouri
Posts: 3,006
Thanks: 265
Thanked 799 Times in 621 Posts
Default Re: Question about genset on 1950 CAT diesel D315

Quote:
Originally Posted by oldsdroptop View Post
I ended taking a temporary gas tank from a 5 gallon gas can. Now I have the motor going I need to figure out this genset. It has a belt driven exciter on top of the generator. Will I read 110 volts on the leads coming out from the gen? David.
probably not

there should be a name plate on the generator and the belt driven exciter

first the exciter has to put out DC and needs some residual magnetism to get going. may not be any after a long time unused

that then feeds the field of the main AC generator

the name plate may help to determine the output

pictures help
Reply With Quote
  #3  
Old 09-13-2010, 04:22:21 PM
oldsdroptop oldsdroptop is offline
Registered-I
 
Join Date: Sep 2010
Location: Cross Hill SC Upstate South Carolina
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Question about genset on 1950 CAT diesel D315

ok...here are the pics of the unit in question...I'm just trying to establish if I'm doing everything right as far as testing it properly for voltage....the wires inside the exciter are a bit rusty on the screws...(the bottom 2 plates are MIA) so the wires are exposed on the bottom of the exciter. I cannot find any plate on this thing anywhere on the generator or exciter.....I guess 60 years will take it's toll on a unit...it's in really nice shape as you can see...thanx for the help guys I really appreciate it. I love kitty CATS.....David
Attached Thumbnails
Click image for larger version

Name:	gen2.jpg
Views:	500
Size:	79.1 KB
ID:	87314   Click image for larger version

Name:	gen4.jpg
Views:	331
Size:	77.2 KB
ID:	87315   Click image for larger version

Name:	gen1.jpg
Views:	403
Size:	94.1 KB
ID:	87316   Click image for larger version

Name:	gen3.jpg
Views:	295
Size:	79.3 KB
ID:	87317  
Reply With Quote
  #4  
Old 09-13-2010, 07:35:07 PM
Wayne 440 Wayne 440 is offline
Registered-III
 
Join Date: Nov 2004
Location: Kentucky
Posts: 6,592
Thanks: 415
Thanked 5,715 Times in 2,729 Posts
Default Re: Question about genset on 1950 CAT diesel D315

Nice set. Lots of those were made to run at 1200. Be careful about spinning it up to 1800 unless you are sure that is the designed speed.
Reply With Quote
  #5  
Old 09-13-2010, 07:55:34 PM
oldsdroptop oldsdroptop is offline
Registered-I
 
Join Date: Sep 2010
Location: Cross Hill SC Upstate South Carolina
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Question about genset on 1950 CAT diesel D315

Wayne it has a position where a pin drops into that runs it up to 1800....when it's left in low speed its 1200RPM....and when you pull the lever up completely the engine shuts down. The only markings on the gen are the numbers 240 480 (voltage I'm guessing) below that is 2L328 and the third row is 40 RH 20 which if I had to guess deals with Right Hand rotation. These numbers are stamped into the case on the gen on the right hand side of the gen. There are 6 wires that are twisted together with large twistlocks. I was told these are the high power hook ups. I was told the 3 single wires are for the 220 2 hot with 1 nuetral wire.....but again I'm only seeing fractional amounts of power from this gen. I have a feelin its in the exciter assembly. thanx for the help guys. David
Reply With Quote
  #6  
Old 09-13-2010, 08:01:15 PM
BTPost's Avatar
BTPost BTPost is offline
Moderator
 
Join Date: Jan 2005
Location: Excursion Inlet, Alaska USA 99850-0090
Posts: 4,822
Thanks: 552
Thanked 1,833 Times in 1,197 Posts
Images: 1
Talking Re: Question about genset on 1950 CAT diesel D315

Take those numbers, and call your local CAT Distributer, talk to the Parts Guy, and he should be able to look them up in the CAT Build List, and give you all the Genend Info, about that specific Unit.
__________________
Bruce in alaska
Reply With Quote
  #7  
Old 09-14-2010, 12:11:40 AM
Jim Rankin Jim Rankin is offline
Registered-III
 
Join Date: Nov 2004
Location: Faunsdale, Alabama USA
Posts: 4,436
Thanks: 71
Thanked 1,185 Times in 967 Posts
Default Re: Question about genset on 1950 CAT diesel D315

I never had any luck with CAT unless you can give them a serial number off the machine. I have a slightly newer one than that with what looks like a CAT part number just like your 2L328 stamped into it, but no help from CAT without an arrangement number or serial number.

Sounds like you have 9 leads out of the generator housing. Pretty typical for an old CAT set. Most of them had 3 phase Y connected generator ends like yours. You mentioned there were 6 leads with twistlocks on them? If they are in pairs, (connecting 2 leads each time), then your generator is likely connected in series Y for the 460 volts 3 phase, not single phase. The only thing you don't mention that should be there is a neutral (sometimes marked L0 or T10).

DO NOT DISCONNECT ANY LEADS unless you see that they are numbered with ledgible numbers! The way they are connected is good information to have if you don't have any numbers on them. You will likely be able to use 2 lines and the neutral to get 120/208 single phase out of the generator for 2/3 of the full 3phase rating (which you don't have I guess). I would guess about 40 kW or so on a D315 at 1800 rpm.

You need to ensure that the brushes of both the exciter and the main generator rotor are free to move up and down in the guides and that the commutator surface of the exciter and the sliprings of the main rotor are clean. Do not have to be shiny, black discoloration is normal, but cannot be corroded, rough etc. If needed, fine grade sandpaper can be held against those surfaces to dress them while the generator is spinning over. Special stones are made for that purpose and are a lot easier to use than the sandpaper.

If it still won't build up after cleaning and checking the brushes, the most likely problem is that it has lost too much of the magnetic field that stays in the iron between runs. This residual field creates enough "residual" voltage to allow the generator to build up to full regulated voltage. To restore the residual, apply DC voltage from a small battery like a lantern battery or very carefully from a 6 or 12 volt starting battery to the brush leads of the exciter or the main generator. You need to determine the correct polarity (matching + and -) and just touch the wires from the battery to the leads for a second and see if voltage builds up. Best to have a volt meter connected and measureing voltage while you're flashing the field so you can see what it does.

BE CAREFUL! It is supposed to make voltage and may unexpectedly do so at any time. Somehow a generator doesn't seem as dangerous as utility power, especially a "dead" generator, but still be very cautious. Even the DC power from the exciter running down to the brushes on the main rotor is dangerous.
Reply With Quote
  #8  
Old 09-14-2010, 09:00:05 AM
Jim Rankin Jim Rankin is offline
Registered-III
 
Join Date: Nov 2004
Location: Faunsdale, Alabama USA
Posts: 4,436
Thanks: 71
Thanked 1,185 Times in 967 Posts
Default Re: Question about genset on 1950 CAT diesel D315

I forgot to say that there is supposed to be a serial number plate riveted onto the engine block above the starter on the governor side of the engine. Look just below the head gasket line for a small tag about 2" x 1" held on by two drive rivets. If it's not there any longer, the number was normally stamped into the block before the tag is put on, so clean carefully between the two rivet holes.

When you call CAT for parts, you want the oldest guy there! Lots of the younger ones "don't know how" to go into the microfiche system that most dealerships use for the old equipment parts books. If it ain't in the computer, they aren't interested. CAT has a website where they have reprint manuals etc for their old equipment. I would look through the "engines/power units" section.
http://www.cat.com/cda/layout?m=90800&x=7

If flashing it doesn't get it going, a lot of the old ones have build-up relays on them and there are various other components in the regulator cabinet that could be defective, maybe some fuses in there that could be blown etc. The bolt-on cover on the side of the box on top of the generator should get you into it. The same advice as the output leads applies here........don't disconnect anything without first marking it so you can put it back.

One thing you can do to check the basic health of the generator is to read the voltage on all combinations of the 3 leads and perhaps each lead to the frame of the generator or more appropriately the neutral lead. Even the residual voltage should be equal between each pair of lines A-B, B-C, A-C and A-N, B-N, C-N. The Line-N voltages should be about 57% of the L-L voltages if everything is alright inside.

You do not have a single phase generator with that many leads and stamped 230/460.
Reply With Quote
  #9  
Old 12-24-2018, 06:39:54 PM
Nick cox Nick cox is offline
Registered
 
Join Date: Dec 2018
Location: Midlands Staffordshire, United Kingdom
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Question about genset on 1950 CAT diesel D315

Hello i have one of these sets before you do any testing read the plates on the side of the gen set for volts and amps also the phase this set may be 3phase at 230 v a phase 80amps a phase too also read the engine plate on the inlet side under the manifold this will tell you engine hi idle speed that will possable be 1200rpm that will give you the max speed to drive the unit if thats the correct rpm it was made for some sets are higher this is inportant to find out before you do any setting and testing from the past sets i have worked on U S navy is 230v at 60 herts at 1200 rpm these sets are very good at the day built was top spec very reliable
Reply With Quote
  #10  
Old 12-24-2018, 08:29:15 PM
RETCPO RETCPO is offline
Registered-II
 
Join Date: Sep 2010
Location: Hampton, VA USA
Posts: 651
Thanks: 241
Thanked 513 Times in 276 Posts
Default Re: Question about genset on 1950 CAT diesel D315

Nick,
This thread is over eight (8) years old...
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
3-71 GM Diesel GenSet Roger Boardman Generators & Electric Motors General Discussion 13 07-11-2008 09:48:43 PM
Help ID Onan Diesel genset Jim Boomer Onan Generators 14 06-30-2008 02:11:27 PM
Anybody ID this Diesel Genset BTPost Generators & Electric Motors General Discussion 3 12-20-2005 04:13:25 AM
1980's 4 cyl 12.5kw diesel genset Deng43 Kohler Generators 12 10-19-2005 03:43:51 AM
3KW diesel Genset, Onan Rb Hawaii Onan Generators 0 07-01-2003 01:55:32 AM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 12:55:58 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