Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

Setting engine speed on generator


i6pwr's Avatar
Member

Join Date: Feb 2009
Posts: 323
VA

02-12-09, 07:51 PM   #1  
Setting engine speed on generator

Powermate 5000 w/ the Subaru EX30, what is the best way to set no-load RPM?

I have a non-contact tach and a DMM that reads Hz.

Should I adjust for a set RPM or voltage?
I know the governor should keep the RPM's in check under load, but how much do these things deviate when under load? Should I adjust for about 130V @ no-load or just for 60Hz?

How detrimental is the cycles over the volts, meaning will appliances work more poorly on low voltage or Hz?

I would assume 3600 RPM would be the target correct?
Reason I ask is I tested it out with my Fein vac and a radial arm saw hooked together and the saw would not get up to speed, remove the vac and it did however I didn't test the voltage when this occured but will this weekend.

 
Sponsored Links
cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,574
GA

02-13-09, 10:42 PM   #2  
3600 should get you 60 hz. and the correct voltage at the receptacle as far as I know. The way I understand it, 1 revolution of the armature per second equals 1 hz, so 60 per second equals 60hz, times 60 (seconds in a minute) and you get 3600 revolutions in a minute (rpm). I'd say if you have that and close to 120 volts, then I think I'd be satisfied. There may be someone more qualified than I am to add to this, so check back.


"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

 
Airman's Avatar
Member

Join Date: Feb 2008
Posts: 755
TN

02-14-09, 06:37 AM   #3  
With no electrical loads connected to the generator (“no-load” condition). Set engine at approximately 3720 RPM. Setting the no-load speed slightly high helps prevent excessive RPM and frequency “droop,” when heavy electrical loads are applied.

Meter should read about 61.5-63.5 Hertz (3690-3810 RPM) and with load applied it will settle down to approximately 3600 RPM and 60 Hertz.

 
i6pwr's Avatar
Member

Join Date: Feb 2009
Posts: 323
VA

03-01-09, 09:42 AM   #4  
Update on progress.....

Would have done this sooner but my PC had a nasty virus and I had to replace hardware

I set the no-load idle to 3720 RPM, voltage at 3720 is 125V. Loaded with a Fein vac and voltage was now at 118 @ 3690 RPM. Tried to turn the radial saw on again and it would spin but not spool up, voltage dropped to 90V and RPM was 3650. Stayed like this until I turned the saw off but would not fully spool up.

Any ideas on what this may be? Brush surface is clean (ring), brush lenght is about 5/8-11/16" out from the socket. Capacitor measures correct farad.

 
hopkinsr2's Avatar
Member

Join Date: Feb 2005
Posts: 1,561
Non-US

03-01-09, 01:22 PM   #5  
I have a 3500 Yanmar that will run my air compressor. I have had several 5000 watt colemans in here for service & they will not. I'm kinda thinking the Coleman are overrated, especially when starting a heavy load. Maybe someone more familliar with generators can let us know more about these... Roger

 
Search this Thread