adjusting dc voltage

Submitted: Wednesday, May 11, 2005 at 17:11
ThreadID: 22900 Views:2267 Replies:3 FollowUps:3
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Does anyone know how to adjust the dc output voltage on a Millers Fall generator
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Reply By: kev.h - Wednesday, May 11, 2005 at 17:49

Wednesday, May 11, 2005 at 17:49
Very easy you will need a meter which can read to 10 amps DC @ 12V( fairly common except for the real cheapies )
start the generator and hook the meter between the positive terminal of the battery and the generator positive lead, hook the neg. lead from the generator to the battery as normal the battery is best half charged as a full battery will not accept a charge as easily (and you never charge a full battery anyway).
now take an amp reading about 5-6 amps is ok but if only 1.5-2 amps as i've found most are off the shelf adjust as follows
Locate the throttle screw on the side of the carby ( this screw operates the butterfly in the carby and should operate on a cam type arrangement with spring return) it is located in the space between the fuel tap and main motor housing approx 60 -70 mm in you may have 2 screws to pick from it is usually the one closest the motor(but there are a few different types)adjust this screw in until the amps come upto 5 - 6 this is ok if you go much higher you will start to affect the 240v frequercy no real problem as you should not be running frequercy sensitive equipment off this typy of generator anyway
I think the factory set the 240 frequence and dont worry about the 12v because they vary a lot
best of luck Kev
ps if you need more just ask.
AnswerID: 110860

Follow Up By: thomjor - Thursday, May 12, 2005 at 08:04

Thursday, May 12, 2005 at 08:04
Thanks Kev
What we are trying to do is adjust the voltage not the amps. Any clues with this.
FollowupID: 367361

Reply By: darcla - Thursday, May 12, 2005 at 20:58

Thursday, May 12, 2005 at 20:58
Hi , you will find open circuit voltage will go up well over 20 volts , but when hooked up to battery will be in the range of 13.8 to 15 volts which is acceptable .

Cheers Bungarra
AnswerID: 111079

Follow Up By: thomjor - Friday, May 13, 2005 at 09:14

Friday, May 13, 2005 at 09:14
Thanks ,ours is sitting around 15volts on a half flat battery & we were a bit concerned that it may be too high
FollowupID: 367560

Reply By: kev.h - Friday, May 13, 2005 at 20:21

Friday, May 13, 2005 at 20:21
Hi Thomjor
sorry took off on the wrong tack. On yours the voltage will be set at 14.4volts for battery charging and is generally not adjustable ( there is also a 12.8 volt unit sold as a lighting plant - not too good as battery charger) as stated above i would check your amps as i find them to be low. Also if running any 12 v equipment with your generator always use a battery in the circuit otherwise you will have no voltage regulation and may get 20+ volts depending on the load
cheers Kev
AnswerID: 111223

Follow Up By: thomjor - Saturday, May 14, 2005 at 08:08

Saturday, May 14, 2005 at 08:08
We were intending to use a battery in cicuit but thought 15 was a little too high but apparently not. We'll see how it goes Thanks
FollowupID: 367630

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