Question about Yamaha Power Generators

3 Answers

Low voltage Voltage is about 98v with no load. It will increase if I advance engine speed by hand. When I put it under load, voltage drops but engine speed doesn't increase. Again, if I increase engine speed by hand, voltage will rise.

Posted by on

3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Welcome.
I am the owner of the generator YAMAHA EF 600. During the last exit on the nature of the generator produces a higher voltage. Instead of 220 volts produces 450 I have spoiled all the light bulbs in the lamps.
Changed item12 7H5-87105-01-00 RECTIFIER ASSEMBLY . It did not help.
Please help to solve this problem

Posted on Sep 26, 2014

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

I have a brand new Nothernstar belt driven generator, I set the engine speed with no load to produce 61.5Hrz but the voltage remains low at 103VAC. When I switch on some load (an AC Unit) the frequency drops to 60.5Hrz but the voltage stays at 103 VAC.

Posted on Jul 19, 2013

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Yamaha Master
  • 1,378 Answers

Most generators use a flyball type governor within the engine to control rpm; also there is a voltage regulator that tries to maintain voltage at about 115v. The voltage regulator varies the voltage to the armature increasing /adjusting magnetic force. Use a meter with htz or freq setting to adjust engine governor to 60 cycles. When the generator is producing 60 cycles, the engine should be turning 3600 rpm, max power range. At 3600 rpm the voltage should be 115 to 120 volts. Loading the generator will cause governor to try to maintain 3600 rpm. Check engine manual for proper adjustment of gonvernor and linkage. The governor mech should last the life of the engine, however governor system does wear out. Expensive repair. enjoy

Posted on Nov 30, 2008

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Generator electrical problem


No it sounds like the engine is losing power, as the RPM drops the voltage drops, this increases the current load and that trips the breaker.

Jul 21, 2016 | Power Generators

1 Answer

Old Honda eb1500x is putting out low voltage but engine seems to run fine. Ideas for testing and fix?


Couldn't find anything on that model number other a control box.

Assuming your in the USA output frequency would 60 hertz under load so 65 hertz would be find; although, engine is running close to 3900 rpm when it should be around 3750 rpm unloaded which would be 62.5 hertz. As the output voltage being low it is probably the AVR (automatic voltage regulator) that is the problem.

May 28, 2015 | Honda Power Generators

1 Answer

Why is my honda generator puting out 126 volts?


Is it putting out that voltage with or without load? Speed will influence these units, depending on the model the capacitor regualtor in the back end of the alternator is subject to this error. If you have an AVR then it mayeb adjustable depends on the unti you have. Try measuring engine rpm to be sure it is withing specs first. That is not so high a voltage as it can be 10% of nominal. I am sure it drops down under 1/2 load, then all is ok

Nov 04, 2013 | Power Generators

1 Answer

My generator only puts out 89 volts.


I need a model number for your ENGINE not the whole generator. I believe this is a case of the engine not running fast enough. I.e governor adjustment will be necessary. Respond with an Engine model number and I will stll you how to adjust the governor speed.

This is GENERIC but the Governor arm has a spring that connects to a speed plate. The speed plate has a stand off screw and nut used for speed adjustment and a center nut for securing the speed plate in a fixed position. The Steps are to slightly loosen the center nut and the locking nut on the speed adjustment screw. Start the unit with a meter reading output power voltage (use extension wire for meter) Then turn the speed increase screw in to increase speed. When you reach 122-123 VAC stop. The reason you adjust it to 122-123 VAC is because voltage will drop as the generator provides power loads
Tighten the screw lock nut while running if possible and tighten the center nut on the speed plate to secure it in place. Check voltage again.

If you generator is running at normal speed and you have low voltage output... most of the time the Capacitor is failing. If the capacitor is failing the magnetic field in the armature and stator collapse under above average loads causing HUGE voltage swings.

Thanks for choosing FixYa,
Kelly

Aug 29, 2011 | Briggs & Stratton Power Generators

1 Answer

Hello, my Briggs & Stratton generator, PP5000, Intec, 8 hp, Model 202412, type 0167E1, has lower power output, 180 Volts in stead of 220-230 Volts. Any idea where I should look ? Engine is 8 years...


Hi and welcome to FixYa. I am Kelly

Usually when you have a lower voltage output that is yet above 150 VAC the problem is as simple as the engine is no longer running at full speed. This could be caused by binding carb or governor linkages but more often than not the Governor adjustment screw has backed off over time causing the engine to gradually slow so the output voltage drops. The user does not notice it so much until the output drops more than 15% and you notice dim lights... slower running equipment etc.

Look for a circular plate / governor speed plate near the base of the governor lever but off to one side that has a spring that attaches to the governor lower end of the governor. There should be a screw with a locking nut. Loosen the nut and turn the adjusting screw clockwise to increase engine speed. (You may have to barely loosen the pivot nut on the governor speed control adjustment plate to make the speed adjustment.... tighten when done with speed adjusment) Watch your output voltage and adjust the voltage to 225 VAC with NO LOAD. The voltage will drop as loads are added. Make sure to tighten the lock nut on the adjusting screw or in a matter of an hour you will have low voltage again from engine speed dropping. What ever you do.... DO NOT adjust the governor arm base attach point where it attaches to the engine.

Just so you know a weakened governor spring can cause the speed drop also. If the speed keeps dropping with extended use, you may have to change the spring that goes from the lower end of the governor arm to the governor speed adjustment plate.

Thanks for choosing FixYa,
Kelly

Apr 20, 2011 | Briggs & Stratton 3,250 Watt 6.5 Hp...

1 Answer

I have a coleman 6000. It runs for a whileand when I load it up it trips off.


Make sure the governor is working properly. When you put a load on it the engine should increase in speed slightly. Make sure the engine is running at the correct speed 3600 rpm. Try plugging in an item that draws less power such as a electric drill and see how the generator behaves. Also make sure the engine runs smooth while not under any load. Check the voltage from the outlet to make sure it is putting out 132 volts not under load.

Mar 14, 2011 | Coleman Powermate Proforce 6,000 Watt 12...

1 Answer

7 hp brigs engine on my generator runs two fast producing 127 volts. how do I slow it down?


Hi and welcome to FixYa. I am Kelly. Since you did not mention the make or model number of your generator I will respond in generic terms. If your generator is at 127 volts with NO load it is adjust at the very top end of the manufacturers limits. There is a 10% tolerance so 120 VAC + 12 is 127 VAC. Under an electrical load above 500 watts the generator should drop the output voltage slightly so your generator would still be within factory limits. Personally on any generator as a repair person; I set the output voltage at 126 VAC no load so that when the user puts the generator to work the output voltage is good. If your generator is running at 127 VAC under load then you can adjust the governor screw on the governor plate CCW about 1/2 turn to drop the voltage. Without a generator model number or engine number I can not tell you exactly where the governor plate is on your engine / generator. The screw will have a lock nut that you must loosen 1/4 turn then turn the adjustment screw CCW to drop the voltage. Just make sure to re-tighten the lock nut when the adjustments are complete. Mind you by decreasing the output voltage you also drop the output freqency at the same time you decrease the output voltage. It is better to have 125 -127 VAC under a no load condition as the more electrical load you add the more voltage drop you will notice. It is best to adjust the generator to 122.5 -123 VAC under a medium load. (50% of output capacity) A bread toaster is 1400 - 1600 watts and is a good load for a 3000 watt generator. Also a good hand held hair dryer will use around 1600 watts. If you use this type of load and the voltage output is 122.5 to 123 VAC I would not adjust anything. I have been working on generators since 1970 so this is nothing new for me. I hope that you understand everything I posted. If not, feel free to ask as many questions as you wish in any future response.
Thanks for choosing FixYa,
Kelly

Jan 08, 2011 | Craftsman Power Generators

2 Answers

I have a Coleman Powermate Pulse 1750 generator. The engine runs fine but lately I've noticed I'm only getting approx. 105 volts. Any suggestions.


Engine speed is low, does your meter read frequency? Set for 60 Hz @ speed. I doubt there is a voltage regulator adjustment. This may help

Jun 25, 2009 | Coleman Powermate Premium Plus 6250W...

1 Answer

Three year old coleman 5000/6250 generator. High


Your RPM's are too high. There is no voltage regulator in coleman generators (generator is actually made by generac) and is 100% dependent on engine speed. There is a screw under the tank when your looking in from the recoil side. It controls the governor arm. Screw it in and it incresses the rpm, out decrease. Plug something in that draws a decent load while setting the rpms since you want it to put out 120 and 240 underload. Your idle voltage does not matter.

Apr 01, 2009 | Coleman Powermate Powermate 5000W...

2 Answers

Porter Cable 5500w generator (10hp BS) will not regulate speed.


While attending college I worked at a tool rental center and learned a great deal about matching generators to customer requirements and troubleshooting customer owned units. There are simple tests that you can perform, however, first some info on what to expect from a generator. Most generators are overrated and under powered. You should only expect to get about 60 - 75% of rating. Example, a commercial honda 5000w generator has an 11hp motor that can only produce about 9.5 hp at 3600 rpm. If a customer needed 5000w of power, we would rent them an 8000w generator because as the generator is loaded to max the voltage will drop. You generator will probably only provide steady voltage ex. 115v at 60 cycles to about 3500w then voltage will begin to drop. New generators have automatic voltage regulator that varies the power to the armature increasing/decreasing the power of the magnet. These voltage regulators suffer a high failure rate and are expensive. If your generator is not giving you 3500 watt at 115v 60 cycles your engine may have a few problems and your power generator end may need tweaking. (I would not expect to achieve 5500w at 115v with briggs 10hp) .
The governor is about 2 inches in diameter and turns off the cam gear inside the engine. It is flyball type with two or three small arms that react to rpm. The faster the engine turns, more force is applied to the governor arm to reduce engine speed. Easy to test, with engine running use finger pressure against the arm to increase speed and you should feel a greater resistance as the engine speed increases. Another simple test, remove air filter to expose butterfly inside the carb. Move the governor arm and check that the butterfly opens fully. If it does not open fully linkage and governor is not set correctly. Next, start engine and load generator up to max and check that butterfly opens to full as the load increases. When the butterfly opens all the way under load the engine is at max. Add up the wattage of all the tools/appliances you used to load the engine to get an idea of max load . Lets assume that the shop adjusted the governor properly, if the governor was not working the engine would over rev. and damage would occur. As you were told the governor spring controls speed and can be adjusted somewhat by bending tab or adjustment screw. But a review of your generator manual or that series of briggs engine will show that there are several governor springs available and different placement holes on the governor arm to attach the spring that will change the power curve. Pulling on the spring can only do so much, however changing the spring to different gauge /turns/material or differnet location on the governor arm will cause the engine to perform differently. These springs are sold thru briggs dealers by part number for your engine. This would be considered tweaking to get a different power curve.
Now for the generator. Some generators have a capacitor incorporated in the windings. This capacitor must measure within 95% of rating. Remove from circuit for testing. Finally look very carefully at the commutator rings for any evidence of brush bounce. If the brushes do not perfectly seat you will lose power. If your generator is brushless you can only hope that the diodes are within spec. because it is too difficult to test them. They also must be removed to test. Finally if your generator has an automatic voltage regulator the only test would be to replace with a known good part. At the rental center we stocked spare parts so that we could quickly find fault. There is soo much to learn and the life too short. I hope this helps good luck, please email your questions.

Dec 24, 2008 | Coleman Powermate Premium Plus 6250W...

Not finding what you are looking for?
Power Generators Logo

Related Topics:

1,142 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Power Generators Experts

John Trevino

Level 3 Expert

1378 Answers

Roland W VanLue
Roland W VanLue

Level 3 Expert

375 Answers

Dwain Pippen

Level 3 Expert

376 Answers

Are you a Yamaha Power Generator Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...