Question about Electrical Supplies
Check brush terminals with volt meter without the AVR connected. Shows only 53 volts
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: i get no 110 or 220 volt power
generac was purchased by Briggs Stratton some years ago, however some information is available at the following web address, just enter your model number:
The small board that you describe is the bridge rectifier that converts ac from the windings to dc for the armature. You can test the brush/board by removing the part from the generator and applying 12 to 16 volts ac to the input tabs/wires then test/read dc (dc voltage will be lower than input ) voltage at the brushes. Use meter to make sure that you are getting dc. I use a small power supply less than one amp that I purchased at the thrift store for a couple of dollars. If test fails replace part. If it tests ok re-install brushes and re-connect the ac power supply to brush/board which in turn will energize the armature. At this point test the armatrue for magnetic power. I use a thin welding rod or wire against armature. If you feel a magnet start the engine. If the windings are good you should get some voltage at the plugs and the two wires that feed the brushes (will not be full voltage). If voltage is present, kill engine and disconnect ac power supply and connect the original wires to brushes/board and start engine. If you now have voltage at plugs you spiked the system indirectly by energising the armature. If still no voltage you may have an open circuit that feeds the brushes or diode pack is failing with the incresased voltage. Good luck with your repair and email if you have questions.
Posted on Apr 14, 2009
The best thing to do at this point is to flash the fields. You do this by applying battery voltage (12Vdc) or 6Vdc to the wire that come from the brushes. The brush closest to the bearing is Positive and the brush near the rotor winding is Negative. While the generator is running apply battery voltage to the correct spots on the brushes. You should see an increase in voltage. If you do see an increase, then you will need that little board with diodes, that is your voltage regulator. Use rubber gloves when performing this procedure and stay away from rotating parts.
Posted on May 08, 2009
Check the voltage with a meter in all the recepticles with your meter leads in the left and right slots on the plugs. Is that 184 volts AC there? If so, your gen has big problems with the voltage regulator. Let me know what you read. You can check the right slot of each plug to the round ground hole on the plug too, should be 120 volts there.
Posted on Jul 02, 2009
Make sure it is not the brush set.
There must be continuity from one slip ring to another.
If not, but rotor doesn't look burnt - check points where rotor wire is soldered to slip rings, or clear contact point on each side of wire and check continuity there, past slip rings and brushes. Big chance that wire came loose from slip ring.
Had such problem on my Champiion 3500
evern if burnt - rotor is easy to rewind at home, unlike stator.
Unless your model is Inverter type - there is AVR module.
But, unless your rotor has continuity - don't bother going further.
Posted on Jan 13, 2010
Hello, seeing how this is a new generator, I would have the company either replace the unit or have a certified tech (factory) set the voltage. My first check would be that the voltage regulator is not functioning, or is set incorrectly. I have worked on generac for 30 years. My suggestions are because of warranty issues. You might void your warranty if you try to set the voltage. Just curious, when you discovered this, was there a load connected? Also, I would make sure by checking line voltage with my multimeter to verify it is functioning properly. Sometimes a Digital Meter can give false readings. Do not put a load on the generator, I would connect a 100w light bulb to a phase - neutral connection as not to damage household equipment. Please feel free to contact again if there are more questions.
Posted on Jan 15, 2011
Testimonial: "Thanks for the info. Joe, it confirms what I already suspected. I have called in a certified generac technician because of the warranty issue. "
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