Question about Electrical Supplies
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Posted on Jan 02, 2017
To flash fields the genset has to have rings and brushes. The ring towards the bearing or towards you is positive and the back ring is negative. The rings and brushes are on the rotor, which is the part that spins on the generator end. Place a volt meter on the outlet, start the genset, with a 12V battery apply the positive to the front ring and the negative to the back ring. The voltage should climb up to about 50 - 100Volts or more. If this happens then you will need a Voltage regulator. If voltage does not climb up, then check the rings and brushes. Make sure the brushes have a good length and that they touch the rings and make sure the rings have a shiny copper color to them, if they're black clean them with emory cloth until there is a nice copper color and try flashing the gen again. If nothing happens then you need a new generator end or new generator, which ever you prefer. Make sure to use rubber gloves when flashing and look out for rotating parts.
Posted on May 20, 2009
First check with the
dealer and see if it is still under warranty. If it is not, make sure nothing
is blocking the air flow around where the control modules are located. This
could cause the voltage regulator and other electronic parts to overheat. Next
check the brushes and make sure they are free of any dust or build up preventing
them from making contact.
If everything is OK the next thing I would do is change the voltage regulator.
Posted on Nov 25, 2009
Those voltage readings MAY be normal.
The AC waveform may cause your meter to read inaccurately. You would need to use a TRUE RMS meter to accurately read the voltage.
The siple meters actually read the AVERAGE voltage and then are calibrated to mulltiply it by the "form factor" for a sine wave. OFTEN these generators don't produce a clean sine wave. A square-ish wave will read higher on the garden variety meters.
Compare the brightness of a lamp comparing to when run on your utility.
The frequency depends on engine speed ... yours is running a bit fast...check it under at least half load and if off, adjust the govenor slightly.
Posted on May 02, 2010
Testimonial: "Still working on the problem but tips were a real help."
Hi and welcome to FixYa, I am Kelly.
Without a model number... I am guessing about what type / brand and MODEL of generator you have. I have to assume it is a Coleman Power mate.
Try flashing the field. Do this.. take and electric drill and plug into the outlets of the generator. Turn on the output power GENERATOR ON. Squeeze the drill trigger and rotate the chuck as fast as you can. This will induce voltage into the stator and they usually will start producing power. When it does produce power it will try to yank the drill chuck head out of your hand so keep that in mind.
If the above does not work...
Remove the small cover from the center of the endbell. It covers the end of the rotor shaft and has 2 brushes under the cover.
INSPECT the brushes visually (do not remove them yet)
Use a meter to read resistance by probing the electrical contacts of the brushes. You MUST read LOW resistance. This is the rotor winding.
No resistance or high resistance
Remove the brushes inspect for damage. Try to probe the slip rings of the rotor. (You might have to make a 14/2 Romex electiral wire extension to get some solid copper wires to touch the rotor slip rings) Again you must read LOW reistance.
If you have low resistance and the brushes are good.....
Reinstall the brushes. (TEST for AC) Start generator
STILL NO OUTPUT?!!!!
Use a meter on DC to read AVR voltage output to the brushes by probing the brush terminals. You should read 3 - 7 VDC. No voltage.... hmmmm Possibly an AVR problem but...
Rig up a 9 Volt battery that you TAPE the wires to the battery terminals and the case of the battery
Just loosely connect the 2 wires to the brushes. Wrap the battery with a rag it might explode if you don't remove it fast enough. Your going to yank this off as soon as it produces power QUICKLY.
Plug in a light or a small fan so you can see that power is being produced. Let it run a few minutes before shutting it down.
To do anything else I need to know your generator model number to do winding and voltage regulator checks.
Thanks for choosing FixYa,
Posted on Aug 30, 2011
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