Powermate 6250 model pm0545007.01 engine runs no a.c. output
Service tech said check brushes did that they are fine .tech said connect battery cable to negative on left and just touch posative cable to right side posative it produced juice for one second then quit tried it ten more times still nothing
Re: powermate 6250 model pm0545007.01 engine runs no a.c....
You will need to install new diodes,they are located in the plastic housing behind the receptacles...It looks like little spark plugs..They work to put dc voltage to the rotor,without the exciter voltage applied,you will not get ac power out..The part number is 3483.01....You can buy these online for about $6 each,they have 2 inside the generator,and you should change both.
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If the unit is equipped with a voltage regulator or a bridge
rectifier, flash the field as follows:
• Obtain a 12VDC battery.
• Get two jumper leads that can go from the battery to
the brushes (wires with alligator clips work well).
• Find the brushes inside the alternator portion of the
• Start the engine and get it up to running speed.
• Connect the battery positive (+), to the positive brush,
which will be the brush closest to the rotor bearing.
• Connect the battery negative (-), to the negative brush,
which is the brush farthest away from the rotor
• After about five seconds, disconnect the battery wires
from the brushes and check for proper (AC) output
• Shut the engine down. Restart the unit and check once
again for proper (AC) output voltage.
I have the same problem and here is my troubleshooting steps I took.
1) Verified that the unit had no output with induction meter on cables coming out of top of generator head (three black and three white).You can use a volt meter too.
2) Checked that brushes were free and long enough.
3) Checked capacitor (condenser) was 130uF
4) Checked diodes
most generators you can polarize the brushs this is done by using a 12v. battery and a set of jumper cables hook to the battery and touch the brushs with the other ends it doesn't matter whicht side, but before you do all that check the connections at the brushs and see if they are loose or not making a good contact, i do hope that i was able to help you, thank you.
check your beakers, be careful but you may want to flash the sys. if you have a brush sys, on the back you should have a cover that pops out. left is hot right is ground. take a 9 or 12 vol battery (lawn mower battery). take the wires from battery to gen set and flash it for one second with the unit running at full throttle. if not a brush unit us a plug type wire and plug it in to the 120 vol receptacle for one second. than check to see if you have power. if not repeat but hold for 2 to 3 second. again check power out put. if none take to a shop
This sound like a loss of residual magnetism in the generator. The field will need to be "flashed".This is also known as re-exciting the field of the generator. The Coleman manual gives these steps: 1Use a 6 Volt lantern batters (dry cell) or a 12 Volt automotive battery. 2.Disconnect all loads from generator. 3. Remove the brush cover (that's the rectangular plastic cover on the end of the generator.) 4. Plug a lamp or light into the generator before starting the engine. The light will illuminlate when ?Voltage has returned. 5. Start the engine with no load connected to the generator. 6. Attach the "-" lead of the battery to the negative brush. Very briefly touch the "+" lead of the battery to the positive brush. Remove as soon as Voltage builds up.
Take the cover off and flash the rotor again with a 12 volt battery. Positive lead goes to the top or right side brush. Negative to the other brush. Just touch it on, then remove it, and check for power at plugs. If that doesn't do it, change the AVR (voltage regulator)
Try this! To excite it. Shut off the generator! Unplug everything,Then use the 12 volt battery to excite it per manual. Make sure the engine is NOT running and the breaker switch is in the on position. Now with the battery 12V removed restart the generator! This should fix it if the problem is that it lost its magnetism.
Remove front cover on the genset and you will see the brushes and rings. Clean the rings if black with emory cloth and inspect brushes. Flash the fields by apply a 12V battery to the brushes. the brush closest to you or the bearing is connected to the positive side of battery and the back brush is negative. You have to do this with genset running. You should notice your voltage climb up to over 50Vac maybe even over 100Vac. Make sure to use rubber gloves when flashing fields and keep hands away from rotating parts. if voltage does increase when flashing the the voltage regulator is shot. If voltage does not climb then you will need a new genset or generator end.
I'm not for sure what your asking, but i'll try. I believe your saying you have no a/c out. In the middle of your end plate on the generator there is a little removable cover. Remove it and it will expose your brush connections. Ohm across those terminals. Your meter should read around 10 ohms give or take a little I don't have a chart in front of me. If you get OL(no resistance) your circuit is open either at your brushes or your rotor. If you get a high reading in ohms 80ohm or 50k your problem is the brushes dirty worn out. If that's ok check the capacitor test to its rated farad. Then check the two diodes in the end plate. remember to swap you meter leads around to check both the resistance and gate. The only thing left is the stator and there should be almost no resistance through each winding and not correction to ground. Remember to isolate each circuit as you test or you'll get fails readings. I would also check resistance though every wire and connection. Also if you have replaced parts or have not used the unit in a while once it is back together take a 9 volt battery and touch it to the brush terminals with the correct polarity just for a second to bring back residual magnetism. I believe the out side slip ring is negative. If it dosn't try it the other way it will not hurt anything.
I had the same problem on my Powermate 525500 (5500 watt) and finally manage to get in contact w/Powermate (PRAMAC) tech support. He told me that if the gen is setup for a while, the exciter loses it's magnatism. To reenergize ( jumpstart) as he called it, follow the prcedure below. Probably not for amatures.
1. start up the generator.
2. Pull off the brush cover on the end of the gen.
3. Get a 6-12 volt battery and setup w/color coated cables.
4. place the negative lead on the left side brush terminal and tap the right side brush terminal w/ the positive lead.
5. Wala....you sould have power.
One would think that this important info would be on the manual or a blog somewhere.