Powermate Pmo542000 Manual
If the rotating rotor diodes are shorting, usually a overload, high current causes them to short. If the diodes are shorting, I would stop replacing them, try to find some specs on the resistance of the stator windings, do a thourgh ohms test of the stator first then the rotor. If you do not see anything wrong with either the stotor or rotor you may have to get a electric motor shop to meg both. Really helps to have the specs and a electrical schematic when you go to the motor shop. A shorted or overloaded stator (stationery windings) main AC winding is what I would suspect, most likely shorted windings. If the unit has a Capacator associated with the stator windings, (most brushless generator have such) make sure it's not shorted!
You do have kinda a unusal problem. Have you tried to get any Service diagrams or support info from Pramac America??? (the current owner of Coleman) I got some good SERVICE diagrams from them awhile back, including electrical diagrams with specs of the stator and rotor resistance, etc) Can you post a electrical diagram of the unit or a link for reviewing such?? They were opened. We have tested the windings with a ohm meter and they all seem to check out ok. I have pulled the field coils and found no sign of contact with the rotor.
This all started when I inadvertenly shorted the 115v plug for a moment. It did not blow the breaker but the motor ran as if there was no load on it and the voltage had droped to almost nothing. I could not find anything wrong so I put together the 3 light exciter device and excited the generator. It laaded the motor for about 2 minutes and I was able to run a drill. Then the motor went unloaded again and the voltage went with it.
This time I found the exciter capacitor melted. I replaced it with 2 parallell capacitors and the symptons did not change. I then tested the diodes and found them open. I replaced them and started the generator again. I checked the diodes again and they were open.
I checked my parallel capacitors and found them to seem shorted. I have ordered another capacitor SJE D011 7.5 UF AC 350 v. I will find some new diodes on Monday. I will put it all together to see if all these parts go south on me. Or is there something else I can check to be sure there is not a intermittent open?
Thank you for your help. Paul - Post added at 08:21 AM - Previous post was at 08:18 AM - Arki, We did meg all coils and found no problems.
What if the diodes are open? Thank you Paul. I've been in electrical and electronics for several years and have NEVER seen a silcon diode open UNLESS it shorted first then fried to the point that it burned open and this would be readily visible with a burned epoxy case.
By shorted, I mean than when a diode read by a ohmmeter the forward and reverse reading are approximately the same. (may not be a dead zero resistance short, just no difference in the front to back ratio readings) You need to do the correct capacitor replacement.
Coleman Powermate Pmo542000 Generator Spring
The original cap is a oil filled running type although this may not be readily apparent on the outside and it's AC operating voltage need to be at least the minimum of the original. (can be more voltage spec'ed but not less) and the capacitance value needs to be the same as the original for a brushless gen. If you tried to use starting caps would not be a good thing. The starting cap type are not designed for a continous AC voltage operating load and will overheat and sometimes explode when they give er up and also can short ckt! Next you need to make sure that the diodes are rated at least 6 amps and the Peak Inverse Voltage (PIV) is at least the minimum of the original diodes whcih is usually around 250volts. Installiation of either or both of the diodes bass ackwards (reversed) might result in a frying.
(make sure you get the diode polarity correct. (for example) If the original diodes were 6 amps at 250vPIV a replacement can be higher, like 10-15 amps at 500piv) You have to keep a heads up on the higher amp diodes because the case may be metal and it has to be insulated from touching other components or windings, whereas most 6 to 10 amp silcon diodes are epoxy type case. I kinda suspect that your parallel caps may have resulted in your current issues! (most brushless gen's are kinda critical of the cap value for proper operation! Arkie, The ohm reading on the diodes is open one direction and mega ohms the other direction.
There is no sign of burning or melting of either the resister (27k) or the diode. The MR760's are rated at 1000 v and 6 amps.
I am not sure why they have such a high voltage and wonder if I could use something closer to 500v because they would be easyer to get. The capacitor I have coming on Monday is the exact same capacitor that I melted.
If it is oil filed maybe the oil got so hot it melted the plactic that expanded and ruptured the case. Do you have any suggestions as to a NTE diode that might work? The electronics place I am going to does not carry Motarola. Thanks again for your input. I need to understand how these induction generators work. F o r u m Jump Similar Threads Chosen at Random Thread Thread Starter F o r u m Replies Last Post tonydix Generators & Electric Motors General Discussion 4 12:07:46 PM cordless89 Generators & Electric Motors General Discussion 5 07:53:49 PM WilsonsK Generators & Electric Motors General Discussion 26 08:04:53 PM F.
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