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Military MEP and Aircraft Gen-Sets MEP Mobile Electric Power, APU Auxiliary Power Unit and other military surplus generators.

Military MEP and Aircraft Gen-Sets

Frequently Asked MEP Questions


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  #1  
Old 05-07-2008, 09:17:42 AM
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Default Frequently Asked MEP Questions

Check the F.A.Q. on our main generator board, for more MEP information: http://www.smokstak.com/forum/showthread.php?t=47155
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Old 04-13-2010, 08:34:56 AM
K D Redd K D Redd is offline
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Default Re: Frequently Asked Generator Questions

TO ANYONE LOOKING AT A MILITARY GENERATOR, IF IT HAS A FREQUENCY OF 400 HZ, THERE IS NO WAY IT CAN BE COVERTED TO 60 HZ. Consider it a source of engine parts for a 60 HZ military generator.

Kent
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Old 11-09-2010, 07:57:02 PM
davey1000 davey1000 is offline
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Default Re: Frequently Asked MEP Questions

Disagree disagree disagree! OK aircraft and military gensets may produce 400Hz but this is no big deal. In fact Stihl used to make a superb 3KW electric chainsaw that needed a 10KW "high cycle converter". A 400Hz 3 phase generator makes power that can be cheaply rectified into DC. (suitable silicon bridge rectifiers cost about £2 each or less, at least two will be needed) Once the 400Hz has been converted into DC it can be used "as is" for appliances with universal motors (motors with carbon brushes) or heaters (not fan heaters just the non-motorised "electric fires"). Unfortunately modern switches tend to be of the "AC only" type. The old fashioned switches which break the current with a large gap are needed. Some "classic" power tools such as old Kango hammers do have switches that break the current with a large gap so they should be OK on DC but on no account try to use DC to power a magnetic drill (the drill will be OK but the electromagnet will burn out)
If the use of DC is not to ones liking an inverter will be needed. The common type takes 12 volts DC from a car battery and uses a switched mode converter running at 50 kilohertz or more. The 50KHz AC is then rectified back to DC! The reason for doing this is to obtain a higher voltage DC of about 300 volts. The 300 volts is then "chopped" or "inverted" using thyristors in a bridge circuit. Danfoss make converters that turn 50Hz three phase AC into variable frequency AC and such converters are used by the thousand in factories as cheap standard 3 phase motors can be made to run at different speeds or even backwards!
Incidentally "dumm" universal motors such as power drills or angle grinders THAT DON'T HAVE VARIABLE SPEED should work fine on 400Hz provided that the voltage is approximately correct. 240 volt to 110 volt transformers designed for 50Hz should also be OK (although they will be needlessly heavy) Most laptop AC adapters should be OK on DC but the figure of 8 input plug may need to be reversed. Good luck!

Note that electricity can kill and can cause fires. Experiment at your own risk.
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Old 09-11-2013, 09:43:46 AM
R Martin R Martin is offline
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Default Re: Frequently Asked MEP Questions

I have a MEP005AAS, the engine run great but no power, no Gauges working.
I need help finding a Manual and Possibly a service tech
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