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Military MEP and Aircraft Gen-Sets

MEP-002A Low Voltage


I recently acquired an MEP-002A generator and the AC output seems to be low. In the tech manual it...

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  #1  
Old 12-19-2010, 04:04 PM
Onan Onan is offline
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Default MEP-002A Low Voltage

I recently acquired an MEP-002A generator and the AC output seems to be low. In the tech manual it states that the output voltage should be between 228 and 252 volts within the full range of the AC voltage control on the control panel. On my unit the voltage is between 194 and 237 volts within the full range of the control. I am using a quality Triplett multi meter for my readings.
Is there another adjustment for this perhaps on the voltage regulator or elsewhere?
Can either be used on this unit as an aid for cold weather starting?
Any help or suggestion would be appreciated
Thanks
Jerry
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Old 12-19-2010, 11:09 PM
David C David C is offline
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Default Re: MEP-002A Low voltage

Is it running the proper speed? Are you relying on the panel hertz meter or are you using a handheld meter? I would not use ether due to the intake heater and glow plugs that the Onans have. It should start in some fairly cold weather without ether.

David C.
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Old 12-20-2010, 07:14 AM
Onan Onan is offline
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Default Re: MEP-002A Low voltage

David:
I am not using the panel instruments. For the voltage I am using a Triplett multi meter and for the cycle/engine RPM I am using a 60 cycle reed type frequency meter.
Thanks
Jerry
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Old 12-20-2010, 09:31 PM
David C David C is offline
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Default Re: MEP-002A Low voltage

Jerry,
Have you checked the rotating diodes. I had one fail on my MEP-003 and it caused a reduction in voltage, but I don't remember by how much. It has been several projects ago and CRS seems to be kicking in.

David C.
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Old 12-20-2010, 10:55 PM
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Jim McIntyre Jim McIntyre is offline
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Default Re: MEP-002A Low Voltage

Can the MEP-002A be set for either 120/240 or 120/208?
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Old 12-21-2010, 12:39 AM
Isaac-1 Isaac-1 is offline
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Default Re: MEP-002A Low Voltage

yes, the MEP-002a can be set for either 120/240 single phase or 120/208 3 phase. (also I think 120V single phase only, and if it is like my MEP-701a it can also do a strange 120V 3 phase mode)
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Old 12-21-2010, 06:05 AM
Onan Onan is offline
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Default Re: MEP-002A Low voltage

David:
No,I have not checked the diodes. Where are they located?
Thanks
Jerry

Isaac:
The reconnection switch is in the correct position.
Thanks
Jerry
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Old 12-21-2010, 10:39 PM
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Default Re: MEP-002A Low voltage

Quote:
Originally Posted by Onan View Post
The reconnection switch is in the correct position.
I see. By "correct position", you mean 120/240? That being the case, what are you worried about? 237 V is plenty close to 240 V for all practical purposes...

In my experience a bad rotating diode causes a major voltage loss.

Regarding ether, Onan, in their manual for the DJ series of genset, has a specific warning (in Bold Italic letters) stating ether can cause engine damage. This is consistent with my general rule-of-thumb, that ether is not for Diesels with preheaters...

Ether will undoubtedly help cold starting, but at what cost is the question.
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Old 12-22-2010, 10:01 PM
David C David C is offline
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Default Re: MEP-002A Low voltage

Jerry,
Check you email for a manual.

David C.
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Old 03-17-2011, 07:39 PM
NYDieselHead NYDieselHead is offline
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Default Re: MEP-002A Low voltage

Good manuals here for MEP002A and MEP003 and J-Series Onan engines and gensets:

http://www.scribd.com/Tereeeee/shelf
http://www.greenmountaingenerators.c...--support.html
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