• Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!

  • Microsoft MSN, Live, Hotmail, Outlook email users may not be receiving emails. We are working to resolve this issue. Please add support@steelsoldiers.com to your trusted contacts.

MEP-804A cranks and starts, but does not stay running.

Pain

New member
3
1
3
Location
Pittsburgh, PA
Greetings all!

The problem arises when you change the frequency select switch to 60hz (with the genset off) and attempt to start it in this condition. It will run for a brief moment, until you take your hand off the start switch and it goes to prime and run, where it will then immediately shut down and the “over voltage” fault indicator will light. I should add to this that the engine seems to sound louder/faster when starting it in the 60hz setting.

Strangely when shut off and switched to 50hz, the genset starts and runs momentarily, and does the same as stated above (runs briefly and dies, over voltage lamp lights up). This strikes me as odd, as last week I had it running in the 50hz mode, albeit with some very odd and abnormal seeming readings on my multimeter. Now it won’t even stay running in either selection.

To add more information, In both freq settings I observed the gauge needles moving.

I’m open to any and all advice as the manual hasn’t been helpful with my progress.

Note:

I recently discovered that there is apparently a MWO for this model of genset, where you add a 3 amp fuse to one of the wires on A1.

This brings up another question I have. Would the lack of this fuse modification cause this to occur?

Thank you for reading and I look forward to hearing from others.

-Pain
 

Tinstar

Super Moderator
Super Moderator
Steel Soldiers Supporter
4,438
2,305
113
Location
Edmond, Oklahoma
Download the TM's for your generator and familiarize yourself with them.
Lots of great info.

The generator experts will point you in the right direction.
 

kloppk

Well-known member
Steel Soldiers Supporter
2,294
4,064
113
Location
Pepperell, Massachusetts
Has this generator produced proper power for you in the past?
Or are you troubleshooting a "new to you" generator?

The 3 AMP Fuse MWO simply adds a fuse in one of the leads from the A1 AC Voltage Regulator to the Static Exciter inside the Gen Head.
It's purpose is to protect the gen head from damage should the Voltage Regulator fail sending too much voltage to the gen head. The fuse blows to protect the static exciter from burning up due to a bad voltage regulator.
Shown here is the schematic
1752509960681.png

The engine will be running at a higher RPM when set to 60 Hz. The AC Output Frequency is directly proportional to engine RPM.
At 60 Hz the RPM is 1,800
At 50 Hz the RPM is 1,500

First I'd suggest getting the MWO installed to protect the Static Exciter from damage. Don't run the set until you get it installed.

After it's installed I'd suggest performing the AC Voltage Regulator Testing as specified in the -24 TM.
 
Top