Hello, I have a MEP004a generator and would like to know details about it's overcurrent protection. My questions are: Does this generator have adequate built in overcurrent protection capable of protecting its components from damage in the event of a fault or if the connected load increases above its output capabilities? If so, can you tell me the maximum load it will supply without tripping? I know it's rated for 15KW but I have seen information about these where they run them above 100% of the 15KW rated output. I currently have mine set up for 208/120 volt output and run it at 60 hertz. If my math is correct 15KW at 208/120 volts 3 phase equals 52 amps. Will it trip at 52 amps or will it allow a certain amount of overload? Thanks in advance for your help!
-
Steel Soldiers now has a few new forums, read more about it at: New Munitions Forums!
MEP004a
- Thread starter SMS
- Start date
dk8019
Active member
- 802
- 55
- 28
- Location
- Lovettsville, VA
If it's like my MEP002A, then there's an outfeed breaker that is designed to protect the unit. Does your's have a three pole breaker?
dk8019
Active member
- 802
- 55
- 28
- Location
- Lovettsville, VA
- 6,862
- 701
- 113
- Location
- Stratford/Connecticut
It will allow a good amount of overload. Even with battle short off. I didnt realize I was significantly over current and cooked a stator on one. The safety never tripped.
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
If that happened, then something was wrong with the overload protection relay. The official rated load for the MEP_804A is 52.8 Amps. Yes you can go a bit higher. But normally the overload/short circuit relay should protect you gen set. Your set has a 3 pole breaker, K1. All TQG gen sets have a 3 pole breaker.
Trying to find & replace the overload relay on an MEP004A with this new one from Oshkosh. Is it hidden inside one of the enclosed boxes? Looked in all the obvious places to no avail......
Attachments
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
Yes. Its in the Tactical Relay box. It should be marked as such. If not, look in the TM.
Thx very much Sir, found it. Two connectors are much easier to remove than the other one w all the connections (exciter box?). According to all the threads I searched If the overload light comes on, 99% its that relay. Is that a fair assumption?
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
Its a fair assumption. Some folks wire past it. But having seen what can happen when that is done, well, foolish.
The relay box with all the plugs is the Special Relay Box. The A5 card in it can be a problem. Member @kloppk makes a kick ass replacement.
The Static Excitor is next to it. Two plugs.
If the TM's are not readable, use the MEP-005A, 30 KW books. The only difference between them is two more jugs on the MEP-005. And the 30 KW books are more up to date.
The relay box with all the plugs is the Special Relay Box. The A5 card in it can be a problem. Member @kloppk makes a kick ass replacement.
The Static Excitor is next to it. Two plugs.
If the TM's are not readable, use the MEP-005A, 30 KW books. The only difference between them is two more jugs on the MEP-005. And the 30 KW books are more up to date.
Thx Sir. We've gotten a lot of very reliable service out of this particular MEP thx to your help. We also have a newer rebuilt one we've never gotten current out of yet (will work on it). I had this spare exciter box that I opened up, but for the life of me there isnt anything in there that looks like the replacement overload relay Oshkosh sells. Both are pictured.
Attachments
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
Picture on the right is a Static Exciter. You want the Tactical Relay box. Hang on and I will find a picture of it in the TM. I have the DHL guy at the door!
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
The 
Goes in the Tacical relay box. Show me a picture of what your box looks like.
Goes in the Tacical relay box. Show me a picture of what your box looks like.
I got lucky; swapped out the tactical box and I'm back up & running (thnk God for spare parts machine). I'll get you a pic of box tomm. Now I need to focus on why I'm not getting any output on our newest MEP. Kind of surprising, it runs great and was refurbed right before we got it, but only starts/runs w engine run & battle short switches on.
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
but only starts/runs w engine run & battle short switches on.
Do you get an idiot light?
Do you get an idiot light?
Not a one, even when I flip the test toggle (which is strange). 1 amp fuse is OK.
- 17,221
- 25,454
- 113
- Location
- Burgkunstadt, Germany
It could be a relay fault inside the A9, (Fault Indicator.) Take the C-Plug, (P6) off the A9. Find pin A on the P6. Turn on the set. see if you have 24 VDC at P6-A to ground. If you do, then take the A9 out and open it up. See if the relay is in there, in its socket. If so, get someone to help you for the next step. take two wires, go from a 24 VDC source to pins A&B on the A9. Then toggle the reset switch on the A9. The lights should come on.