10 kw libby mep003a making power. not running the whole house.

[m35 adam]

I have a few of these sets. When I load test the on the house ever think work fine except with two of them. The stange part is they make 120 volts at the lugs and house gets power but the fridge light does not come on and the fan for the heat pump does not come. The heat pump it's self comes on.

The other units run the whole house fine. I hook them up the same and have the settings the same. Is there anybody that may know the problem? Thanks, adam

 

[Triple Jim]

I'd start by measuring the voltage at the appliances that don't work correctly when they're having the problems. Maybe for some reason the voltage at these appliances is out of the range that they want to see.

Another thing that comes to mind is that maybe only one side of the 240 is getting to the house, so half the 120V circuits in your house's breaker panel are powered and half are not.

 

[m35 adam]

Hi, thanks for replying so quickly. I'm getting 120 on all the breaking in the panel. I have a 5kw and in runs everything fine. heat pump fan and the fridge. The other 10k's do also and all off them are putting out 120 from each lug.

 

[DieselAddict]

That sounds like you have the generator set for 120v only output.

What is the output switch behind the instrument panel set to (120v or 208v or 240v?)

Only change the switch position with the generator off.

 

[m35 adam]

Hi, I have it set on 3 phase 208. I also tried it on 1 phase 240. same problem. thanks

 

[DieselAddict]

Can you explain more about how you have them hooked up? Maybe a few photos of the connections?

You need to set it to 240v.

 

[m35 adam]

I'm use 6 gauge 3 wire to a 70 amp breaker. I shut the main off not to back feed the line. red and black hot, white and ground to the neutral lug. The other unit work fine hooked up the same way. I can take some pictures.

 

[DieselAddict]

Check the voltage between L2 and L3 with the generator running. You should get 240v.

 

[m35 adam]

I'm getting 125 out of each lug and 215 when I put the 2 lead from the multi meter on the 2 and 3 lug or any of the 2 lugs. I'm also getting 120volt from the out lets in the house and all of the breakers in the panel.

 

[Triple Jim]

Check the voltage between L2 and L3 with the generator running. You should get 240v.

I realize that's probably just a typo, but on an 003A, 240 is between L1 and L3 when set to 120/240 single phase.

 

[DieselAddict]

I realize that's probably just a typo, but on an 003A, 240 is between L1 and L3 when set to 120/240 single phase.

Yes, you are right. L1 and L3 are the correct ones.

 

[m35 adam]

yes, getting 248 from the 1 and 3 lug.

 

[jamawieb]

Hi, I have it set on 3 phase 208. I also tried it on 1 phase 240. same problem. thanks

Why would you have it set to 3 phase for home back up power? It needs to be set to 120/240 single phase so everything in the house will run properly.

 

[m35 adam]

thats how I have run the bigger units in the past. Just leave one lug blank. It's the same problem on 1 or 3 phase.

 

[TNriverjet]

Nothing residential should be 3 phase. Right?

 

[m35 adam]

you can use it on the phase only running 2 hots not 3 hots. Thats the same as 1 phase.

 

[R Racing]

What happens when you run 3 phase is that the L1 and L3 are 120 degrees out. Were in single phase there 180 degrees out out . you may have to increase your voltage slightly to comp for being out 60 degrees.

 

[Triple Jim]

Not to mention that you won't be able to get as much power from the generator using 2 phases out of 3 as you would in single phase 120/240 mode.

 

[Daybreak]

Howdy,
Whatever your trying to accomplish, be careful.

Standard US power is 60Hz, and 110-120 volts. A lot of larger appliances can make use of 208 volts when it specifies it does. Standard wave form on the lugs are 120 volts either side of the neutral. That is why the 2 hots give you 240. The standard house wiring is just that. A bus bar which flip flop each side of the neutral for each of your 120 volt breakers. Then you have a dual pole breaker which uses both hots to send the 240 to say a electric water heater, a electric oven, a electric dryer, a large outside A/C unit etc...
It sounds like your not understanding electricity, and you can damage your wiring, and things plugged in too.

 

[rustystud]

Howdy,
Whatever your trying to accomplish, be careful.

Standard US power is 60Hz, and 110-120 volts. A lot of larger appliances can make use of 208 volts when it specifies it does. Standard wave form on the lugs are 120 volts either side of the neutral. That is why the 2 hots give you 240. The standard house wiring is just that. A bus bar which flip flop each side of the neutral for each of your 120 volt breakers. Then you have a dual pole breaker which uses both hots to send the 240 to say a electric water heater, a electric oven, a electric dryer, a large outside A/C unit etc...
It sounds like your not understanding electricity, and you can damage your wiring, and things plugged in too.

Or burn your house down ! 3 phase is for commercial applications only.