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Old 08-27-2013, 05:39 PM   #1
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Power management problems

My coach is rigged with a power management system that enables me to operate on 50/30/20 amps or a 5500w generator. I am currently plugged into a 50amp outlet and my management panel should indicate that 50amps are available. For some unknown reason it will only show 30amps. The auto switch is working and when I run the generator it does indicate as much. I am getting full voltage but cant figure out how to check the actual amperage available. Can anyone direct me on which way to go?
Any help would be greatly appreciated.
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Old 08-27-2013, 06:06 PM   #2
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Are you getting 120V on both incoming legs?
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Old 08-27-2013, 06:42 PM   #3
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Check all your 120v breakers, make sure they are on.
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Old 08-28-2013, 05:25 PM   #4
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Originally Posted by jesilvas View Post
Are you getting 120V on both incoming legs?
I agree. It sounds like only 1 leg is hot. There could be a bad connection at the power post or the transfer switch. I would unplug from the power post and check each leg of the socket to ground with a multimeter. If everything is ok there remove the cover from the transfer switch plug in again and make the same tests.
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Old 08-28-2013, 07:33 PM   #5
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The EMS is looking for 240VAC to sense that you are connected to a 50AMP service. If the service is not 240 at the post the EMS will not switch to 50amps.
You should check the power at the post for the correct 240 and be sure and check all of the circuit breakers. The water heater circuit breaker is one of the legs the EMS is checking. There was a very long thread a couple of months ago with the same problem and he had turned off the water heater breaker.
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Old 08-28-2013, 07:54 PM   #6
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Also in some older areas they have what is called high eg ground which is when one of the feeder legs are actually grounded by design. This would show up as a 120 volt circuit on your panel.
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Old 08-28-2013, 08:10 PM   #7
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Make sure that your circuit breakers on your Inverter/Charger are not in the tripped position. I suspect maybe one of them has been tripped.

Remember that all 120 VAC goes through your Inverter and its acting as a "Pass-through" device. If one CB is tripped than you will only get one side.

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Old 08-29-2013, 08:34 AM   #8
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Well gang, I certainly appreciate all your imput and have done everything that has been suggested. I am getting 120/240volts both at the power pole and through the transfer switch to the circuit panel. I have tested all the grounds for continuity and stray current, I've tested each circuit breaker, I have measured the actual amperage being used and it measures the same as being displayed. So I can find no problem with the system other than a display. But...it doesn't make good sense. I have found where the unit measures the amperage being used, but where does it know or how does it know the available amperage?
Again I respectfully seek the wisdom of my fellow campers.
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Old 08-29-2013, 09:07 AM   #9
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Disregarding the safety ground which,in theory, should carry no current anyway, 50 amp service looks like this

1--120v--N--120v--2
1 - - - - 240 v - - - 2

As you can see there is 120 volt either leg to neutral but 240 across the two legs.

Some parks, however, did not feel like burying all new cable so they just put a 50 amp outlet on what used to be a 30 amp line.

Thus you get

1 - 120 - N - 120 - 2
1 - - - - zero - - - - 2

Your energy manager sees this it assumes you are plugged into 30 amp with a dog bone, cause that is exactly how they are wired.

To confirm you need a mulit meter that can measure the voltage ACROSS the two sides of the 50 amp outlet.

The outlet lines are as follows (disregard periods)
. . . |N
1| . . . . |2
. . . G

Throught this post 1 means "Leg 1" 2 means Leg 2 (Though they are interchancable) N is Neutral and the G on the plug diagram is the safety ground.

1, 2 and N are flat slots, G is round or "U" shaped.
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Old 08-29-2013, 09:25 AM   #10
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Quote:
Originally Posted by Dr4Film View Post
Make sure that your circuit breakers on your Inverter/Charger are not in the tripped position. I suspect maybe one of them has been tripped.

Remember that all 120 VAC goes through your Inverter and its acting as a "Pass-through" device. If one CB is tripped than you will only get one side.

Dr4Film ----- Richard
Not true on the MH in question. Inverter/Charger is 30 amps out only. The hot water heater, A/C compressor(s), and washer/dryer (if any) are wired outside the Inverter/Charger.
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Old 08-29-2013, 09:34 AM   #11
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You might try resetting the unit by removing the fuse on the circuit board.

The unit doesn't know how many amps are available, but is programmed. When it recognizes a 50 amp circuit it will not shed loads. When set to 30 or 20 amps, will shed to stay below those limits.

Try turning everything on and see if it sheds or not to stay below 30 amps.
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Old 08-29-2013, 09:55 AM   #12
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Originally Posted by coffeesnob View Post
Well gang, I certainly appreciate all your imput and have done everything that has been suggested. I am getting 120/240volts both at the power pole and through the transfer switch to the circuit panel. I have tested all the grounds for continuity and stray current, I've tested each circuit breaker, I have measured the actual amperage being used and it measures the same as being displayed. So I can find no problem with the system other than a display. But...it doesn't make good sense. I have found where the unit measures the amperage being used, but where does it know or how does it know the available amperage?
Again I respectfully seek the wisdom of my fellow campers.
As other folks have said, the Intelletic Power Line EMS detects voltage in a certain configuration to determine if you have "50 amps". Your Intellitec panel does not display the amperage when plugged into "50 amps". Since you say something is displayed, your system thinks "30 amps".

Has the Intellitec section of the manual included in your owners packet been helpful?

Are you measuring the AC current with a clamp-on ammeter?
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Old 08-29-2013, 10:03 AM   #13
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Originally Posted by coffeesnob View Post

I have found where the unit measures the amperage being used, but where does it know or how does it know the available amperage?
Again I respectfully seek the wisdom of my fellow campers.
You haven't posted what EMS system your coach is using but here is what Intellitec uses to measure the incoming amps to determine what mode to put it in, 50 or 30. It is located behind the EMS panel.

Intellitec Current Sensor 50 EMS PN 00 00703 000 | eBay

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Old 08-30-2013, 06:40 AM   #14
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EMS mode is control by sensing the incoming voltage. The current sensing coil is on the neutral leg and will not give a total current reading when connected to 50amp/240vac and so the amp reading is blacked out.
Here is the other thread with a EMS problem.
http://www.irv2.com/forums/f101/50-a...cy-166300.html
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