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Old 09-10-2019, 05:41 PM   #1
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EMS takes a dump???

So I'm sitting in the camper having a late lunch and suddenly the power shuts down to the camper. It's hot outside and the AC is getting a pretty good workout. I have a PI portable 30 amp EMS. First thought is the pedestal breaker has tripped, nope. I looked at the EMS display and it shows a PE4 code that means a previous low voltage shutdown. I'm thinking good, the EMS is doing it's job. The directions state if the unit has a PE code, unplug it and it will reset, which it did. I plugged the EMS back in and it showed the following;
PE4 code was gone
121 volts--normal
OA-not sure what this means
60H-not sure what this means
E0-indicating all is good
After waiting about 5 minutes, I plugged the camper back into the EMS and no power whatsoever. I tried this multiple times after waiting about 3 minutes each time. If I plug into the campground 30 amp receptacle all is good. I have noticed that the EMS is very hot just below where the cord plugs in. Any thoughts? I'm gonna call PI in the morning.
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Old 09-10-2019, 05:49 PM   #2
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Quote:
Originally Posted by TCNashville View Post
OA-not sure what this means AMPS no Load so 0

60H-not sure what this means HERTZ or 60 CYCLES per Second

E0-indicating all is good


After waiting about 5 minutes, I plugged the camper back into the EMS and no power whatsoever. I tried this multiple times after waiting about 3 minutes each time. If I plug into the campground 30 amp receptacle all is good. I have noticed that the EMS is very hot just below where the cord plugs in. Any thoughts? I'm gonna call PI in the morning.
Isn't there supposed to be a 2 min delay once you plug the camper into the EMS even though it's showing all's good.?
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Old 09-10-2019, 06:35 PM   #3
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I think the delay has 2 settings selectable by a jumper inside the unit. But yeah, that’s possible.
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Old 09-10-2019, 06:47 PM   #4
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Yes to Grumpy’s comment 0A is zero amps. If your inside breakers are not tripped then the “out” plug on your EMS may have burned. Double check your inside breakers (especially the main), force it off (completely) then back on.
A breaker will sometimes trip but still look like it’s on and must be pushed to the off position then back on to get it to reset.
If your EMS says zero amps then no power is going to the TT. The next task is to determine where the fault lies.
When I set up my main house breakers and the pedestal breakers are off. After plugging everything in I turn the pedestal on and watch the EMS display. Since the house breakers are off I will see 0A, if the EMS reports 0E (no errors) I switch on the house breakers. My first indication that power is reaching the TT is a beep from the micro.
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Old 09-10-2019, 06:59 PM   #5
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The hot spot on the cord of the EMS just below where it plugs in suggests that a wire may have broken and only marginally makes contact with each of the break while still trying to supply the demand of electricity. This will cause it to run hot at that point, possibly even to a point of softening or discoloring the insulation covering it.

It won't necessarily trip a breaker but it could play havoc on an instrument designed to be a catch all for electrical anomalies.
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Old 09-10-2019, 07:05 PM   #6
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Nother thought. You say the EMS has a hot spot. Is it on the “in” or “out” side of the EMS. “Hot” suggests a corroded wire or plug. The place that’s hot is where I’d look for a problem.
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Old 09-10-2019, 07:06 PM   #7
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(Double post)
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Old 09-10-2019, 07:33 PM   #8
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Quote:
Originally Posted by Grumpy View Post
Isn't there supposed to be a 2 min delay once you plug the camper into the EMS even though it's showing all's good.?
Yes there is a 2 minute delay before plugging into the unit. I waited at least 3 minutes each time I tried it.

Quote:
Originally Posted by stateboy View Post
The hot spot on the cord of the EMS just below where it plugs in suggests that a wire may have broken and only marginally makes contact with each of the break while still trying to supply the demand of electricity. This will cause it to run hot at that point, possibly even to a point of softening or discoloring the insulation covering it.

It won't necessarily trip a breaker but it could play havoc on an instrument designed to be a catch all for electrical anomalies.
The unit cord while plugged into the pedestal was not hot. My camper cord which plugs into the center of the unit was not hot. The unit itself was hot just below where my camper cord plugs in.

Quote:
Originally Posted by RedHorse1 View Post
Nother thought. You say the EMS has a hot spot. Is it on the in or out side of the EMS. Hot suggests a corroded wire or plug. The place thats hot is where Id look for a problem.
Neither cord was hot at all. It was the box of the unit just below center that was hot. When I plugged back into the unit after the reset I heard an audible "click" and no power after that.
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Old 09-10-2019, 07:43 PM   #9
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Did you try the EMS again after a cool down period of say one or two hours? Heat can be a factor. However, even if it worked again, I'd still contact PI and get their take on it. I've read nothing but great things about them and their customer service on the forum.
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Old 09-10-2019, 07:50 PM   #10
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Neither cord was hot at all. It was the box of the unit just below center that was hot. When I plugged back into the unit after the reset I heard an audible "click" and no power after that.[/QUOTE]

Ok, sounds for sure like something inside has fried. The click could be an internal breaker or relay. The call to PI sounds like the path. Id be hesitant to open the box to look around due to warranty issues. Ive read posts where PI really stepped up and provided great service so Id be inclined to take that route.

Let us know what you hear.
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