No 50 AMP on shore power

[jswat]

A new problem for me, I can only get 30 AMP coming into my coach even though I am connected to a 50 AMP OUTLET. The outlet checks good with my multimeter. When I switch to the genset I have full power. Could this be a failure of the transfer switch? I have the IOTA ITS-50R switch. My coach is a 2004 HR Ambassador.

[rgatijnet1]

dougrainer wrote:

rgatijnet1 wrote:

dougrainer wrote:
1. Doubt the Transfer switch is bad. It is extremely rare for a transfer switch to only close 1 leg of power.
2. Your EMS senses the OUT OF PHASE 2 -120 legs of power. IF those 2 legs are on the same phase, the EMS assumes you have 30 amp service
3. VERIFY that you have double the line voltage between the 2- 120 legs at the 50 amp service pole(3 and 9 position). IF NOT, you do not have 50 amp service. But, "Cheated" 50 amp service. Cheated is a 50 amp breaker on the same phase supplying ONLY power on a 50 amp breaker and not a TOTAL of 100 amps which is true 50 amp service
4. EMS systems do not have to be "set" to 50 amp service. It is Automatic when connected to true 50 amp service. You cannot even change to 30 or 20 if on 50 amp service.
Do these tests and post. Doug

My Intellitec EMS sytem has a button on the left side to allow me to select 30 or 20 amp service, even if I am plugged in to 50 amp service.

From the EMS manual. Doug

NOTE When connected to 50Amp-240VAC service the Energy Management features of the unit are disabled and the Unit switches all controlled loads"ON".

Besides, if ON 50 amp serviced(100 amps) WHY WOULD YOU WANT OR BE ABLE TO SET 30 0R 20 AMPS????????????????

Good point BUT why did the manufacturer put the button there to switch input. Before I posted I went to my panel and I can push the button and change to a lesser input power than what I am connected to. Apparently the manufacturer had some reason to do this. If it is all automatic, no push button would ever be needed.

[dougrainer]

1. The recall for certain transfer switches had nothing to do with the design of the Switches. It had to do with correctly securing the power wires to the switch connections. Incorrectly torqued wires cause fires. The connections were made by the OEM
2.When on Genset, THE ONLY THING TELLING THE EMS THAT THE GENSET IS ON LINE IS A 12 VOLT FEED SIGNAL WIRE FROM THE GENSET HOURMETER. NOTHING else. Gensets are NOT 50 amp supply appliances. They supply 47 to 68 amps(depending on the model) of supply and are single phase Gensets. 10k and 12.5 k gensets are true 2 phase gensets and supply 97 to 104 amps of power.
3.The OP has never stated what his voltage IS between the 2 hot legs. Doug

[dougrainer]

delete double post

[time2roll]

usersmanual wrote:
yes I know and that's why I as you have asked the OP to meter across the 120V outs and make sure hes got 240V BUT what If he does have 240V then whats your opinions as to what is complaint is caused by?
My understanding and may be wrong is the EMS works on generater or SP
does it not?

No need to cover all possibilities. If the supply is correct, the EMS has an issue.

The idea is to verify if the supply is the issue or does the RV need to go in for service.

[dougrainer]

rgatijnet1 wrote:

dougrainer wrote:
1. Doubt the Transfer switch is bad. It is extremely rare for a transfer switch to only close 1 leg of power.
2. Your EMS senses the OUT OF PHASE 2 -120 legs of power. IF those 2 legs are on the same phase, the EMS assumes you have 30 amp service
3. VERIFY that you have double the line voltage between the 2- 120 legs at the 50 amp service pole(3 and 9 position). IF NOT, you do not have 50 amp service. But, "Cheated" 50 amp service. Cheated is a 50 amp breaker on the same phase supplying ONLY power on a 50 amp breaker and not a TOTAL of 100 amps which is true 50 amp service
4. EMS systems do not have to be "set" to 50 amp service. It is Automatic when connected to true 50 amp service. You cannot even change to 30 or 20 if on 50 amp service.
Do these tests and post. Doug

My Intellitec EMS sytem has a button on the left side to allow me to select 30 or 20 amp service, even if I am plugged in to 50 amp service.

From the EMS manual. Doug

NOTE When connected to 50Amp-240VAC service the Energy Management features of the unit are disabled and the Unit switches all controlled loads"ON".

Besides, if ON 50 amp serviced(100 amps) WHY WOULD YOU WANT OR BE ABLE TO SET 30 0R 20 AMPS????????????????

[usersmanual]

smkettner wrote:

usersmanual wrote:
do you people even read the posts?? He clarified the problem
How could it be the EMS if it works perfectly on generator power

He says he can run 2 AC on generator but not on shore power
he says all service/outlets work both ways
his complaint as stated is he has to shut off(example) the HWH
when on shore power to run two AC units but everything works 100% on generator

EMS is registering 30 amp service. Typically a 30 amp adapter will connect both hots of the RV to the single hot of the 30 amp supply. This has zero volts between L1 & L2 in the RV. The EMS is cutting out various loads (normal load shed) because it thinks only 30 amp supply is available. Power would still be available to all items until the total exceeds the 30 amps when the EMS starts limiting.

Turn on the generator and the EMS knows it has full generator power.

So the first issue to verify is if the L1 & L2 of the pedestal has 240 (or 208) volts. Some are not wired properly. The specifics of the supply testing were not given.

yes I know and that's why I as you have asked the OP to meter across the 120V outs and make sure hes got 240V BUT what If he does have 240V then whats your opinions as to what is complaint is caused by?
My understanding and may be wrong is the EMS works on generater or SP
does it not?

[time2roll]

usersmanual wrote:
do you people even read the posts?? He clarified the problem
How could it be the EMS if it works perfectly on generator power

He says he can run 2 AC on generator but not on shore power
he says all service/outlets work both ways
his complaint as stated is he has to shut off(example) the HWH
when on shore power to run two AC units but everything works 100% on generator

EMS is registering 30 amp service. Typically a 30 amp adapter will connect both hots of the RV to the single hot of the 30 amp supply. This has zero volts between L1 & L2 in the RV. The EMS is cutting out various loads (normal load shed) because it thinks only 30 amp supply is available. Power would still be available to all items until the total exceeds the 30 amps when the EMS starts limiting.

Turn on the generator and the EMS knows it has full generator power.

So the first issue to verify is if the L1 & L2 of the pedestal has 240 (or 208) volts. Some are not wired properly. The specifics of the supply testing were not given.

[usersmanual]

hanko wrote:

smkettner wrote:

jswat wrote:
The outlet checks good with my multimeter.

Just verify for us that you measured 240 volts between L1 & L2.

That is the proper way to describe it. I love the two legs of 120 description. I knew this was going to turn out to be another ( I know more than you post).

most anyone with even 1/2 a notion would fully understand

[usersmanual]

rk911 wrote:

rgatijnet1 wrote:
Perhaps your Energy Management System is not set for 50 amps.

that's also what I was thinking but the OP needs to clarify the problem. but in addition if all of the appliances are working but some of the outlets are not then I'd check for a tripped GFI outlet.

do you people even read the posts?? He clarified the problem
How could it be the EMS if it works perfectly on generator power

He says he can run 2 AC on generator but not on shore power
he says all service/outlets work both ways
his complaint as stated is he has to shut off(example) the HWH
when on shore power to run two AC units but everything works 100% on generator
Like I First suggested earlier he needs to double check across the 120V outs and make sure theres 240V there

[hanko]

smkettner wrote:

jswat wrote:
The outlet checks good with my multimeter.

Just verify for us that you measured 240 volts between L1 & L2.

That is the proper way to describe it. I love the two legs of 120 description. I knew this was going to turn out to be another ( I know more than you post).

[hanko]

usersmanual wrote:

hanko wrote:
with your voltage tester, check to see if you have 230 volts between phases at the park pedestal, if you do, the problem is inside the coach. Possible a transfer switch issue or a bad two pole 50 amp breaker in the panel

the OP CLEARLY said he has correct voltage at park supply

he said no such thing, re read it

[Corkey05]

The IOTA transfer switch is a known failure point. In fact it was recalled, but when it was Monaco had already closed it's doors. Most Monaco brand owners have changed the transfer switch to avoid the fires they were recalled for.

Even if the transfer switch isn't the problem, change it.

[rk911]

rgatijnet1 wrote:
Perhaps your Energy Management System is not set for 50 amps.

that's also what I was thinking but the OP needs to clarify the problem. but in addition if all of the appliances are working but some of the outlets are not then I'd check for a tripped GFI outlet.

[time2roll]

jswat wrote:
The outlet checks good with my multimeter.

Just verify for us that you measured 240 volts between L1 & L2.

[rgatijnet1]

dougrainer wrote:
1. Doubt the Transfer switch is bad. It is extremely rare for a transfer switch to only close 1 leg of power.
2. Your EMS senses the OUT OF PHASE 2 -120 legs of power. IF those 2 legs are on the same phase, the EMS assumes you have 30 amp service
3. VERIFY that you have double the line voltage between the 2- 120 legs at the 50 amp service pole(3 and 9 position). IF NOT, you do not have 50 amp service. But, "Cheated" 50 amp service. Cheated is a 50 amp breaker on the same phase supplying ONLY power on a 50 amp breaker and not a TOTAL of 100 amps which is true 50 amp service
4. EMS systems do not have to be "set" to 50 amp service. It is Automatic when connected to true 50 amp service. You cannot even change to 30 or 20 if on 50 amp service.
Do these tests and post. Doug

My Intellitec EMS sytem has a button on the left side to allow me to select 30 or 20 amp service, even if I am plugged in to 50 amp service.