[gary]

There is a time delay relay that controls the contractor. There are two in the breaker enclosure. One is for the shore power and the other for the gen set. You can interchange them until you get a replacement.

[Charles]

Tried to edit my post but it would not let me. There are two time delay relays that are mounted in the electrical box that houses the contractors etc.They plug in and are mounted on the bottom of the box. One controls the shore and the other the generator, you can switch them to check if that is your problem. From memory the relays are protected by fuses also mounted in the box.

[Rodger]

Thanks Bruce, I will check this out in the morning and let you know the outcome.

[Archived]

I would suspect the transfer switch Tom.

[Hector]

Hello Lee,

First, let me apologize for addressing you by your last name earlier.

I did as you suggested (switched the two relays) and pulled the fuses and checked for continuity. None of this solved the problem. I am still getting 240 V to the top of the connector but nothing coming out. Thanks for your contribution.

Tom Roberts

[Archived]

By the sounds of it you have a bad contactor. Your description said that you have power when on the generator but not on shore. If you have power to the contactor on shore and have switched out the activation relay and it did not cure the problem I would suspect that the windings of the contactor have failed. If your stuck you could swap the contractors. You could also temporarily bypass the contactor as long as you turn off the main breaker at the box on the coach before you connect or disconnect the shore power.

I would only suggest any of the proceeding if you have a good knowledge of electricity.

[Archived]

Tom

I know you said you were traveling but if you could post a picture of the box you are talking about, it might help us know where you have power and where you don’t. It sounds to me like your transfer switch has failed in the generator contactor position but I cannot be sure without knowing for sure which box you refer to, a pic would be very helpful.

Rob

91 XL40 “OLGA”

Missouri

[Archived]

Tom where in florida are you, they are many service facilites that can help you. Tampa, Sanford,Jax, that specializee in Prevost and convertor repair.

[Michael]

Thanks to all for your help. We are in St. Augustine, FL and, as a last resort, I will call Prevost in Jacksonville Tuesday morning to see if they can help.

Lee, I am not sure switching out the contactors would physically work. The one at fault is smaller, Square D – type PG1.11, whereas the larger one is a type PJ1.11. The larger one functions when starting and running the generator. I am at a loss as to where the transfer switch is!

Rob, I will try and post a photo of the AC control box.

Tom Roberts

[Hector]

Tom, Sorry for the misinformation on the contactors as I’m working from memory, now that you say that I do remember them being different. There is no “transfer switch”, switching from gen to shore is handled by the contactors.

[Michael]

In St Augustine Many marine repair facalities. Lots of high end boats/yachts share systems with coaches. Also campingworld on 95 but I would qualify service guy first. Also Millineum at Sanford Fla. Just a few that come to mind. I will be close in Feb but that doesn’t do you any good now. Most really good electricians can understand and fix your problem– they don’t have to be prevost specialist. I said good. Your system is not unique to prevost. If the guy at camping world doesn’t want you to watch or ask where the controls are run away fast far away.. The marine guy should ask because he is use to boats. Goog luck. Bob

[Bob]

Tom

Usually the contactors are located inside a box, usually the transfer switch unless the coach manufacture made their own transfer switch, which can be done. I have enclosed a link to the square D electrical catalogue. Once downloaded, go to page 33-35 to see if any of the displayed contactors type P match yours. If so, let us know which one and we can do a search to see who might have one close by to you.

http://ecatalog.squared.com/pubs/Machine%20Control/0140CT9201.pdf

Rob

91 Prevost XL 40

Missouri

[Archived]

Hello Rob,

I believe my contactors are shown in the diagrams in fig. 3, Pg 34 of the e-catalog. Mine are Class 8502, Types PG1.11 and PJ1.11 respectively. The PG one is the one in question.

Pertinent data for each follows:

Class: 8502 Type PG1.11 Type PJ1.11

Series: A A

VDE: 660 660

ICE: 158-1 158-1

BS: 5424 5424

lth: 130A 200A

AC: 1=80A 1=125A

Ui: 660V～ 660V～

AC: 3 3

Trust this and the photos below provide enough information. Once again, I sincerely appreciate your help.

Tom Roberts

[Archived]

Tom

A search shows there are 3 of these contactors on eBay at this time, all northeast US locations, sp probably not helpful except that they are around $150. Allied Electronics in Longwood (407-774-8411), Largo (727-392-8800) and Planatation (954-434-9001) FL also show them as “available”. Cannot search if “available” means in stock or can get them. Hope this helps get you back going.

Rob

91 Prevost XL-40

Missouri

[Andre]

The contactors shown have a manual test
button. With the generator off and shore power plugged in, Press the black
button on the contactor face or cover, if the power comes on, you probably have
a bad contactor coil. Note that some systems may/will have a mechanical
interlock or an electrical interlock preventing both contactors from closing automatically.
Manual activation will bypass an electrical safety but not a mechanical
interlock, you will still have fuse or circuit breaker protection. If manual
activation gives you a scare, make sure the generator is off; with shore power plugged
in and push the manual activation button with a short stick or broom handle.