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Old 07-03-2008, 10:39 AM   #1
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7.5kw QD 2007 Tiffin Allegro Bus 40QSP

I hooked up the 120v to 12v transformer TMH supplied to Line 1 110v and the common of the SP input to the transfer switch. This is also the output from the PI. I confirmed all of the parameters of SETUP GENSET and SETUP AUTO. I subsequently ran the TEST SYSTEM without issue. It found the PARK safety, HVAC1 run request, RUN GEN successfully and found SHORE AC PRESENT. I went to test the system by turning OFF the the SP breaker with no load on it, turned ac 1 to ON and within a minute the gen started up. It would NOT start the gen just because the SP was OFF without HVAC1 being ON as well. The gen ran for about a minute and then shut down. The AGS control module was flashing "FAULT LOST SIGNAL."

The gen runs fine, it starts and stops without issue from any of the 4 switches - dash, bedroom, AGS control module and gen.

Onan Technical Support was absolutely NO help. All they wanted me to do was to bring the coach to a Cummins Power South facility to have it "professionally" trouble shot. hock: They refused to tell me what the possible sources of that particular error are from the Service Manual.

Any thoughts and guidance would be greatly appreciated.
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Old 07-03-2008, 10:39 AM   #2
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7.5kw QD 2007 Tiffin Allegro Bus 40QSP

I hooked up the 120v to 12v transformer TMH supplied to Line 1 110v and the common of the SP input to the transfer switch. This is also the output from the PI. I confirmed all of the parameters of SETUP GENSET and SETUP AUTO. I subsequently ran the TEST SYSTEM without issue. It found the PARK safety, HVAC1 run request, RUN GEN successfully and found SHORE AC PRESENT. I went to test the system by turning OFF the the SP breaker with no load on it, turned ac 1 to ON and within a minute the gen started up. It would NOT start the gen just because the SP was OFF without HVAC1 being ON as well. The gen ran for about a minute and then shut down. The AGS control module was flashing "FAULT LOST SIGNAL."

The gen runs fine, it starts and stops without issue from any of the 4 switches - dash, bedroom, AGS control module and gen.

Onan Technical Support was absolutely NO help. All they wanted me to do was to bring the coach to a Cummins Power South facility to have it "professionally" trouble shot. hock: They refused to tell me what the possible sources of that particular error are from the Service Manual.

Any thoughts and guidance would be greatly appreciated.
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Old 07-03-2008, 03:03 PM   #3
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S U C C E S S!!!!!!!

Onan Tech Support - WORTHLESS

TMH's JC Blackburn - PRICELESS

JC was not definitive on the exact source of the problem but he had enough insight and experience with the system and its installation to send me in the right direction. :wink: He believed there was a loose start/stop connection somewhere between the gen and the EC-30. He said to first confirm the AGS settings and go through the TEST SYSTEM again which all tested okay. Then check to make sure the hour meter was counting which it was. Then make sure its terminals and the gen harness connector behind it were secure which seemed secure. Then he said check the terminal connections on the back of the dash start/stop switch which seemed secure. Then check the 3 harness connectors in the gen compartment. I disconnected them and lightly sprayed the pins and terminals with CRC 6-56.

I turned off all loads then turned OFF SP. I turned ON the front a/c and the gen started right up and continued running. I ran the gen for 5 min then turned SP back ON. The gen did NOT automatically turn OFF after 10+ min because the a/c was still ON. I turned UP the thermostat to turn OFF the a/c. Then ran it for another 10+ min before automatically turning OFF.

I have no idea which of the above was/were the culprit but JC sent me in the right direction with success!!! I spent alot of time under the dash running the wires to the AGS so it's very possible that something was jostled loose.

The EC-30 will run the gen for a MIN of 10 min to prevent short cycling the gen and a/c even if the request has been satisfied in less than 10 min. The a/c and voltage requests are the primary triggers for the AGS. SP is only a secondary/safety in that its presence or lack thereof WILL NOT start/stop the gen alone.
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