Onan Otpc Manual
OTPC transfer switches are designed for operation and switching of electrical loads between primary power and standby generator sets. They are suitable for. Onan Automatic Transfer Switch Wiring Diagram. You the 24 HP ONAN ENGINE WIRING DIAGRAM ONAN OTPC TRANSFER SWITCH MANUAL SCHEMATIC DIAGRAM set.
Hello Experts, I have an Onan OTPC ATS (model/serial attached) that has been flawless since it was installed in 2006. This January the generator it was connected to was replaced with a new generac genset (also attached). Every week the ATS initiates an automatic exercise of the genset (no load). It has never failed.
Once a month I test the system under load by manually cutting power to the ATS. That has also never failed - I ran this transfer test last Tuesday 4/6. On Thursday 4/8 we had a power outage and my load lost power.
Nobody was onsite at the moment of the outage so I am not sure what exactly occurred. A user arriving during the outage was able to start the generator manually without issue. On Friday 4/9 I cut power to the entire building in an attempt to replicate the failure but transfer occurred as it should. I have come to this excellent forum in search of assistance diagnosing what transpired and how I might prevent a future failure. He he thanks Billy if you are speaking about the 4 batteries visible in the attached picture I replaced them just this Feb.
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So it sounds like the generator spun up but the ATS never saw proper voltage so never transferred - then the switch ran low on battery power and powered off. I can only assume the generator powered itself off at the same time? It's difficult for me to grasp that the generator was not producing the proper voltage - it's brand new! But I suppose anything is possible. Is there any sort of alert mechanism I would be able to leverage so that at least if this occurs in the future I could be notified proactively?
Thank you for your input. It would be a disservice to you if I failed to say that most experieced generator technicians would have little difficulty accepting exactly that scenario. Also interesting is that presumably there was a 2006 Onan that went with the transfer switch, that had to be replaced? It may be important to mention, that all the communication the transfer switch sends to the generator, is shorting out two wires so it cranks and starts. And the only communication that the transfer switch gets from the generator, is that the transfer switch looks for it to make 'in range' voltage output. Once your guy arrived onsite and 'reset' the generator, all evidence of what malfunction it had was erased.
Onan Otpc Ats Service Manual
Also, from the log, I see problems in the set's output-at 7:21 it appears the set lost voltage again? Unless someone cut the generator off before the TDEN timed out. (BAD!) Once the transfer switch has utility restored, any failure of the generator will initiate an immediate transfer back to utility.
Why are the TDEN and TDEc timers set so fast? Typically they would be 5-15 minutes on the TDEN and 5 minutes on the TDEc.
Unless someone is hitting the delay bypass button, they seem to be set to 1 minute each. With a 3600rpm screamer, giving it a generous cooldown delay is a good idea. Finally, the set is only 4 months old total-why not make Generac warranty service it? They might even have a recall on the generator.
Working blind here; this is a prefer to be there to poke and prod troubleshooting scenario, but suspect your Generac was having issues. Why did the genset die? Should have been a red light, or display text depending which control package you have, and the first responder should have recorded that incident. In real world application, it was probably sitting there with no lights/alarms.
Would there be extra load on at that time of morning, that is not usually on? Why does the voltage fail? Has the voltage of this genset been monitored for an extended duration, while supplying the facility with load? What is the measured voltage? I concur w/Pegasus, I think your S2 undervoltage at 7:21 is a clue, unless there was human intervention. Go into the set up of your transfer switch and see what the settings are for Source 2 drop out percent, and time delay for undervoltage.
If running a gas unit, and picking up a block load during transfers, you will want to lower the dropout percentage to around 80%, and lengthen the undervoltage time delay out to a good 3 or 4 seconds-they are defaulted to a very short time. I doubt this is an issue, though, as you have had many good test performed by dropping input power to the ATS previously. As for that network card. This is an FT-10 card, that CPG uses for their equipment to communicate back and forth.
It can communicate to any building management system that uses ModBus, but you'd have to have CPG come in and install a ModBus adaptor and network at the switch to get it up and running. The data you would get would be the scrolling history/faults you view on the display screen, and load data, if the load module was installed (volts/amps/pf/kw/kva). Also, can have ability to be remotely controlled for testing/transfer/transfer inhibit/reset-any button or contact function basically, can be emulated through ModBus.