David Anderson (66.90.195.97)
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Votes: 0 | | Posted on Wednesday, January 08, 2003 - 10:24 pm: | |
You might call Dick Wright at Wrico 541-744-4333. He is a guru when it comes to these things. I don't think you can accomplish this without a transfer switch. It looks like you want both power sources to go through the Trace and if both are on simultaneously, if my memory is correct, the Trace will default to AC1 in, even if AC2 in, is on at the same time.
This stuff gets real tricky because only one phase of your genset or one phase of your shore cord feeds the trace at 110volts. The other phase bypasses the inverter and goes on to a panel.
I used a 50amp transfer switch that switches all hots and neutrals. The load side of the transfer switch feeds a main panel. In that panel one of the breakers is a single pole 50amp breaker with a #6 wire that goes to the Trace "AC1 in". The Trace hot out goes to a subplanel (110volt only) that distributes power to all the circuits I want to run off the Trace.
The genset powers the transfer relays. In idle state, the relays default to shore power. When genset is powered the relays bond the neutral to the ground lug for the genset. When the shorepower is on, all neutrals and ground are unbonded.
Here is the part of my system that may raise your eyebrow. When no shore power is on and no genset running, I plug in a 50amp female plug into the end of my shore cord that has a #6 wire bonding jumper between neutral and ground. This makes my 50 amp main disconnect effectively bonded to itself. Its ground wire is bolted to the lug where my 12 volt neg wire is and where the ground wire for the Trace is, all in one place. I've explained this setup on the board before and everyone has all kinds of opinions about it. I don't know if it is code, but it makes my ground all in one place no matter what the power source.
This, like you said only allows for one input to the Trace since the load side of the tranfer switch only has one output, so the Trace doesn't know if it is from genset, or shore power.
I have thought about another relay on the load side of the tranfer switch that would, when power is supplied by genset, energize the relay and send power out another cable to "AC2 in" on the Trace, thus fooling it to think power is coming from a generator. This would allow the use of the sophisticated load support features of the Trace.
At this point I haven't been able to justify doing that. Perhaps later on as I use the bus more I may need that and can add it later.
This doesn't answer your question very well, but it is just an opinion on the way I did mine.
David Anderson |