Joethemechanic
Senior Member
- Location
- Hazleton Pa
- Occupation
- Electro-Mechanical Technician. Industrial machinery
I was kind of thinking small transformer to provide for the 120 loads. Or a transformer to establish a neutral
trying to remap a wye into a delta
- Thread starter yogi32536
- Start date
- Status
Correct they aren't liking the 139
winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
I'm with @Joethemechanic . A normal motor won't care about high leg delta, but anything run with a VFD will be happier with 240/139 wye. (It is a bigger issue with 480/277wye vs any of the deltas, but in general VFDs are happier with balanced supplies.)
The SCDA load will be much smaller than the motors being controlled.
Leave the generators unmodified, and provide a 240:120V transformer for the SCDA and UPS.
What does the 7th level of the VSS do? It doesn't look connected to the alternator outputs, and the schematic you posted shows it connected to 'J56 on sheet 6'. Is this the connection for the voltage regulator, or is it a spare that could be used for switching the transformer primary from 240 to 480V?
-Jon
The SCDA load will be much smaller than the motors being controlled.
Leave the generators unmodified, and provide a 240:120V transformer for the SCDA and UPS.
What does the 7th level of the VSS do? It doesn't look connected to the alternator outputs, and the schematic you posted shows it connected to 'J56 on sheet 6'. Is this the connection for the voltage regulator, or is it a spare that could be used for switching the transformer primary from 240 to 480V?
-Jon
That is likely possible with a custom selector switch.
Birken Vogt
Senior Member
- Location
- Grass Valley, Ca
It is certainly possible. But will it be practical? Not for the customers I work for. But it could be with this number of units to do, and a government agency $$,$$$ behind it.
One other thing, if you do this job, you will have to keep track of which is the high leg, as well as phase rotation, when connecting one of these rental/portable gensets at a remote location.
One other thing, if you do this job, you will have to keep track of which is the high leg, as well as phase rotation, when connecting one of these rental/portable gensets at a remote location.
The cost isn't tooo bad, last switches I bought were for 120kw gensets and I remember them being under $1000/ea
- Status