ceb58
Senior Member
- Location
- Raeford, NC
We have a situation where someone thought a generator had taken a hit from lightning. The Gen. teck. and one of our guys found it had shutdown on over rev. The teck check the draw on the building and it was 24amps. every thing running. He found the UPS system tripped out. With the gen. running 100% of the load when they reset the UPS it would bog the gen. down and make it over rev trying to keep up. The gen set is a 45kw 240 1ph so it should be good for 180 amps. The gen. teck said that the UPS is pulling to much load. I do not know the kw rating or the power factor. The UPS has 6 modules in it and they said each module is pulling 5 amps ea. The UPS powers a panel that runs communication equipment so if you remove the a/c and lighting load which is not on the UPS panel it should be around 13-15 amps. The UPS systems we use will supply the load for 30-45 min. however they never go that long unless there is something is wrong with the gen. The gen. teck kept saying that the UPS was a restive load and two of the modules should be removed to keep from overloading the gen. Help me understand the reasoning as I was not there to see this for my self.