Relisys190
Member
- Location
- USA
- Occupation
- Building Operator
Update:
After many weeks and several more attempts, the breaker company deemed the trip unit/logic unit bad on the P series breaker they sold to us. a digital ammeter was installed into the face of the breaker and we put load onto the breaker, watched the current draw. just with two 20hp 480 pumps running in hand mode in my chiller plant the unit showing 70 amps, the red led would begin blinking, than go solid and the breaker would trip after 30-40 seconds or so. We reset the breaker, started the chiller (and it's two water pumps) the inrush for the carriers motor was around 650amps per phase for a flash of a second, settling to 180amps per phase, the red LED would flash (90% draw) and than solid red(overload warning) and the breaker would trip. They adjusted trip curve more and more and each time, the breaker would trip.
Their supplier has agreed to absorb the cost of the bad/failed refurbished breaker and recommended a brand new R-series Breaker. This is requiring a retrofit to properly bolt into the 40 year old Square D enclosure. Everything was mocked up this morning and our utility provider is on schedule for a planned outage this Saturday for us to go offline and the breaker vendor will be swapping and installing the new R-series unit. We are paying for the retrofit kit, the cost is very little in the grand scheme of things.
I am SO very hopeful this is the end of this. I will keep you all updated!
-M
After many weeks and several more attempts, the breaker company deemed the trip unit/logic unit bad on the P series breaker they sold to us. a digital ammeter was installed into the face of the breaker and we put load onto the breaker, watched the current draw. just with two 20hp 480 pumps running in hand mode in my chiller plant the unit showing 70 amps, the red led would begin blinking, than go solid and the breaker would trip after 30-40 seconds or so. We reset the breaker, started the chiller (and it's two water pumps) the inrush for the carriers motor was around 650amps per phase for a flash of a second, settling to 180amps per phase, the red LED would flash (90% draw) and than solid red(overload warning) and the breaker would trip. They adjusted trip curve more and more and each time, the breaker would trip.
Their supplier has agreed to absorb the cost of the bad/failed refurbished breaker and recommended a brand new R-series Breaker. This is requiring a retrofit to properly bolt into the 40 year old Square D enclosure. Everything was mocked up this morning and our utility provider is on schedule for a planned outage this Saturday for us to go offline and the breaker vendor will be swapping and installing the new R-series unit. We are paying for the retrofit kit, the cost is very little in the grand scheme of things.
I am SO very hopeful this is the end of this. I will keep you all updated!
-M
