UPS Rectifier DC Output Voltage

[BillP]

Hello all,

Someone can help, I am connecting a new UPS Galaxy 5500 for the 1st time (This unit for the first time I mean), and during the commissioning paces I happened to measure the Rectifier output on the DC bus..gives 260VDC on open circuit (Battery Breaker OFF. The Battery bank is a 36 unit bank with12V batteries, nominal voltage 432VDC. I hesitated to connect the battery breaker QF1 on with such a disparity in voltage; is this normal?

Will the rectifier ramp up to the battery voltage? If not, will the battery higher voltage not damage the UPS/Rectifier?

Any ideas welcome and appreciated.

Thanks

[BillP · Accepted solution]

On 8/20/2019 8:52 AM, Geofrey said:

UPS Galaxy 5500

Its me again, just to add that the Unit is a 60kW capacity.

First time posting here and forgive if the topic or rules are not quiet perfectly followed by me yet