Metering – HP Parallel Uninterruptible Power System User Manual
Page 79
Communication 79
Metering
The Output and Load Receptacle meter readings differ between a parallel system and a standalone UPS. In
a parallel system, one UPS reads the Load Receptacle value for the total system (the others read zero), but
each UPS displays its own Output value. For example, in a two-unit parallel system with one Anderson load
connection for 12 kVA, the Load Receptacle current would read 12 kVA on one UPS and zero on the other
UPS, but the Output measurement would be 6 kVA on each UPS (half the total). In a standalone UPS, the load
can be connected from the outlet cord or the Anderson load connector. The Output measurement would be
the total load on the UPS, and the Load reading would be the portion supplied by the Anderson load
connector.