The redundancy warning level for paralleled UPS
nplus0 (1) indicates that there are no redundant units.
nplus1 (2) indicates that there is one redundant unit.
nplus2 (3) indicates that there are two redundant units.
nplus3 (4) indicates that there are three redundant units.
nplus4 (5) indicates that there are four redundant unit.
nplus5 (6) indicates that there are five redundant units.