NF DP420LS Instruction Manual page 35

2. Preparation before Use
(a) When connecting the load with the neutral line (single-phase three-wire or three-phase
four-wire connection):
Connect the neutral point of load with the Lo terminal of each cabinet using cables with
same length and diameter as the voltage line. Alternatively, connect between the Lo
terminals of each cabinet by a cable which is as short as possible and has a diameter equal
to or more than that of the voltage line, and then connect one of the Lo terminals with the
neutral point of load by a cable with same length and diameter as the voltage line.
L1
16
L1 L2 L3 N
(a)Three-phase four-wire connection
L2
Load
(Cabinet ground terminal)
PROGRAMMABLE AC POWER SOURCE
L3