D.C. Inverter Multi-variable Modular
38
4.8 External Electrical Wiring Diagram
Each unit should be equipped with a circuit breaker for short circuit protection and exceptional
overload protection. Besides, a main circuit breaker shall be prepared for IDUs and ODUs in order to
connect or disconnect power of the entire system.
4.8.1 External wiring diagram of a single unit
QF
L1
L2
L3
N
QF
QF
QF
QF
L1
L2
L3
N
PE
PE
L1 L2 L3 N
G1 G2
D1 D2
PE
PE
PE
PE
PE
PE
L1 L2 L3 N
L1 L2 L3 N
L N
D1 D2 H1 H2
D1 D2 H1 H2
D1 D2 H1 H2
Power
Power
Terminal Board XT1
(Power)
Terminal Board XT2
(Communication)
Terminal Board XT1
(Power)
Terminal Board XT2
(Communication)
Terminal Board XT1
(Power)
Terminal Board XT2
(Communication)
Terminal Board XT1
(Power)
Terminal Board XT2
(Communication)
IDU 1
(master module)
IDU 1
IDU 2
IDU n
Remote monitor
Wire
(resistance-matching)
Wired controller
Wired controller
Wired controller
Fig.52
Note: maximum number of IDU is based upon ODU capacity. For details, please refer to the
introduction of units’ combination.
