Delta M100A 283

3.4.1 AC Grid Types and Connections
The default AC Grid connection is 3Ø-4W. It can also connect 3Ø-3W without
Neutral (N). The inverter will operate from the following grid connections without
need of an external transformer:
* Make sure the voltage from L1, L2, and L3 to PE(Protection Earth) in IT system is
always in the range of ± 600V.
ATTENTION
TN-C
Inverter Inverter
Inverter Inverter Inverter
L1
L2
L3
PE/N
TN-C-S
L1
L2
L3
N
PE
TT
L1
L2
L3
N
IT *
L1
L2
L3
TN-S
L1
L2
L3
N
PE
3.4.2 Required Protective Devices
Overcurrent protection device on AC wiring is recommended. Install a three-phase
AC circuit breaker that can protect the AC wiring of the inverter and safe for the
system maintenance. The below table shows the minimum requirement of the
AC circuit breaker.
Current rating min. 200A
Voltage rating 380V / 400V / 480V*
Number of poles
*Should meet the installation requirement of local power system.
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Table 3-1: Recommended AC circuit breaker rating
29
Installation