Ac Grid Types And Connections; Required Protective Devices - Delta M100A 284 Operation And Installation Manual

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:
TN-C
TN-S
* Make sure the voltage from L1, L2, and L3 to PE(Protection Earth) in IT system is
always in the range of ± 600V.

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.
Table 3-1: Recommended AC circuit breaker rating
Current rating
Voltage rating
Number of poles
*Should meet the installation requirement of local power system.
ATTENTION
TN-C-S
L1
L2
L3
PE/N
Inverter
TT
L1
L2
L3
N
PE
Inverter
L1
L2
L3
N
PE
Inverter
L1
L2
L3
N
Inverter
min. 200A
380V / 400V / 480V*
3 / 4
29
Installation
IT *
L1
L2
L3
Inverter