Ac Grid Types And Connections; Required Protective Devices; Ac Wiring Preparation - Delta M30A 231 Operation And Installation Manual

3.3.1 AC Grid Types and Connections

The default AC Grid connection is 3Ø-3W. It can also connect 3Ø-4W with Neutral (N).
The inverter will operate from the following grid connections without need of an
external transformer:
TNC system
230/400V
TNS system
230/400V

3.3.2 Required Protective Devices

It is recommended to install an upstream AC line disconnection and over current
protection device. Please refer to your local rules for the required product.
The inverter integrates Residual Current Monitoring Unit (RCMU) for the detection
of residual current and does not require an external residual-current protective
device. However, if an external RCD is required by installation standard, a RDD/
RCBO of type A or B with rating 300mA should be used.

3.3.3 AC Wiring Preparation

The AC wires must be jacketed and meet the specifications in Table 3-2.
If there is any conflict with local electrical code, please follow the electrical code.
Size of each wire
13.3~25 mm² (6~4 AWG)
ATTENTION
TNC-S system
230/400V
L1
L2
L3
PE/N
M30A_231
TT system
230/400V
L1
L2
L3
N
PE
M30A_231
Table 3-2: AC wires requirement
Cable diameter
L1
L2
L3
N
PE
M30A_231
L1
L2
L3
N
M30A_231
23~31 mm
23
IT system
230/400V
M30A_231
Recommended Torque
2.5 N • m
Installation
L1
L2
L3