Ac Grid Types And Connections; Required Protective Devices; Ac Wiring Preparation - Delta M15A-220 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
220/380V, 230/400V
TNS system
220/380V, 230/400V

3.3.2 Required Protective Devices

It is recommended to install an upstream circuit breaker between AC side and
inverter side for over current protection.

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
8~14 mm² (8~6 AWG)
ATTENTION
TNC-S system
220/380V, 230/400V
L1
L2
L3
PE/N
Inverter
TT system
220/380V, 230/400V
L1
L2
L3
N
PE
Inverter
Table 3-1: Recommended upstream protection
Model
M15A_220
M20A_220
Table 3-2: AC wires requirement
Cable diameter
L1
L2
L3
N
PE
Inverter
L1
L2
L3
N
Inverter
Upstream circuit breaker
30A max.
40A max.
23~31 mm
23
IT system
220/380V, 230/400V
Inverter
Recommended Torque
0.7 N • m
Installation
L1
L2
L3