Ac Grid Types And Connections; Required Protective Devices; Ac Wiring Preparation - Delta M70A-262 Operation And Installation Manual

3.4.1 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

3.4.2 Required Protective Devices

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

3.4.3 AC Wiring Preparation

• The cross-sectional area for each AC conductor is shown below.
• The information and notice of cable using is shown on next page.
Conductor cross-section:
Cu: 35 mm 2 (1 AWG) ~ 120 mm
Al: 60 mm 2 (2/0 AWG) ~ 120 mm
Stripping length: 20mm
ATTENTION
TNC-S system
230/400V
L1
L2
L3
PE/N
M70A
TT system
230/400V
L1
L2
L3
N
PE
M70A
Model
M70A_262
2 (250 kcmil)
2 (250 kcmil)
Figure 3-12: Size of AC conductors
L1
L2
L3
N
PE
M70A
L1
L2
L3
N
M70A
Upstream circuit breaker
150A max.
N
L3
L2
L1
PE
29
Installation
IT system
230/400V
L1
L2
L3
M70A
outer
jacket