3.3.1 AC Grid Types and Connections
The use of a Neutral (N) conductor is optional and depends the grid type and upon
local codes. The default AC Grid connection is 3Ø-3W. If a neutral is required,
this setting must be changed to 3Ø-4W via the front panel controls. The inverter
will operate from the following grid connections without need of an external
transformer:
Grid Type
480V/277V/ 3Ø-4W/Yg,
480V/277V/ 3Ø-4W/Y
480V/3Ø-3W/∆ (ungrounded)
ATTENTION
Inverter connection
3W or 4W +EGC
3W + EGC
3W +EGC
3.3.2 Required Protective Devices for M80U / M60U
North American electrical codes require a dedicated over-current device such
as a circuit breaker in line between the inverter and AC source.
Model Upstream circuit breaker
M80U ≧125A
M60U ≧100A
3.3.3 AC wiring preparation (all models)
Below is the procedure for preparing the AC conductors for connection to the
AC terminals (all versions):
• Ensure the AC conductors used are sized to the correct ampacity per NEC or
other local code. Refer to Figure 3-17.
• Strip off all wires for 14 mm [0.55in].
• The cross-sectional area for each AC conductor is 1~2/0 AWG.
• Please use the AC cable with temperature rating 90 °C or higher.
Figure 3-17: Size for AC conductors
L1
L2
L3
N
PE
Stripping length:
14 ~16mm [0.55~0.63in]
Conductor cross-section:
1~2/0 AWG (35 ~ 50mm²)
Conductor cross-section:
1~2/0 AWG (35 ~ 50mm²)
Conduit
to/from
AC Grid
39
Installation
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