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Installation
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)
3.3.2 Required Protective Devices for M42/36/28U AC Grid
North American electrical codes require a dedicated over-current device such
as a circuit breaker in line between the inverter and AC source.
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 3-11.
• Strip off all wires for 14 ~16mm [0.55~0.63in].
• The cross-sectional area for each internal cable is 6~4 AWG (14~22mm²).
• Do not use copper-aluminum terminals.
Conductor cross-section:
6~4 AWG (14~22mm²)
Conductor cross-section:
6~4 AWG (14~22mm²)
* The PE wire is recommended to
use the same size (or the larger size)
as L1, L2, and L3.
(The maximum wire size is 2 AWG)
ATTENTION
Model
M42U
M36U
M28U
L1
L2
L3
N
PE
Stripping length:
14 ~16mm [0.55~0.63in]
Figure 3-11: Stripping guide for AC conductors
Inverter connection
3W or 4W +EGC
3W + EGC
3W +EGC
Upstream circuit breaker
≧75A
≧63A
≧50A
34
Conduit
to/from
AC Grid
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