Ac Grid Connection - SMA MLX Serie Guia De Instalacion

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Installation
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2
Illustration 2.15 Loosen Front Screws and Lift Cover

2.6 AC Grid Connection

DANGER
These instructions for AC grid connection are for
qualified personnel only. To reduce the risk of electric
shock, do not perform any servicing other than that
specified in the operating instructions unless you are
qualified to do so.
CAUTION
For fuse and RCD information, refer to 5 Technical Data.
AC fuse rating must not exceed the ampacity of the
conductors used.
NOTICE
Wiring methods used shall be in accordance with the
National Electric Code, ANSI/NFPA 70, and the Canadian
Electrical Code, Part I.
Always observe local regulations.
All installers must observe the relevant wiring methods.
IMI Detection
The inverter has built-in IMI/RCMU (Insulation Monitoring
Interrupter / Residual Current Monitoring Unit). Certifi-
cation is according to the UL 1741 for Non-Isolated EPS
Interactive PV Inverters. The IMI/RCMU circuit is 100%
single fault immune. It acts on a continuous ground fault
current and a sudden change in the ground fault current.
This functionality is running during normal operation.
16
Insulation Resistance Detection
The inverter has a built-in Insulation Resistance Detection /
ISO circuit, which is certified according to the UL 1741 for
Non-Isolated EPS Interactive PV Inverters. The Insulation
Resistance Detector performs a measurement of the
connected PV system resistance to ground before the
inverter connects to the grid. If the resistance is below the
grid code set value, the inverter will wait and re-measure
the resistance after a short while. When the resistance is
above the grid code set value, the inverter performs a self-
test and connects to the grid.
Illustration 2.16 Installation Area
Illustration 2.17 AC Cable Wire Strip
The MLX inverter must only be connected to a 3-phase
grid.
L00410644-01_2q / Rev. date: 2014-06-02

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