Grid Connection (Ac); Important Safety Instructions; Residual Current Circuit Breaker; Integrated Residual Current Monitoring Unit - Delta Electronics RPI M6A Installation And Operation Manual

5 Planning the installation

Grid connection (AC)

5.6 Grid connection (AC)

5.6.1 Important safety instructions

► Always follow the specific regulations of your country or
region.
► Always follow the specific regulations of your energy pro-
vider.
► Install all the stipulated safety and protective devices (such
as automatic circuit breakers and/or surge protection de-
vices).
Install all the stipulated safety and protective devices (such as automatic circuit breakers and/or surge protection devices).
► Protect the inverter with a suitable upstream circuit breaker:
Model
RPI M6A
RPI M8A
RPI M10A
G N L1 L2 L3
Fig. 5.6.: Position of the upstream circuit breaker

5.6.2 Residual current circuit breaker

Due to its design, the inverter cannot supply the grid with DC
residual current. This means that the inverter meets the require-
ments of DIN VDE 0100-712.
Possible error events were assessed by Delta in accordance with
the current installation standards. The assessments showed that
no hazards arise from operating the inverter in combination with
an upstream, type A residual current circuit breaker (FI circuit
breaker, RCD). There is no need to use a type B residual current
circuit breaker.
Minimum tripping current of the type A residual
current circuit breaker
The required tripping current of the residual cur-
rent circuit breaker depends first and foremost
on the quality of the solar modules, the size of
the PV system, and the ambient conditions ( e.g.
humidity). The tripping current must not, however,
be less than the specified minimum tripping cur-
rent.
28
Upstream circuit breaker
16 A
16 A
20 A
L3
L2
to the
L1
inverter
N
PE
≥ 100 mA

5.6.3 Integrated residual current monitoring unit

The integrated, universal current-sensitive residual current moni-
toring unit (RCMU) is certified in accordance with VDE 0126 1-1/
A1:2012-02 §6.6.2.

5.6.4 Cable requirements

The AC plug provided with the inverter has the following technical
characteristics:
Plug type
Nominal current
Min./max. Cable diameter
Min./max. Wire cross-section
Recommended torque for ter-
minal screws
The AC plug can only be used with a flexible copper cable.
Consider the following factors when calculating the cable cross-
section:
● Cable material
● Temperature conditions
● Cable length
● Installation type
● Voltage drop
● Loss of power in the cable
► Always follow the installation regulations for AC cables ap-
plicable in your country.
► France: Follow the installation instructions of UTE 15-712-
1. This standard contains the requirements for minimum
cable diameters and for avoiding overheating due to high
currents.
► Germany: Follow the installation instructions of VDE 0100-
712. This standard contains the requirements for minimum
cable diameters and for avoiding overheating due to high
currents.
► Australia/New Zealand: Follow the installation regulations
of AS/NZS 5033:2005. This standard contains the require-
ments for minimum cable diameters and for avoiding over-
heating due to high currents.

5.6.5 Grounding the inverter

The inverter must be grounded via the PE conductor. To do this,
connect the PE conductor of the AC cable to the AC plug pin
provided for the purpose.

5.6.6 Permissible grounding systems

Grounding system TN-S
Allowed Yes
Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
Amphenol C16-3
C016 20E004 800 2
≤ 25 A
11 / 20 mm
5/8 mm
2
≥ 0.7 Nm
TN-C TN-C-S TT IT
Yes Yes Yes No