Delta M250HV, Инструкции по установке и вводу в эксплуатацию

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23 Installation manual M250HV_112 (RPI254M112000) Product Version 0 EU V1.0 EN 2022-04-11
Connecting the grid
Important safety instructions
► Always follow the specific regulations of your country
or region.
► Always follow the specific regulations of your energy
provider.
►
Install all the stipulated safety and protective devic-
es (such as automatic circuit breakers and/or surge
protection devices).
►
We recommend that you install an upstream AC cable
isolating and overcurrent protection device. Please
check your local regulations for the protective equip-
ment you require.
Recommended upstream AC cable isolat-
ing device
250 A
PE L1 L3 L2
L1
L2
L3
PE
to the
inverter
►
Select the protective devices for the grid cables to
the transformer for the grid feed-in point: always take
into account the impedance between the PE of the
inverter and the system and/or operational ground of
the distribution network. This applies in particular for
IT networks.
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 requirements of DIN VDE 0100-712.
Possible error events were assessed by Delta in accor-
dance with the current installation standards. The assess-
ments 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 resid-
ual current circuit breaker
≥300 mA
The required tripping current of the residual
current circuit breaker depends first and
foremost on the quality of the solar mod-
ules, the size of the PV system, and the
ambient conditions (for example, humidity).
The tripping current must not, however, be
less than the specified minimum tripping
current.
Integrated residual current monitoring unit
The integrated universal current-sensitive residual current
monitoring unit (RCMU) is certified in accordance with
VDE 0126 1-1:2013-08 §6.6.2.
AC surge protection devices
The inverter is equipped with type 2 AC surge protection
devices. Replacements can be ordered from Delta Cus-
tomer Service. You can find the contact information on the
back of this document.
Permitted grounding systems
Grounding system TN-S TN-C TN-C-S TT IT
Allowed Yes Yes Yes Yes Yes
Grounding the inverter housing
The inverter can be grounded using the earth connections
on the outside (bottom left or bottom right).
Size Torque Parts required
M12 24.5 Nm
Screw, spring washer,
washer, toothed washer
M6 3.9 Nm
Table 4.2.: Size, torques and required parts of the earth connec-
tions on the outside
Alternatively, the inverter can be grounded using the PE
connection in the AC connection box.
Size Torque Parts required
M12 30 to 35 Nm
The screw, spring washer
and washer (mounted on
the inverter)
Table 4.3.: Size, torques and parts required for the ground con-
nections
Grid and system protection
1. German standard VDE-AR-N 4110 requires external
grid and system protection with a coupling switch for
PV systems greater than 30 kVA.
2. Alternatively, VDE-AR-N 4110 allows the use of an
inverter with an internal coupling switch when this
switch isolates the inverter from the grid in less than
100 ms.
This inverter meets the requirement in (2). An external
coupling switch is not required. This statement also applies
to medium-voltage systems.
General information