26
Code 240.010.0001
DLS 300 / 450 / 600
3 GENERAL DESCRIPTION
3.1
The DSL System
The DLS (see
Figure 00
) is a DC - AC solar inverter, designed to be used indoors. The system has been
designed to be used in combination with PV panels, to be connected to the national grid, and to a storage
battery to ensure optimal self-consumption. In the event of a temporary or permanent power outage, the
DLS will automatically enable the off-grid operation and will be able to produce back-up energy to the entire
residential system it is connected to. In addition, the DLS system is able to activate an auxiliary or emer-
gency generator to supply further back-up power. For more information, visit our web site www.delios-srl.it
All the adjustments and monitoring operations can be carried out on the LCD display (touch screen) located
on the front of the DLS.
3.2
Protective Devices
To ensure maximum performance, DLS systems have been designed without transformer, i.e. without gal-
vanic isolation between the DC input and the AC output. Therefore, in order to ensure a safe operation and
to comply with current standards even without an isolation transformer, the DLS systems have been fitted
with all the required safety devices, as described in the following paragraphs.
3.2.1 Anti-islanding
The DLS systems are equipped with an advanced anti-islanding protection system, i.e. with a protective
automatic disconnecting system that is enabled in the event of a grid power outage or of voltage and/or
frequency faults detected on the grid in order to avoid off-grid operation, which could be dangerous for the
members of staff who work on the grid and for the loads connected to it. The safety system is fully compliant
with the national relevant standards and legislation.
3.2.2 Earth Leakages of PV Panels
The DLS systems must be used with PV panels isolated by a ground wire (earth), i.e. with the positive and
negative terminals without direct connections to ground. To this effect, a built-in protective and monitoring
circuit constantly monitors the connection to ground and disables the DLS system when a fault is detected
on the system by immediately displaying the associated alarm through the graphic interface.
The DLS system can only be used with PV systems compliant with Class A specific requirements, in compli
-
ance with standard IEC 61730 requirements.
3.2.3 Converter Earth Leakages
The DLS systems are fitted with a residual current monitoring unit (
RCMU
) in compliance with the require-
ments of safety standard IEC/EN 62109-2. The device in question only protects the system from earth leak-
ages occurring upstream of the AC OUT terminals (i.e. towards the DC side of the PV system and therefore
towards the PV panels). Leakage currents that could occur in the AC section between the pick up/entering
point and the DLS are not detected and require an external protective device.
3.2.4 Automatic Interlock System (IT)
In order to allow the BACKUP operation (off-grid operation) if there is no power from the grid, the DLS
systems are fitted with a built-in automatic interlock device (dual electrical redundant interlock) compliant
with the requirements of standard CEI 0-21. The system is able to automatically separate the section of the
system made up of the DLS and the loads connected to it from the national grid allowing off-grid operation,
in compliance with the safety requirements of current standard.
Содержание DLS 300
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