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Cod.: 240.010.0042
DLS / DLS-C Series
WARNING: During the maintenance charge, normal system functionalities are disabled, and the battery
cannot be used by the system. They are automatically restored at the end of the maintenance process.
WARNING: During the maintenance charge the EPS mode is disabled. It is automatically restored at the
end of the maintenance process.
WARNING: Maintenance charge is required by the battery integrated control module (BMS). The DLS
hybrid inverter cannot in any way disable the command from the battery.
The duration of the maintenance charge depends on the energy available from the solar panels and on the
health of the cells of the battery. This process can also take a long time (hours) especially during the winter
when the available solar energy can be very low.
The maintenance charge status is shown on the display status bar.
3.4 Protective Devices
To ensure maximum performance, DLS systems have been designed without transformer, i.e. without gal-
vanic isolation between the DC inputs (PV) and the AC outputs (AC OUT). Therefore, to ensure a safe ope-
ration and to comply with current standards even without an isolation transformer, the DLS systems have
been tted with all the required safety devices, as described in the following paragraphs.
3.4.1 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 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.
3.4.2 Earth Leakages of the PV panels
The DLS systems must be used with PV panels isolated from the protective conductor (earth), i.e. with the
positive and negative terminals without direct connections to ground. To this purpose, a builtin 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 inter-
face.
The DLS system can only be used with PV systems compliant with Class A specic requirements, in com-
pliance with IEC 61730 standard requirements.
3.4.3 Converter Earth Leakages
The DLS systems are tted with a residual current monitoring unit (RCMU) in compliance with the requi-
rements of IEC / EN 62109-2 safety standard. The device in question only protects the system from earth
leakages occurring upstream of the AC OUT terminals (i.e. towards the DC side of the PV system and the-
refore towards the PV panels). Leakage currents that could occur in the AC section between the PPC (Point
of Common Coupling) point and the DLS are not detected and require an external RCD.
3.4.4 Automatic Interlock Device
To allow operation in EPS mode (off-grid operation) in the case of a grid failure, DLS systems are equipped
with an embedded automatic interlocking device. The system can automatically separate the part of the
plant consisting of the DLS and the loads connected to it by the distribution network allowing operation
according to the safety requirements and relevant standards and legislation.
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