Planning The Connection Of The Solar Modules (Dc); Safety Instructions; Polarity Of The Dc Voltage - Delta M70A 260 Installation And Operation Manual

5 Planning the installation

Planning the connection of the solar modules (DC)

5.5 Planning the connection of the solar
modules (DC)
Related Topics
"7.12 Connecting the solar modules (DC)", page 97

5.5.1 Safety instructions

DANGER
Electric shock
Potentially fatal voltages are present at the DC
connections of the inverter. When light falls on
the solar modules, they immediately start to
generate electricity. This also happens when
light does not fall directly on the solar modules.
► Never disconnect the inverter from the solar
modules when it is under load.
► Turn both DC isolating switches to the OFF
position.
► Disconnect the connection to the grid so that
the inverter cannot feed energy into the grid.
► Disconnect the inverter from all AC and DC
voltage sources. Make sure that none of the
connections can be restored accidentally.
► Ensure that the DC cables cannot be
touched accidentally.
NOTICE
Incorrectly dimensioned solar system
If the solar system is dimensioned incorrectly,
this may damage the inverter.
► When calculating the module string, always
pay attention to technical specifications of
the inverter (input voltage range, maximum
input current and maximum input power, see
"13. Technical Data", page 198).
NOTICE
Overheating of the DC connections
Exceeding the maximum input current can
cause the DC connections to overheat and
result in a fire.
► When dimensioning the module strings,
always take into account the maximum input
current of the DC connections (see "13.
Technical Data", page 198).
NOTICE
Ingress of moisture
Moisture can enter via open DC connections.
► To ensure protection degree IP65, close un-
used DC connections with the rubber plugs
that are attached to the DC connections.
40
Before connecting the solar modules, turn both DC isolating
switches to the OFF position.

5.5.2 Polarity of the DC voltage

► Check the polarity of the DC voltage of the DC strings be-
fore connecting the solar modules.
The inverter has an integrated function for detecting reverse
polarity on the DC side. If such reverse polarity is detected, the
inverter triggers an error message. This error message is indi-
cated by the alarm LED as soon as the inverter is switched on.
Installation and Operation Manual for Solar Power Inverter M70A EU V2.0 EN 2020-08-03