Instructions Regarding Selection And Utilization Of Al-Cu Compression Joints; Connecting The Solar Modules (Dc); Safety Precautions - Delta M70A Installation And Operation Manual

5.4.14 Instructions regarding selection and utili-
zation of Al-Cu compression joints
When using aluminum cables with Al-Cu compression joints
(e.g. e.g. from Klauke, Elpress or Mecatraction) and heat-shrink
tubing, observe the following instructions.
► Select compression joints suitable for the type of cable that
is used.
► Comply with the installation instructions issued by the man-
ufacturer of the compression joints.
► Secure the cables with an external strain relief element.
Additional Al-Cu crimped connectors and heat-shrink sleeving are
required
Installation and Operation Manual for Solar Power Inverter M70A EU V1.1 EN 2020-02-20
5 Planning the installation

Connecting the solar modules (DC)

5.5 Connecting the solar modules (DC)
Further information
"7.11 Connecting the solar modules (DC)", page 88

5.5.1 Safety precautions

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.
ATTENTION
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 "11. Technical Data", page 144).
ATTENTION
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.
ATTENTION
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.
Before connecting the solar modules, turn both DC isolating
switches to the OFF position.
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