Connecting The Solar Modules (Dc); Safety Instructions; Special Tools Required; Polarity Of The Dc Voltage - Delta M125HV Installation And Operation Manual

5 Planning the installation
Grid connection (AC)
5.5

Connecting the solar modules (DC)

Related topics
"6.6 Connecting the grid (AC) and solar modules (DC)",
page 72

5.5.1 Safety instructions

DANGER
Electric shock
Potentially fatal voltages are present at the
inverter DC connections. When light falls on the
solar modules, they immediately start to gen-
erate 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 mains so
that the inverter cannot supply energy to the
mains.
► Disconnect the inverter from all AC and DC
voltage sources. Ensure that none of the
connections can be restored accidentally.
► Ensure that the DC cables cannot be
touched accidentally.
ATTENTION
Incorrectly dimensioned solar system.
An solar system of the wrong size may cause
damage to the inverter.
► Always pay attention to the technical speci-
fications of the inverter (input voltage range,
maximum current and maximum input
power) when calculating the number of solar
modules.
ATTENTION
Overheating of the DC connections.
Exceeding the maximum current can cause
overheating of the DC connections and result in
a fire.
► Always take into account the maximum cur-
rent of the DC connections when planning
the installation.
42
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.
Turn DC isolating switch 1 and 2 to the OFF position.

5.5.2 Special tools required

Mounting tool for disconnecting the DC
plug and the protective caps from the DC
connections. Included in delivery. Amphe-
nol part number: UTXTWA001.

5.5.3 Polarity of the DC voltage

► Check the polarity of the DC voltage of the DC strings be-
fore connecting the solar modules.
Installation and operation manual for Solar Power Inverter M125HV EU V1 EN 2019-07-19