10 Maintenance
Making preparations for maintenance work - disconnecting the inverter from the grid (AC) and solar modules (DC)
Installation and Operation Manual for Solar Power Inverter M70A EU V1.1 EN 2020-02-20
106
10.4 Making preparations for maintenance
work - disconnecting the inverter from
the grid (AC) and solar modules (DC)
The work instructions in this section apply to all
maintenance work.
Always start maintenance work with this section.
DANGER
Electric shock
Potentially fatal voltages are present in the
inverter during operation. When the inverter
is disconnected from all power sources, this
voltage remains in the inverter for up to 60
seconds.
You should therefore always carry out the fol-
lowing steps before working on the inverter:
1. Turn both DC isolating switches to the OFF
position.
2. Disconnect the inverter from all AC and DC
voltage sources and make sure that none
of the connections can be restored acciden-
tally.
3. Wait at least 60 seconds for the internal
capacitors to discharge.
There is normally an isolating switch (for example
in an equipment terminal box) between the
inverter and the grid and between the inverter
and the solar modules. This isolates the inverter
from all the AC and DC voltage sources and ren-
ders it de-energized.
Tools required
In addition to standard tools such as screwdrivers, open-ended
wrenches and socket wrenches in various sizes, the following
tools are required for work on the inverter:
● Voltmeter to check for the absence of voltage inside the
inverter
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