100 Start-up
Set up the cabinet heater (option +G300):
• Set the maximum temperature with the T65 thermostat (default
10 °C).
Note: Especially in very humid conditions when the inverter is
installed on the site for a longer period without grid connection
keep the cabinet heaters on for several days before
commissioning.
Choose the control mode by connecting the heater power supply
wire to one of the three terminals listed below:
• X5:3 = Heating is switched off by the T65 thermostat and when
the inverter is modulating.
• X5:4 = Heating is controlled by the K65 customer control relay
24 V DC control signal and by the T65 thermostat.
• X5:5 = Heating is only controlled by the T65 thermostat.
The optional cabinet heater has
three control modes (see circuit
diagram sheets 64 and 65 delivered
with the inverter). The control mode
can be selected by changing the
heater power supply wire in the
auxiliary control cabinet.
More information:
Circuit diagrams delivered with the
inverter
Check that it is light enough for the inverter to be able to feed
power to the AC power system (grid) once it is operating.
Note: There must be enough light so
that the solar generator is able to
feed power to the inverter. This
enables verifying that the inverter
functions properly. Parameter
settings can be done during the dark
hours. Also, the inverter modulation
can be tested without input power
from the photovoltaic arrays.
Check that the polarity and voltage of each connected DC solar
string is correct:
• Remove the inverter DC fuses.
• Measure that the plus pole is connected to the plus terminal
and the minus pole to the minus terminal and the voltage is
correct.
• Put the DC fuses back into their place.
Note: There should be a
record/document stating that the
polarity and voltage of each solar
string is correct.
Verify the expected DC voltage. Check that the open circuit DC
voltage from the solar generator lies within the allowed range of
the inverter (eg, 450…1000 V DC).
Note: The expected DC voltage can
be estimated by using the open
circuit voltage of the solar modules
and the number of modules in a
string.
SETTING UP THE INSULATION MONITORING DEVICE (options +Q954, +Q976
and +Q981)
Check that there is only one insulation monitoring device for the
inverter in the same galvanically connected IT system.
Note: Using more than one
insulation monitoring device in the
galvanically connected IT system will
cause false results in the insulation
measurement.
Check that the settings of the insulation monitoring device suit
the installation and agree with the local regulations. The trip limit
is adjusted to 30 kohm at the factory by default.
More information:
• Circuit diagrams delivered with the
inverter
• Insulation monitoring device
manufacturer’s operating manual
SETTING UP CURRENT TRANSDUCERS (option +G417) FOR ALL DC INPUTS
Adjust monitoring settings for DC current measurements. See the firmware manual.
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