82 Planning the electrical installation
Customer wiring
The insulation monitoring device can be connected to external systems. See the circuit
diagrams delivered with the inverter.
Start-up
See chapter Start-up.
More information
• Circuit diagrams delivered with the inverter
• Manufacturer’s operating manual of the insulation monitoring device
Implementing positive or negative pole grounding
(options +F282 and +F283)
Some solar module types require positive or negative grounding. Make sure that the
optional positive (+F282) or negative (+F283) grounding method is suitable for the solar
modules that you are using.
Ground the panels during long maintenance breaks if the panel type requires it.
Limiting the conducted disturbances with the EMC filter
(option +E216) in low-voltage TN (grounded) networks
The optional EMC filter (+E216) can be installed at the network-side of the low voltage
transformer to limit the conducted disturbances to other equipment connected to the
network. The filter has capacitors connected to ground and is not suitable for IT
(ungrounded) networks. Ensure that the network owner and operator allows the
installation of this kind of a filter. The filter must always be installed according to local
regulations.
Instructions for inverters delivered without input DC
fuses (option +0F291)
If the standard input DC fuses are not suitable for the customer application, the inverter
can be delivered without input DC fuses (option +0F291). In this case, install appropriate
DC fuses to protect the inverter DC circuit and the DC input cables in a short-circuit
situation. Protect the positive and negative poles of an input with separate fuses. The
power loss of a fuse may never exceed 25 W.
The table in section Fuses for inverters delivered without input DC fuses (option +0F291)
(page 130) shows the rated DC current for selecting the input DC fuses.
Mechanical installation of the input DC fuses
Use M10 or M12 bolts and nuts to connect the fuses to the busbars.
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