Maintenance 31
Isolation of DC the inputs
The DC inputs of a power section can be isolated from rest of the inverter using the
optional manual DC switch.
This mode can be used, for example, if work is done on the DC input cables outside the
inverter or at the junction boxes. Obey all applicable electrical safety procedures for
electrical work.
Note:
• Operation with isolated DC inputs requires that you open the optional manual
DC switch of the power section.
• The inverter automatically limits its output power to keep the total DC input
current of each power section below the limit.
• With high DC/AC power ratio, using the DC inputs of one power section to feed
both DC/AC inverter sections, the available DC power might not be fully utilized.
Work grounding
Open
-1Q1
-2Q1
-1Q2 -2Q2
-1Q3 -2Q3
-1F3
-T1
-2F3
-1T3 -2T3
-1LCL -2LCL
Closed
DC inputs isolated from
rest of the inverter
-1F1 -2F1
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