Delta RPI M6A

29
Installation and Operation Manual for RPI M6A M8A M10A inverters V1.0 2016-02-03
5 Planning the installation
5.8.3 Use with solar modules that have to be
grounded
NOTICE
Machine and equipment damage may occur.
► When the DC inputs are grounded, all strings
must be connected in parallel and then con-
nected to the inverters.
► Additionally, an external isolation transformer
must be installed to the AC side of the PV
system. Otherwise, damage will result and
the inverter will not work properly.
Depending on the DC connection type, different settings for insu-
lation problems detection have to be used, see “8.7 Insulation
mode and insulation resistance”.
1 - L1
2 - L2
3 - L3
4 - N
5 - PE
1 - L1
2 - L2
3 - L3
- PE
3P4W 3P3W
Z
Z
+
–
Distribution Box
Parallel DC inputs only
DC wiring
PV array
Positive grounding
Negative grounding
OR
Utility
3-phase, 230/400 V
AC
star or delta connection
Inverter
230/400 V
AC
Isolated
transformer
Fig. 5.15: System design with oating DC inputs