Delta RPI-M8 Manual page 21

AC's wiring can be separated into 3-phase and PE (3P3W) or 3-phase, N, and
PE (3P4W). In figure 5-3, the connector has to connect to the inverter's AC plug.
After de-assembling, please follow the polarity to do the proper wiring. (This
product allows either positive or negative phase sequence. That means the
sequence of L1~ L3 can be adjusted; however, N and PE must be connected
correctly.)
Fix it
AC Plug
Inverter
Rotate to tighten the inserter
Figure 5-3 AC plug illustrationfor M8/ M10/ M12/ M15/ M15A/ M20/ M20A.
Rotate to loose the AC plug
Cable
Cable
1 : L1
2 : L2
3 : L3
4 : N
PE
: PE
L1
L2
L2
L1
L3
N
PE
N L3
Align the biggest latch of the AC plug and the socket
Socket
Inverter
Rotate to tighten the plug
Cable
AC plug
Rotate gland to
fix cable
Cable
20