Permitted Earthing Systems - Delta RPI Series Operation And Installation Manual

After wiring, installer should choose the AC connection type on the control
panel. About setting, please refer to 5.2.7 Install Settings.
The AC voltage should be as followings:
3P3W
L1-L2: 400 Vac ± 20%
L1-L3: 400 Vac ± 20%
L2-L3: 400 Vac ± 20%

4.2.2 Permitted earthing systems

Earthing system
Permitted
TT is not recommended. The voltage of N has to be very close to PE.
(difference <20 V
3P4W
L1-N: 230 Vac ± 20%
L2-N: 230 Vac ± 20%
L3-N: 230 Vac ± 20%
TN-S TN-C
Yes Yes
)
rms
27
TN-C-S TT
Yes Yes
Wiring
IT
No