Sungrow SG20RT - External Protective Grounding Connection

5
Smart energy meter interface
Reserved
External alarm interface, e.g. light indicator and/or buzzer
The external DC voltage should not be higher than 30 V and the current
not higher than 1 A.
Meter (B2, A2)
NS (NS-1, NS-2)
RSD (RSD-1, RSD-2)
Label
Description
RS485-1 (A1, B1)
RS485-3 (B3, A3)
For external Demand Response Enabling Device ("AU"/"NZ")
For Ripple Control
For inverter emergency stop
For inverter emergency stop
DO (NO, COM)
DRM (D1/5, D2/6, D3/7, D4/8, R, C)
1
4
C
ø5.3...7 mm
A: 40...50 mm
B: 7...10 mm for single-strand wire
C:
ø < 2.8 mm for single-strand wire
A
B
2
The connections for Meter (single inverter), DO, NS and DRM are the same. Take meter connection as an
example.

IT
3
RSD
RS485-3 Meter
RSD-1
NS-1
B2
NS-2
A2
RSD-2
D1/5
D2/6 D4/8
D3/7 R
C
NO
DO
COMA3B3
NS DRM
RS485-1
A1
B1
B = E + (2~3) mm
E
For multi-core multi-strand wire
For multi-core multi-strand wire
COM2
For inverter daisy chain
(Cannot be used simultaneously with COM1 port for WiNet-S/WiNet-S2)
2
0.5...1.0 mm
43