Sungrow SG20RT - NS Protection Connection

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step 7 Fasten the swivel nut.
step 8 Refer to section "5.10.3 Installing the COM Connector" to install the connector.
- - End
5.14 NS Protection Connection
NS terminal: NS Protection is used for the German market currently. For plants sized more
than 30kVA, inverter NS Protection terminals could be used in daisy chain to external NS
Protection Relay to realize emergency stop when the NS Protection Relay changes its dry
contact status due to the grid abnormal running status. For detailed assembling procedure
for inverters in daisy chain mode refer to section "5.10.2 Assembling the COM Connector".
For SG3.0–20RT, NS Protection(including Passive Valid) can be set. When NS-1 and NS-2
are connected, the inverters will emergently stop; otherwise, the inverters will operate
normally.
But if NS Protection is enabled on the iSolarCloud, refer to " NS Protection(Passive Valid)",
the inverters will operate normally when NS-1 and NS-2 are connected, and the inverters will
emergently stop when NS-1 and NS-2 are disconnected. See the table below for details.
table 5-6
NS-1 and NS-2 Inverter
NS Protection is disabled on
iSolarCloud
Shorted
Emergency stop
Disconnected
Normal operation
NS Protection is enabled on
iSolarCloud
Shorted
Normal operation
Disconnected
Emergency stop
The recommended wire conductor cross-section is 0.5 - 0.75 mm
2
,and the maximum wiring
distance of NS protection loop must be less than 100 m.
Refer to section "5.9.1 Assembling the COM Connector" for detailed assembling procedure.
Plug the wires to NS-1 and NS-2 terminals according the labels on the bottom of the inverter.
When terminals NS-1 and NS-2 are turned on by the external NS protection relay, the inver-
ter will stop immediately.
5 Electrical Connection User Manual