User Manual 5 Electrical Connection
figure 5-8 Normally open contact
figure 5-9 Normally closed contact
Devices connected to the relay should comply with related requirements:
AC-Side Requirements DC-Side Requirements
Max. voltage: 230 Vac
Max. current: 3 A
Max. voltage: 24 Vdc
Max. current: 3 A
DI terminal (emergency stop dry contact)
The dry contact can be configured to be an emergency stop contact.
When the DI contact and PGND contact are shorted by external controlled switch (The external
switch can be configured as normally open contact or normally closed contact), the inverter
will immediately shutdown.
NS Protection
NS Protection is used for German market currently. For a plant with an installed power over
30kW, an external NS Protection Relay is connected to inverters that are connected to each
other with NS Protection terminals. When the grid runs abnormally, the status of the relay's
dry contact changes, and the inverters are emergently shut down.
NS Protection(including Passive Valid) can be set. When NS Protection is enabled on the
iSolarCloud, the inverters will operate normally when DI contact and PGND contact are shorted
by external controlled switch, and the inverters will emergently stop when DI contact and PGND
contact are disconnected.
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