Sungrow SG25CX-P2 User Manual page 73

User Manual
DO terminal (fault output dry contact): The relay can be set to output fault alarms, and
user can configure it to be a normally open contact (COM＆NO).
Use LED indicators or other equipment to indicate whether the inverter is in the faulty state.
The following Figure shows the typical application of normally open contact :
• If an external load is added to the circuit, the current in the circuit cannot
exceed the load's maximum current carrying capacity.
• When an external AC source is connected to the circuit, for safety concern, the
pin pitch of R1 and R2 current-limiting resistors should be ≥ 8 mm respectively
(you may connect multiple resistors in series to meet the spacing
requirements). Also, consider whether the external loads' requirements for
currents can be met after R1 and R2 resistors are connected to the circuit.
Devices connected to the relay should comply with related requirements:
AC-Side Requirements
Max. voltage: 250 Vac
Max. current: 3A
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 stop.
NS terminal: NS Protection is used for German market currently. For plant sized more than
30kVA, inverter NS Protection terminals could be used in daisy chain to external NS
Protection Relay to realize emergency stop when NS Protection Relay change its dry
contact status due to the grid abnormal running status.
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.
figure 5-5 Normally open contact
DC-Side Requirements
Max. voltage: 30Vdc
Max. current: 3A
5 Electrical Connection
63