Sungrow SG250K3, Руководство по эксплуатации

Страница: 19 / 66

10
3. Commissioning
Chapter 3 describes the procedures needed to verify whether your installation of the
SG250K3 is correct and how to start the inverter for the first time.
3.1. Visual Inspection
To perform a visual inspection of theSG250K3:
1. Verify the grid circuit breaker is open.
2. Verify the DC circuit breaker is open.
3. Inspect the polarity of PV input connections are correct.
4. Check all the mechanical connections and make sure there is no damage,
scratch or abnormal parts
5. Check all the electrical connections and secure the wiring terminals.
Make sure the DC and AC side circuit breakers are switched-off.
6. Check all the wiring of AC and DC sides are connected to the correct
thermals with correct rating wires.
7. Make sure all the bolts that fix the wires are tightened and secured.
3.1.1. AC Connection Check
It must be verified that the inverter is connected to the correct grid type and that
a right-hand rotary field exists on L
1
, L
2
, and L3. The value of the AC line to line
voltage should be about 400 V.
3.1.2. DC Connection Check
The DC connections are from the DC combiner boxes to the inverter.
The voltage on the individual DC wires should be almost the same value and
must never exceed the allowable maximum DC voltage.
Besides the voltage values, the polarity of the DC inputs must also be verified. all
DC connections should be checked to ensure that they are
mechanically tight.
3.1.3. Ground Connection Check
Make sure the ground wire goes through the hole of the ground fault detection
device and connected to the ground copper bar securely.
3.1.4. Serial Communication Check (Optional)
For external communication monitoring, the data wires must be connected.
Make sure that the RS485 A and B wires are connected correctly and tightened to
the RS485/232 converter.
Make sure the RS485/232 converter DB9 terminal is correctly connected to the
PC DB9 serial port.