SMA SC 500HE-20 - Manual (Page 11)

SMA Solar Technology AG 2 Safety
Operating Manual SCxxxHE-20-BE-BEN111210 11
2 Safety
2.1 Intended Use
The Sunny Central is a central inverter which converts the direct current from PV modules into
alternating current. The maximum permissible DC input voltage of the inverter must not be exceeded.
The Sunny Central is suitable for indoor installation provided that the specified safety distances are
maintained. The enclosure complies with the IP21 degree of protection. IP21 means that the closed
inverter is protected against vertically falling dripping water. The inverter is classified under Class
3 C1L according to EN 60721-3-3.
Inverters of the HE series may only be operated in conjunction with a suitable transformer. The
transformer must be designed for the voltages that arise during pulsed inverter operation. The voltages
can reach a magnitude of maximum ±1 450 V to ground. (see the "Medium-voltage Transformer"
Technical Information at www.SMA.de/en).
Settings that affect grid management may not be disabled or modified without first obtaining approval
from the grid operator.
Figure 1: Principle of a grid-tie PV plant with an inverter
Position Designation
A PV modules
B DC sub-distribution box (e.g. Sunny String-Monitor)
C Sunny Central
D Medium-voltage transformer (e.g. Transformer Compact Station)
E Power distribution grid