SolarEdge SE-MTR240-NN-S-S1, Руководство по установке

Страница: 44 / 47

Appendix D: External Lightning Protection
Protection devices are most often installed from each data line to the local earth
ground, and should be selected to begin conducting current at a voltage as close to the
system's normal communication level as possible, but never lower. For RS485
communication lines, the selected voltage rating is typically 6-8 V. Transient
suppressors should be installed as close as possible to the port that is being protected,
and the user must provide an extremely low impedance connection to the local earth
ground of the SolarEdge device. This ground connection is crucial for proper
suppression device operation. The ground connection should be made using a heavy
gauge wire and kept as short as possible. If the cable between the SolarEdge device and
the protection device must be longer than 1m/3.3 ft., a copper strap or a braided cable
intended for grounding purposes must be used for the protection device to be
effective. In addition to the high frequency nature of transients, extremely high current
may flow.
A protective device with surge discharge ratings of In: 10kA 8/20 μ s and Imax: 20kA
8/20 μ s is recommended.
For further information, see the Overvoltage Surge Protection Technical Note:
https://www.solaredge.com/sites/default/files/lightning_surge_protection.pdf
Figure 23: Protection connection
Appendix D: External Lightning Protection 43
Energy Meter with Modbus Connection MAN-01-00270-1.3