C Flexy 205 Isolation Scheme; Base Unit; Extension Cards - HMS Networks Ewon Flexy 205 Installation Manual

Appendix C: Flexy 205 Isolation Scheme
C Flexy 205 Isolation Scheme
C.1

Base Unit

Connector shielding
Ethernet signals
Fig. 18 Isolation Scheme for the Base Unit
Based on the above picture:
• External and internal power supplies are isolated from each other (1.5kV)
• DI signals: isolated from DO signals, PGND and DGND (optocoupler)
• DO signals: isolated from DI signals, PGND and DGND (optocoupler)
• Earth is isolated from external and internal power supplies
C.2

Extension Cards

C.2.1 FLB 320x – Cellular
DGND = GND RF from SMA connector
C.2.2 FLX 3101 – WAN Ethernet
Connector shielding: Earth connected
Ethernet signals: isolated from DGND with a transformer
Flexy 205 Installation Guide
Flexy 205
Earth connected
Isolated from DGNG with a transformer
Serial ports GND = DGND
Avoid external connections between GND RF and Earth.
30 (32)
IG-0028-00 1.3 en-US