35/78 SUREWAVE SFC USER MANUAL
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External LV PSU feed
The 3-phase feed to the 24 Vdc power supplies (LV PSU) are normally fed internally by the input
supply for each cabinet as the expected incoming network supply is TN using output trans-
former (output side RFI floating).
In cases where the input side is not RFI grounded (e.g., no output isolation transformer), the
supply will have to be externally fed from 3-phase supply clean of common-mode noise, as per
LV PSU specifications.
External LV PSU feed
Code
Yes
Y
No
N
Table 7-12: SureWave SFC external LV PSU feed type code