4. Operations on External AC switches
The diagram below represents a possible arrangement of the PV plant.
Depending on the design choices made by the developer of the plant
some of the devices could not be present. Identify the external AC
switch(es) in the plant with the support of the plant manager.
PV Strings
External DC
Switch
INVERTER 1
(Unit under service)
OPEN+LOTO
PV Strings
External DC
Switch
INVERTER 2
External LV
AC Switch
External Main LV
AC Switch
External LV
AC Switch
LV Distriubution
Panel
MW Switch
LV/MW
Transformer
Internal DC
Switch
Internal DC
Switch
• Open the external AC disconnect switch or the main external AC
disconnect switch (blue in below picture) outside the inverter (IEC
60364-7-712.536.2.2). In case none of the LV AC switches are
present, the MV switch must be opened.
• Afx designated lock preventing operation onto any external AC
disconnect device, afxing designated tags (LOTO procedure).
Identication of the external switch may require the cooperation of the plant manager and it
must be included in the switching plan dened during the preparation of the work.
• Check on the status LEDs
06
the shutdown command has been
carried out (Missing Grid status):
- Power LED (Green): Flashing
- Alarm LED (Yellow): ON (solid)
- GFI LED (Red): OFF
- WLAN/LAN LED (Blue): Depends by the communication
status.
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