EN
69
8.2.4.4 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 Arrays
External DC
Switch
Internal DC
Switches
Internal AC
Switch
INVERTER UNIT
(Unit under service)
OPEN+LOTO
PV Arrays
External DC
Switch
Internal DC
Switches
Internal AC
Switch
INVERTER UNIT
External LV
AC Switch
External Main LV
AC Switch
External LV
AC Switch
LV Distriubution
Panel
MV Switch
LV/MV
Transformer
• Open the external AC disconnect switch or the main external AC disconnect switch (blue in previous 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.
• Affix designated lock preventing operation onto any external AC disconnect device, affixing designated tags (LOTO procedure).
NOTE –
D
Identification of the external switch may require the cooperation of the plant manager and it must be included in the
switching plan defined during the preparation of the work.
• Check on the Synoptic
(03)
the shutdown command has been carried out (Missing Grid status):
- Power Icon (Green): Flashing
- Alarm Icon (Yellow): ON (solid)
- GFI Icon (Red): OFF
- WLAN/LAN Icon (Blue): Depends by the communication status.
8.2.4.5 Operations on External DC switches (if present)
NOTE –
D
In case of absence of External DC disconnect device skip this step.
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 DC switch(es) in the plant with the support of the plant manager.
PV Arrays
Internal DC
Switches
Internal AC
Switch
INVERTER UNIT
(Unit under service)
PV Arrays
External DC
Switch
Internal DC
Switches
Internal AC
Switch
INVERTER UNIT
External Main LV
AC Switch
External LV
AC Switch
LV Distriubution
Panel
MV Switch
LV/MV
Transformer
External DC
Switch
OPEN+LOTO
External LV
AC Switch
OPEN+LOTO
• Open the external DC disconnect switch (blue in previous picture) outside the inverter (IEC 60364-7-712.536.2.2)
• Affix designated lock preventing operation onto any external DC disconnect device, affixing designated tags (LOTO procedure).
NOTE –
D
Identification of the external switch may require the cooperation of the plant manager and it must be included in the
switching plan defined during the preparation of the work.
• Check on the Synoptic
(03)
the shutdown command has been carried out (Missing DC voltage status): All icons OFF.
NOTE –
D
The time needed for the complete shut-down of the LEDs depends by the input voltage of the inverter. The complete shut-
down of the LEDs may require some minutes.
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