ABB UNO-DM-1.2-TL-PLUS-Q User Manual

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001004AG
8 - Maintenance
5. Operations on External DC switches (if present)
Note: 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 Strings
External DC
Switch
Internal DC
Switch
OPEN+LOTO
External LV
AC Switch
External Main LV
AC Switch
MW Switch
LV/MW
Transformer
OPEN+LOTO
INVERTER 1
(Unit under service)
PV Strings
External DC
Switch
INVERTER 2
External LV
AC Switch
LV Distriubution
Panel
Internal DC
Switch
• Open the external DC disconnect switch (blue in below picture)
outside the inverter (IEC 60364-7-712.536.2.2)
• Afx designated lock preventing operation onto any external DC
disconnect device, afxing designated tags (LOTO procedure).
Identication of the external switch may require the cooperation of the plant manager and it
must be included in the switching plan dened during the preparation of the work.
• Check on the status LEDs
06
the shutdown command has been
carried out (Missing DC voltage status): All LEDs OFF.
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.

ABB UNO-DM-1.2-TL-PLUS-Q Specifications

General

Brand	ABB
Model	UNO-DM-1.2-TL-PLUS-Q
Category	Inverter
Language	English