Sma MULTIFUNCTION RELAY User Manual download pdf (Page 10)

4 Electrical Connection SMA Solar Technology AG

10 MFR-NR-IA-en-21 Installation Manual

4 Electrical Connection

4.1 Safety during Electrical Connection

4.2 Electrical Connection Procedure

Danger to life due to high voltages of the PV array

When exposed to sunlight, the PV array generates dangerous DC voltage which is present in the

DC conductors and the live components of the inverter. Touching the DC conductors or the live

components can lead to lethal electric shocks.

• All work on the inverter must be carried out by qualified persons only.

• Prior to performing any work on the inverter, always disconnect the inverter from voltage

sources (see inverter manual).

• Do not touch any live components of the inverter.

Damage to the inverter due to electrostatic discharge

Touching electronic components can cause damage to or destroy the inverter through electrostatic

discharge.

• Ground yourself before touching any component.

Procedure See

1. Installation of the multifunction relay: Install the multifunction relay in

the inverter if it is not installed in the inverter upon delivery.

Section 4.4, page11

2. Selection of the operating mode: Select the operating mode in

which you want to use the multifunction relay.

Section 4.5, page17

3. Connection of the multifunction relay: Connect the multifunction

relay based on the operating mode and the corresponding wiring

diagram.

Section 4.6, page18

4. Change of the operating mode: Change the operating mode of the

multifunction relay if you do not want to operate the multifunction

relay in the operating mode Fault indication (FltInd) and do not

plan to connect a display to the multifunction relay.

Section 5, page24

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Sma MULTIFUNCTION RELAY User Manual Page 10