Disconnecting The Inverter From Voltage Sources - SMA SB Series Replacement Manual

5 Disconnecting the Inverter from Voltage Sources

5 Disconnecting the Inverter from Voltage Sources
Prior to performing any work on the inverter, always disconnect it from all voltage sources as
described in this section. Always adhere to the prescribed sequence.
Danger to life due to electric shock when live components or DC conductors
are touched
When exposed to sunlight, the PV array generates dangerous direct voltage. Even if the DC
load-break switch of the inverter is in the O, position, there will be dangerous direct voltage
present in the DC conductors and on the DC-in terminal block in the Connection Unit. Touching
live DC conductors results in death or lethal injuries due to electric shock.
• If an external DC disconnecting switch is available, open the external DC disconnecting
switch.
• Leave the DC-in terminal block plugged into the Connection Unit and only touch it on the
black enclosure.
Destruction of the measuring device due to overvoltage
• Only use measuring devices with a DC input voltage range of 600 V or higher.
Procedure:
1. Disconnect the AC circuit breaker and secure it against reconnection.
2. Set the DC load-break switch of the inverter to O.
3. If the multifunction relay is used, switch off any supply voltage to the load.
4. Wait until the LEDs have gone out.
5. Unscrew all six screws of the enclosure lid of the Connection Unit and remove the enclosure lid
carefully towards the front (TX25). When doing so, note that the LED assembly in the
enclosure lid and the communication assembly in the inverter are connected via a ribbon
cable.
10 SBxx-1SP-US-41-PU-RM-xx-10
DANGER
NOTICE
SMA Solar Technology AG
Replacement Manual