User and installation manual
8 Disconnecting the Inverter from Voltage Sources
SMA Solar Technology AG
Installation ManualSBSxx-US-10-IA-xx-1266
8 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.
NOTICE
Destruction of the measuring device due to overvoltage
• Only use measuring devices with a DC input voltage range of 600V or higher.
Procedure:
1. Disconnect the AC circuit breaker and secure it against reconnection.
2. Switch off the battery or the load-break switch of the battery (see documentation of the battery
manufacturer).
3. Wait five minutes. This will ensure that the capacitors are discharged.
4. 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.
5. Pull the ribbon cable connecting the LED assembly in
the enclosure lid to the communication assembly out
of the jack located on the communication assembly.
6. Ensure that no voltage is present at the fuses of the DC inputs between A+ and A- and
between B+ and B- as well as between C+ and C-. To do so, insert the test probe into the
screw points of the respective fuse.
7. Ensure there is no voltage on the AC-out terminal block between L1 and N and L2 and N
using a suitable measuring device. To do this, stick the test probe in each rectangular opening
of the terminal.
8. Ensure there is no voltage on the AC-out terminal block between L1 and the equipment
grounding conductor and L2 and the equipment grounding conductor using a suitable
measuring device. To do this, stick the test probe in each rectangular opening of the terminal.
ENGLISH