Disconnecting The Inverter From Voltage Sources - SMA SUNNY BOY 3.8-US Instructions D'installation

8 Disconnecting the Inverter from Voltage Sources

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.
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. 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 with a Torx screwdriver (TX
25) and remove the enclosure lid carefully towards the front. 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.
60 SBSxx-US-10-IA-xx-11
SMA Solar Technology America LLC
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