Disconnecting The Inverter From Voltage Sources - SMA SUNNY TRIPOWER 5000TL Service Manual

3 Disconnecting the Inverter from Voltage Sources

3 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. It is important to always observe the prescribed sequence.
Destruction of the measuring device due to overvoltage
• Only use measuring devices with a DC input voltage range of 1,000 V or higher.
1. Disconnect the circuit breaker from all three line conductors and secure against reconnection.
2. Remove the ESS.
3. Loosen two screws of the protective cover using an Allen key (AF 5) and remove the protective
cover.
4. Use a current clamp to ensure that no current is present in the DC cables.
5. Release and remove all DC connectors. Insert a
flat-blade screwdriver or an angled screwdriver
(blade width: 3.5 mm) in one of the side slots
and pull the DC connectors straight out. Do not
pull on the cable.
6.
Danger to life due to high voltages
The capacitors in the inverter take five minutes to discharge.
• Wait five minutes before opening the enclosure lid.
7. Ensure that no voltage is present at the DC inputs of the inverter.
8. Unscrew all the screws of the enclosure lid using an Allen key (AF 5) and remove the
enclosure lid.
9. Use an appropriate measuring device to ensure that no voltage is present at the AC
connecting terminal plate between L1 and N, L2 and N, and L3 and N. Insert a test probe in
each round opening of the terminal.
10. Use an appropriate measuring device to ensure that no voltage is present at the AC
connecting terminal plate between L1 and PE, L2 and PE, and L3 and PE. Insert a test probe
in each round opening of the terminal.
11. Ensure that no voltage is present between any terminal of the multifunction relay and PE of the
AC connecting terminal plate.
8 STP5-12TL-20-SG-en-12
SMA Solar Technology AG
Service Manual