SMA 20000TL Service Manual - Manual (Page 11)

4 Retrofitting the Surge Arrester Type II
The inverter is equipped ex works with surge arresters or it can be retrofitted (see Section 14
"Spare Parts", page 43).
1.
Danger to life due to high voltages
• Disconnect the inverter from all voltage sources (see Section 2.2, page 7).
• Wait 20 minutes before you remove the DC protective cover to allow residual voltages to
discharge.
2. Release the screws on the DC protective cover
using an Allen key (AF 3), lift the DC protective
cover upwards from below and remove it.
3. Plug the new surge arresters into the designated
slots until they lock into place with the locking
tabs. The inspection window must be located on
the right-hand side.
4. Position the DC protective cover at the upper edge, flip down and tighten it (torque: 3.5 Nm).
4 Retrofitting the Surge Arrester Type II SMA Solar Technology AG
Service Manual for Installers 11 STP20-25TL-SG-en-11