SMA WB 3600TL - Manual (Page 80)

Troubleshooting SMA Solar Technology AG
80 WB36TL_50TL-IEN102011 Installation Guide
12.2 Checking the Functioning of the Varistors
If the inverter displays event number "74", one of the varistors has probably lost its protective function
due to repeated stress.
Check the varistors as described below:
1. Disconnect the inverter as described in section 7.2 ”Disconnect the device from voltage
sources” (page 59).
2. Undo the screws of the top housing lid.
3. Pull the housing lid to the front at the bottom edge.
4. Push the housing lid to the top and remove it.
DANGER!
Danger to life due to high voltages in the inverter.
The capacitors in the inverter require 5 minutes to discharge.
• Wait 5 minutes before opening the housing cover, in order to allow time for the
capacitors to discharge!