Download Installation Manual

SMA Solar Technology AG
Troubleshooting
11.4 Replacing the Surge Arrester Type II
If the inverter displays event number "83", one of the surge arresters is probably defective.
Surge arresters are wear parts. Their functional efficiency diminishes with age or following repeated
responses as a result of overvoltages. It is therefore possible that one of the surge arresters no longer
fulfills its protective function.
Since the failure of one surge arrester is generally due to factors that affect all surge arresters in a
similar way (temperature, age, inductive overvoltages), SMA Solar Technology AG recommends
replacing all surge arresters at once. The order numbers for both retrofit kits (one for input A, one for
input A and B) can be found in section 14 "Accessories" (page 132).
The procedure for replacing surge arresters is as follows:
1. Disconnect the inverter as described in section 8 "Disconnecting the Inverter" (page 70).
DANGER!
Danger to life due to high voltages in the inverter Death due to electric shock
There is residual voltage in the inverter. The inverter needs 10 minutes to electrically
discharge.
• Wait 10 minutes before you open the upper enclosure lid or the DC lid.
2. Unscrew the captive screws of the DC lid on the lefthand side of the connection area.
3. Lift the DC lid upwards and remove it.
96
STP8-17TL-IA-IEN112030
Installation Manual