Troubleshooting
SMA Solar Technology AG
34
SB3300TLHC-IEN094121
Installation Guide
2. Determine with the aid of a multimeter for both
varistors in the installed state whether a conductive
connection exists between connectors B and C
☑ If there is
no conducting connection
, then that
varistor is not working.
3. Replace both varistors, as illustrated in the adjacent
drawing, with new ones.
Ensure the varistor is installed the right way round!
If you do not receive a special tool for operating the
terminal clamps with your replacement varistors,
contact SMA Solar Technology. As an alternative,
the terminal contacts can be operated using a
suitable screwdriver.
Since the failure of one varistor is generally due to
factors that affect all varistors in a similar way
(temperature, age, inductive overvoltages), it is
highly recommended that you replace both
varistors. The varistors are specially manufactured
for use in the Sunny Boy and are not commercially
available. They must be ordered directly from SMA
Solar Technology (see section 12 ”Accessories”
(page 39)).
4. Close the Sunny Boy as described in section 7.2 ”Closing the Sunny Boy” (page 30).
If no ground fault and no defective varistor were found, there is probably a fault in the Sunny Boy. In
this case, contact the SMA Serviceline to discuss what to do next.
NOTICE!
The Sunny Boy could be irreparably damaged by overvoltage!
If varistors are missing, the Sunny Boy is no longer protected against overvoltages.
• Replacement varistors should be obtained as soon as possible.
• The Sunny Boy must not be operated
without varistors
in systems with a high risk
of overvoltages.
Insert the special tool to
open the terminal clamp
Remove the varistor
The pole with the crimp
must be fitted to terminal A
when reassembling.
