SMA Solar Technology AG
Troubleshooting
Installation Guide
SB11_17-IEN084820
37
3. Replace both varistors, as illustrated in the adjacent
drawing, with new ones.
– Insert an extractor tool into the openings of the
terminal contacts (1).
☑ The terminals will loosen.
– Remove the varistor (2).
– The pole with the small loop (crimp) must be
fitted to terminal A (3) when remounting.
Varistor failure is generally due to influences which
affect all varistors similarly (temperature, age,
induced overvoltage). It is therefore strongly
recommended that you replace both varistors.
If you did not receive an extractor tool together with
the replacement varistors for the servicing of the
terminals, contact SMA Solar Technology. The
terminal contacts can also be provisionally serviced
by a screwdriver with a 3.5 mm blade width. In the
process, pay attention to the correct orientation of
the varistors!
4. Close the Sunny Boy as described in section 7.2 „Closing the Sunny Boy“ (32).
☑ The check of the varistors is now complete.
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.
•
Do not
operate the Sunny Boy without varistors in systems with a high risk of
overvoltages.
