SMA SUNNY MINI CENTRAL 4600A Installation Manual page 74

Troubleshooting
Result
☑ There is no conductive
connection.
NOTICE!
Destruction of the inverter due to overvoltage.
If varistors are missing, the inverter is no longer protected against overvoltages.
• Replacement varistors should be obtained as soon as possible.
• Do not operate the inverter without varistors in PV plants with a high risk of
overvoltages.
3. Insert an insertion tool into the openings of the
terminal contacts (1).
☑ This releases the terminals.
If you do not receive an insertion tool for operating
the terminals with your replacement varistors,
contact SMA Solar Technology AG. As an
alternative, the individual terminal contacts can be
operated using a 3.5 mm wide screwdriver.
4. Remove the varistor (2).
5. Insert the new varistor (3).
The pole with the small loop (crimp) must be fitted
to terminal A when replacing the varistor.
6. Close the inverter as described in section
7.3 "Closing the Inverter" (page 58).
☑ The check and replacement of the varistors is
completed.
74 SMC46-60A-IA-IEN120471
Measure
The respective varistor is defective and must be replaced.
Varistor failure is generally due to influences that affect
all varistors similarly (temperature, age, induced
overvoltage). SMA Solar Technology AG recommends
that you replace both varistors.
The varistors are specially manufactured for use in the
inverter and are not commercially available. They must
be ordered directly from SMA Solar Technology AG
(see section 12 "Accessories" (page 85)).
• To replace the varistors, proceed to step 3.
SMA Solar Technology AG
Installation Manual