SMA Solar Technology AG Troubleshooting
Installation Manual SB20HF-30HF-IA-IEN120431 75
4. Use a multimeter to ensure that all of the varistors in
the installed state have a conducting connection
between connectors B and C.
NOTICE!
Electrostatic discharges can damage the inverter.
The internal component parts of the inverter can be irreparably damaged by electrostatic
discharge.
• Ground yourself before touching a component part.
NOTICE!
Excessive voltages can destroy the measuring device.
• Only use measuring devices with a DC input voltage range up to at least 1 000 V.
Result Measure
☑There is a conducting
connection.
There is probably a different error in the inverter.
• Proceed to step 9.
• Consult the SMA Service Line for details on further
procedure.
☑There is no conducting
connection.
The respective varistor is defective and must be replaced.
Varistor failure is generally due to influences which affect all
varistors similarly (temperature, age, induced overvoltages).
SMA Solar Technology AG recommends replacing all
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 14"Accessories" (page93)).
• To replace the varistors, proceed to step 5.
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