SMA SUNNY BOY 1300TL - Page 55

SMA Solar Technology AG Failure Search
Installation Guide SB13_21TL-IA-IEN121060 55
2. Using a multimeter and with both varistors installed,
determine whether there is a conductive connection
between terminals B and C.
Result Measure
☑There is a conductive connection. There is probably a different fault in the inverter.
• Contact the SMA Serviceline (see section
12"Accessories" (page71)).
☑There is no conductive
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
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71)).
• To replace the varistors, proceed to step 3.
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 plants with a high risk of overvoltages.