SMA SB 3300-11 Installation - Manual (Page 59)

SMA Solar Technology AG Troubleshooting
Installation Manual SB33-38-11-IA-en-62 59
You can check the functionality of the varistors in the following manner:
1. Open the inverter as described in section 7.2 "Opening the Inverter" (page 41).
2. Use a multimeter to ensure that all of the varistors in
installed state have a conducting connection
between the connectors B and C.
Result Measure
☑ There is a conducting connection. There is probably a different error in the inverter.
• Close the inverter as described in section
7.3 "Closing the Inverter" (page 43).
• Contact the SMA Service Line
(see section 13 "Contact" (page 72)).
☑ There is no conducting
connection.
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
replacing all varistors.
The varistors are specially manufactured for use in
inverters and are not commercially available. You must
order replacement varistors 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.
• Provide for replacement varistors immediately and replace the defective varistors.
• Do not operate inverters with faulty varistors or no varistors at all in plants with a high
risk of overvoltage.