SMA SUNNY BOY 3800 - Page 61

SMA Solar Technology AG Troubleshooting
Installation Guide SB33_38-IEN111851 61
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43).
2. Use a multimeter to ensure that all of the varistors in
the installed state have a conducting connection
between connectors B and C.
Result Measure
☑There is a conducting connection. There is probably a different fault in the inverter.
• Close the inverter as described in section
7.3”Closing the Inverter” (page45).
• Contact the SMA Serviceline (see section
13”Contact” (page73)).
☑There is no conducting
connection.
The respective varistor is defective and must be replaced.
Varistor 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72)).
• 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 faulty varistors.
• For systems with a high risk of overvoltage, do not operate inverters with faulty
varistors or no varistors at all.