SMA STP 10000TL-10 Installation - Manual (Page 86)

12 Troubleshooting SMA Solar Technology AG
86 STP10-17TL-IA-en-32 Installation Manual
4. Remove all varistors by pulling them upwards.
If you have not received an insertion tool for
operating the terminals with the replacement
varistors, contact SMA Solar Technology AG.
5. Use a multimeter to check each varistor for a
conductive connection between terminals 2 and 3.
Result Measure
☑ There is a conductive
connection.
Presumably there is a different error in the inverter.
• Proceed to step 8.
• Contact the SMA Service Line (see Section 16 "Contact",
page 111)
☑ There is no conductive
connection.
The respective varistor is defective and must be replaced.
Varistor failure is 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. You will need to order
replacement varistors directly from SMA Solar Technology AG
(see Section 15 "Accessories", page 110). Only use original
varistors that are sold by SMA Solar Technology AG.
• To replace the varistors, proceed to step 6.
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.
• In PV systems with a high risk of overvoltages, never operate the inverter without varistors.