SMA WB 5000A-11 Installation - Manual (Page 73)

SMA Solar Technology AG Troubleshooting
Installation Manual WB5A_6A-IA-IEN114540 73
3. Insert insertion tool into the openings of the terminal
contacts (1).
☑ This releases the terminals.
If you have not received an insertion tool for
operating the terminals together with the
replacement varistors, please contact
SMA Solar Technology AG. As an alternative, the
terminal contacts can be operated using a 3.5 mm
screwdriver.
4. Remove the varistor (2).
5. Insert the new varistor (3).
When reinstalling, the pole with the small loop
(crimp) must be mounted in terminal A (3).
6. Close the inverter as described in
Section 7.3 "Closing the Inverter" (page 59).
☑ Testing and replacement of the varistors is complete.
There is no conductive connection. The respective varistor is defective and must be
replaced.
Varistor failure is generally due to influences that affect
all varistors in a similar manner (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. You must
order replacement varistors directly from
SMA Solar Technology AG
(see Section 12 "Accessories" (page 83)).
• To replace the varistors, proceed to step 3.
NOTICE!
Destruction of the inverter as a result of defective varistors.
• Provide for replacement varistors immediately and replace the defective varistors.
• For systems with a high risk of overvoltage, do not operate inverters using faulty
varistors or no varistors at all.
Result Measure