SMA SB 2500TL-21 Installation - Manual (Page 80)

Troubleshooting SMA Solar Technology AG
80 SB25-30TLST-21-IA-en-13 Installation Manual
6. Insert an insertion tool into the openings of the
terminal contacts.
7. Insert new varistors into the slots (as shown in the
diagram on the right).
Make sure that the labelling points to the left, i.e.
towards the insertion tool.
Result Measure
☑ There is a conductive connection. The varistor is functional. There must be a different error
in the inverter.
• Contact the SMA Service Line (see Section 15
"Contact" (page 92)).
☑ 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 replacing all 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 14 "Accessories"
(page 91)). Only use original varistors that are sold by
SMA Solar Technology AG.
• For replacing the varistors, proceed to step 6.