SMA SB 1100LV - Manual (Page 48)

Replacing the varistors SMA Technologie AG
Page 48 SB1100LV-11:SE2006 Installation Guide
responses as a result of overvoltages. You can now check these varistors in the
following way, paying attention to the safety instructions in chapter 3 "Safety
instructions" (Page 9):
6. Using a continuity tester, check all the varistors to see if there is a conducting
connection between connectors 2 and 3. If there is not, then that varistor is not
working. The positions of the varistors in the Sunny Boy SB 1100LV can be seen
in the diagram in chapter 4.1 "Unit description" (Page 11).
8. Connect up the faultless PV generator strings to the inverter.
9. Reconnect the PE connection on the lid and close the Sunny Boy SB 1100LV.
7. Replace the varistor concerned with a new one
as shown in the drawing to the right. Ensure the
varistor is installed the right way round! If you do
not receive a special tool for operating the
terminal clamps with your replacement varistors,
please contact SMA. As an alternative, the
terminal contacts can be operated using a
suitable screwdriver. Since the failure of one
varistor is generally due to factors that affect all
varistors in a similar way (temperature, age,
inductive overvoltages), it is highly
recommended that you replace both varistors,
not just the one that is obviously defective. The
varistors are specially manufactured for use in
the Sunny Boy SB 1100LV and are not
commercially available. They must be ordered
directly from
SMA Technologie AG (SMA order
code: "SB-TV3").
Attention!
If no spare varistors are available on site, the Sunny Boy SB 1100LV can
once again feed into the grid. The input is no longer protected against
overvoltages! Replacement varistors should be obtained as soon as
possible. In systems with a high risk of overvoltages, the Sunny Boy SB
1100LV should not be operated with defective varistors!
10. Switch on the DC circuit breaker.
11. Switch the line circuit breaker to the "on"
position.
Insert the
special tool to
open the
terminal.
Remove the
varistor
The pole with the small loop
(crimp) must be fitted to
terminal 1 when replacing
the varistor.
On!