SMA SB 4200TL Multi-String Installation - Manual (Page 35)

SMA Technologie AG Exchanging Varistors
Installation Guide SB4200TL-13:SE2006 Page 35
If you have found neither a ground fault nor a defective varistor there probably is a
fault in the Sunny Boy 4200TL Multi-String. Please contact the SMA hotline in this case
to discuss further proceedings.
9. If no replacement varistors are available on site
the Sunny Boy 4200TL Multi-String can also be
operated without them for a limited period of
time. To this end remove the varistors you have
found to be defective and equip the terminals
with a wire jumper between terminals 2 and 3
instead. The Sunny Boy 4200TL Multi-String is
then not protected against surge voltages!
For a limited period of time a defective
varistor can be replaced by a wire
between terminal 2 and 3.
The input port thus modified is no longer protected against surge
voltages! Equip the inverter with varistors again as soon as possi-
ble. The Sunny Boy 4200TL Multi-String should not be operated
without varistors in plants where is a high risk of surge voltages!
10. Reconnect the PE plug to the lid and close the
Sunny Boy 4200TL Multi-String again.
11. Connect the faultless strings of the PV panel. En-
sure correct allocation to strings.
12. Close off the unneeded DC input sockets using
the protective caps supplied in the accessories
kit.
13. Switch on the circuit breaker.
14. Check whether the LEDs of the Sunny Boy
4200TL Multi-String show trouble-free opera-
tion.
1 2 3
+ - + -
String A String B