Replace The String Fuses; Safety; Preparation; Replacing The String Fuses - Fronius String Control 250/30 DCD DF Instructions De Service

Replace the string fuses

Safety

Preparation

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Replacing the
string fuses
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WARNING! Work that is carried out incorrectly can cause serious injury and dam-
age. The following activities must only be carried out by trained and qualified per-
sonnel. Note the safety rules in these operating instructions.
WARNING! An electric shock can be fatal. Danger from DC voltage in PV mod-
ules.
- Make sure that both the input side and output side of the device are de-ener-
gised before starting any maintenance work.
- Never replace fuses while under load.
Break the connection to the incoming AC lines using the AC disconnecter for the in-
verter
Interrupt the solar module strings to the Fronius String Control 250/30 DCD DF
Put up a clearly legible and easy to understand warning notice to prevent opened/in-
terrupted connections being reclosed or switched on again
Check that there is no voltage in the solar module strings
Short circuit the solar module strings
Open the cover
Check the continuity of the fuse holder at the terminals
NOTE! Only use fuses that meet the correct fuse selection criteria to protect the
solar modules.
Fuse dimensions: diameter 10 x 38 mm
Determine and eliminate the cause of the faulty fuse
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