REFU Elektronik GmbH REFUsol 40K / 46K-MV 29
Fig. 11: DC connection Phoenix Contact TW50
• Before connecting the PV strings an isolation measurement must be taken.
• Whenever it is switched on, the inverter automatically checks the insulation of the PV generator. If the
isolation resistance measurement is outside of the acceptable threshold, the inverter switches off
automatically. The inverter can only be started once the PV generator isolation error has been removed.
• Be absolutely sure to verify proper polarity when connecting the PV strings. Any inappropriate connection
of individual strings may damage the PV generator.
• The inverter is protected by an integrated polarity reversal protection diode.
• Install a strain relief for the DC connections.
The PV generator may not exceed the following operational characteristics under any circumstances!
Device type 40K 46K-MV 48K-UL
Max. DC voltage at each input
1000 V
Max. short-circuit current DC input 160 A
Max. DC operating current 84 A 82 A 84 A
NOTICE
Reverse currents are fault currents that only occur in PV arrays with paralleled
strings. Given short circuits of individual modules or cells in a module, the open
circuit voltage of the string in question can drop so far that the intact parallel strings
will drive a reverse current through the defective string. This may result in
significant heating and therefore to destruction of the string.
Therefore, each string must be separately protected by a string fuse. In the
event of a failure, this isolates the string from the intact strings so that
destruction is prevented.
Pos: 43 /Inverter M anuals/Insta llation/DC+AC Connection/8 42 @ 3\mo d_14787928 69180_641.docx @ 25746 @ 2 @ 1
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