74 Product manual - PVS-175-TL;A.1 Version
EN
5.8 Input connection (DC)
After the preliminary checks and therefore having verified that there are no problems in the photovoltaic
system, you may connect the inputs to the inverter.
WARNING – B Comply with the maximum input current relating to the quick-fit connectors as
indicated in the technical data.
WARNING – B The reverse polarity can cause severe damage and electric arc hazards! In case of
reverse input strings do not disconnect them while under load and do not turn the DC disconnect
switches (19) to OFF position. Wait until input current are below 0.5A (when solar irradiance
declines at night) and turn the DC disconnect switches (19) to OFF position, disconnect the DC
input quick fit connectors (18) and correct the wrong polarity of the string.
WARNING – B When the photovoltaic panels are exposed to sunlight they provide continuous
DC voltage to the inverter. To avoid risks of electrical shock, all wiring operations must be
carried out with the DC disconnect switches (internal (19) and external to the inverter) and AC
disconnect switches (internal (09) or external to the inverter) OFF.
WARNING – B The inverters referred to in this document are TRANSFORMERLESS. This type
requires the use of insulated photovoltaic panels (IEC61730 Class A Rating) and the need to
keep the photovoltaic generator floating with respect to ground: no terminal of the generator
must be connected to ground.
For the string connections it is necessary to use the DC input quick fit connectors (18) located on the left
side of the wiring box.
The models of the counterpart for quick fit connectors to be used to connect the input strings are shown
in the table below:
Type Manufacturer Model P/N
Conductor cross
section
Ø cable gland
Male Stäubli PV-KBT4-EVO 2
32.0087P0001-UR
4 - 6 mm² 4.7 - 6.4 mm
32.0089P0001-UR
4 - 6 mm² 6.4 - 8.4 mm
32.0093P0001-UR
10mm² 6.4 - 8.4 mm
Female Stäubli PV-KST4-EVO 2
32.0086P0001-UR
4 - 6 mm² 4.7 - 6.4 mm
32.0088P0001-UR
4 - 6 mm² 6.4 - 8.4 mm
32.0092P0001-UR
10mm² 6.4 - 8.4 mm
ATTENTION – A According to IEC 62548 (Photovoltaic (PV) arrays – Design requirements),
connectors mated together in a PV system shall be of the same type from the same manufacturer,
i.e. a plug from one manufacturer and a socket from another manufacturer or vice versa shall
not be used to make a connection.
ATTENTION – A Using mating parts that are not compliant with the quick fit connector models
on the inverter could cause serious damage to the unit and lead to invalidation of the warranty.
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