Installation guide

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Voltage measurement (X2)
Connect the positive pole from the PV string to the X2 connection.
Normally the negative pole of the PV Array voltage measurement at X2 is already internally connected with
the negative pole of the PV array; so no additional connection is required. If you only need to measure volt-
age from the PV string without connecting any current input or output, then connect the negative pole to the
X2 connection.
The negative of the X2 connector is electrically connected to the common output busbar, which is why its
non-connection does not affect the measurement. Under no circumstances must it be connected to any other
negative of the equipment. Connection of the negative of any of the strings to this point (X2 negative), may
damage the equipment.
The Maximum String Voltage for the Transclinic xi+ is 1000Vdc.
Physical connection specifications:
• Cross sectional Area:
With ferrules: from 0.5 to 10 mm²
Without ferrules from 0.5 to 16 mm²
• Tightening torque 1.2-1.5 Nm
• Stripping length/blade size:12mm/1.0 x 5.5
2.5 CPU Board Connections
2.5.1 Power supply (X7)
Connect an isolated 24Vdc Power Supply to the X7 connector as shown in the connection diagram. The
power supply voltage must be in the range 18-36Vdc. Power consumption is less than 1.5W.
Using a galvanically isolated supply in each string box is the recommended configuration. If you are running
a central 24Vdc power supply to several string boxes, be aware that PV plants are typically electrically noisy
environments and that power supply wiring is subject to the same noise currents, induced voltage surges
and common mode noise as any other cable.
Physical connection specifications:
• Cross sectional Area:
With ferrules: from 0.2 to 2.5 mm²
Without ferrules from 0.2 to4mm²
• Tightening torque 0.4-0.5 Nm
• Stripping length/blade size: 7 mm / 0.6 x 3.5
2.5.2 Data Communications (X1 and X3)
Wire the Modbus line to connectors X1 and X3. Two connectors are provided so that the RS485 trunk cable
can be daisy chained through the unit and this is the recommended configuration. Stub connections can also
be used to connect the units to the trunk but their lengths must be kept very short (centimeters not meters
long).
RS485 networks have connections called signal grounds that are used to provide a reference point for signal
voltages. These are NOT related to the (typically very noisy) ground/earth points used in electrical circuits
and the two must never be connected.
For more information about Data communications and Modbus specification see the relevant sections of this
manual.
Physical connection specifications:
• Cross sectional Area:
With ferrules: from 0.2 to 2.5 mm²
Without ferrules from 0.2 to4mm²
• Tightening torque 0.4-0.5 Nm
• Stripping length/blade size: 7 mm / 0,6x3,5