User Manual THEIA HE-t String Inverters 357115.013
,
Issue 1.0, 2011 April
37
If several inverters are connected together, all inverters must be connected to the CAN bus
before Start Up to benefit from single installation setup.
Jumper Position for Termination Resistance
With several inverters connected the jumper located behind the CAN terminal in Table 4.3.2
activates the termination resistance when the pins are short-circuited. This minimizes signal
reflections in the cables and helps to avoid interference.
• Single inverter: The two pins must be short-circuited (Default).
• Several inverters connected: The master-slave configuration requires short-circuited pins
on the first inverter and on the last inverter in the linked series. The pins must be
disconnected on the inverters between the first and last inverter in the linked series.
• To disconnect the pins, the jumper must be pulled up and placed only on one of the pins.
• Be careful not to bend the pins when removing or installing the jumper!
Table 4.3.2: Position of the jumper for the termination resistance
Connection Area From the side From above Pins
The pins are short-circuited.
The pins are disconnected.
4.3.7. Checks before Start Up
Check that the bracket and the inverter are correctly mounted and secured.
Check that all terminals are correctly torqued, and that all connectors and cable glands
are correctly tightened and sealed.
Verify that the PV open-circuit voltage (V
OC
) is below the limit of 600 V
DC
, and that
the DC polarity is correct.
Verify that the conductors on the AC side are correctly connected to the AC terminal
block.
Ensure that no cables interfere with the sealing of the inverter lower cover, and fasten
the cover firmly to the housing. Recommended tightening torque is 1.0 Nm / 0.74 ft-
lbf.
CAUTION: Ensure to tighten the inverter lower cover!
Verify that the lower cover is correctly secured so no moisture enters the housing
and damages the electronic components.
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