65
If there are multiple inverters in the RS485 network, the selector switch S1 of the
last inverter in the daisy-chain should be in ON position, to have the 120Ω terminal
resistor enabled. The selector switch S1 of all other inverters should be in the OFF
position to disable the terminal resistor.
3.4.4. Communication Wiring
Instructions for wiring the communications of one or a network of inverters:
1. Open the inverter wiring box. Refer to Section 3.3.1 for instructions and
torque requirements when replacing cover.
2. Bring the communication cables into the wiring box through the provided
knockout holes at the bottom, using similar methods to the AC and DC wiring.
Conduit and knockouts must be sealed and water tight to maintain the NEMA
4X rating.
3. Connect the RS485 wires to the P7 connector ensuring correct polarity and
using a shielded twisted pair cable.
a. If connecting only one inverter, one network cable is required.
b. If connecting multiple inverters into a daisy chain network all inverters
but the last in the chain will require two cables terminated in the same
RS485 pin connector (input/output).
DANGER:
Disconnect the inverter from the AC grid and PV modules before
removing covers or opening the equipment. Wait at least 5 minutes
after disconnecting from the DC and AC sources before servicing or
maintaining the inverter. Ensure hazardous high voltage and energy
inside the inverter has been discharged prior to servicing.
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