Figure 3-34 RS485 Network Connection
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.
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 (network P7 and P9)
ensuring correct polarity and using a shielded twisted pair cable.
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