PVI 23TL, 28TL Installation and Operation Manual (Rev J)
DOCR-070365-J
Page
35
of
66
Star or T Modbus (RS-485) network topologies should always be avoided. See Figure 7.3.
Figure 7.3
It is important to daisy chain the inverter Modbus (RS-485) connections to minimize noise and bus
reflections. Any network topologies shown to the left should be avoided. Equivalent daisy chain
topologies shown to the right should be used instead.
Connecting External DAS Modbus (RS-485) Network to the PVI 23-28TLInverter:
Warning:
Risk of Electric Shock.
Make sure all DC and AC power to the unit has been disconnected before opening the inverter
wiring box and make sure hazardous high voltage and energy inside the equipment has been
discharged.
1.
Open the inverter wiring box.
2.
Bring the cable into wiring box through knockout holes at the bottom.
3.
Connect the Modbus (RS-485) wires to the green Phoenix connector (P208) ensuring correct
polarity and using a twisted pair in the shielded twisted pair cable.
