Chapter 2 Installation and Wiring
25
If several inverters (Max 31) are connected in the network by RS485, wiring is
especially important because the disturbance to the communication system increases,
STP (Shielded Twisted Pair) must be used for communication BUS, you can connect the
cables as follows:
Fig. 2-18 Communication between PLC and the Inverter
(The Inverter and Motor are grounded well)
The master can be a host PC or a PLC, the slaves are inverters of this series. An
RS232/RS485 converter should be installed between the master and the bus when a PC
is used. Connect homonymy terminals of the master and slave if the master is PLC.
When several inverters of S2R4GB~3004GB/35R5PB formed the RS485 network, you
should customize the matching resistor of the inverters on those control panels which
are on both ends of the farthest of the bus according to the use.
When several inverters of 35R5GB/37R5PB~3500G formed RS485 network, you
should dial SW4 (double switches) of the farthest inverter to “ON”, as Figure 2-19.
1 2
ON
RS485
SW4
Fig. 2-19 Switches of SW4
If the communication still can’t work, then the following actions can be taken:
1)Feed a separate AC supply to PLC (or host PC) and isolate the AC supply;
2)If RS232/RS485 converter is used and the module should be powered by a separate
power supply, converter with optical-isolator is recommended;
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