Service manual

www.enc.net.cn/en Tel/Fax:[phone] installation and wiring
26
(3) Connection between inverter RS485 interface and upper machine(with RS232
interface):
Fig. 3-16 RS485 communication wiring
(4) Multiple inverters can be connected together per RS485 and 31pcs inverter
can be connected together at most. Communication system is more prone to
disturbance as connected inverters increasing, following wiring is
recommended:
Fig. 3-17 recommended wiring for multiple inverters communication (all
inverters and motors well earthed)
Normal communication still not available if using above wiring, can try to take
following measure:
1> Provide separate power supply for PLC (or upper machine) or isolate its
power supply.
2> Apply magnetic circle on the communication wire.
3> Reduce inverter carrier wave frequency properly.
RS232/RS485 converter
Signal Pin no.
PE shell
RXD 2
TXD 3
GND 5
DTR 4
DSR 6
RI 9
CD 1
RTS 7
CTS 8
Terminal explain Name
5Vpower positive +5V
Sending data line TXD
Receivingdata line RXD
5VPower ground GND
Name Terminal explain
B Signal negative end
A Singnal positive end
Terminal explain Name
Signal negative end B
Signal Positive end A
Shielded
cable
EDS1000
CPU board
Mainframe
A B
PE
EDS1000
CPU board
Submachine
EDS1000
CPU board
Submachine
A B
PE
A B
PE
……
(1) When form the network only by inverters, you must set local address parameter
F2.15 of the mainframe EDS1000 to 0.
(2) For programming of RS485 interface，please refer to chapter 11 MODBUS
communication protocol.
note