Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-114
Connection
As illustrated below, connect the inverters in parallel to the external control system, and connect the RP and SN
terminals with a jumper on the inverter at the end of the network. (Similarly jumper the RP and SN terminals
when only one inverter is connected to the external control system for RS485 communication.) Connecting the RP
and SN terminals enables the terminating resistor in the control circuit terminal block board of the inverter, which
suppresses signal reflections.
(2) Required settings
The following table lists the inverter settings required for the RS485 communication:
Item
Function code
Data or range of data
Description
Communication speed
selection
C071
02
Loopback test
03
2,400 bps
04
4,800 bps
05
9,600 bps
06
19,200 bps
Node allocation
C072
1. to 32.
Assignment of a station number to the
inverter
(Set this item when your inverter is
connected together with other(s) to a
control system.)
Communication data length
selection
C073
7
7 bits
8
8 bits
Communication parity
selection
C074
00
No parity
01
Even parity
02
Odd parity
Communication stop bit
selection
C075
1
1 bit
2
2 bits
Selection of operation after
communication error
C076
00
Tripping
01
Tripping after decelerating and stopping the
motor
02
Ignoring the errors
03
Stopping the motor after free-running
04
Decelerating and stopping the motor
Communication trip limit time
setting
C077
0.00 to 99.99 (s)
Limit length of time to determine
communication train disconnection
Communication wait time
C078
0. to 1000. (ms)
Time to wait until the inverter returns a
response
Communication mode selection
C079
00
ASCII mode
01
Modbus-RTU mode
…
…
SP SN RP SN
External control
system
SP SN RP SN
SP SN RP SN