Hitachi SJ700D-004L, Instruction Manual

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Chapter 4 Explanation of Functions
4-115
(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
07 38,400 bps
08 57,600 bps
09 76,800 bps
10 115,200 bps
Node allocation C072 1. to 247.
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
*) In case Modbus-RTU mode is activated in communication mode selection(C079), internal setting of communication
data length selection become 8bit automatically.
(3) Communication test mode
・
Use the communication test mode to check the hardware of the RS485 communication train.
・
As for this function, communication mode selection (C079) is effective only at the time of ASCII mode (00).
(Procedure for communication test)
1) Remove all cables from the TM2 terminal block to perform a loopback test.
2) Make the following setting with the digital operator of the inverter:
- Specify "02" (loopback test) for the communication speed selection (C071).
3) Turn the inverter power off once, and then turn it back on, whereupon the communication test begins.
4) After the test is completed, the inverter displays one of the following:
- When the communication is normal:
- When the communication train is abnormal:
5) Press the STOP/RESET key of the digital operator or the reset button on the copy unit to switch to the normal
setting screen. Using the setting screen, change the setting made in step 2) to that desired.