Communication Test Mode - Hitachi SJ300 Series Instruction Manual

Communication
The communication test mode verifies that the inverter can properly send and receive data via
the RS485 serial port. Follow the steps below to perform the communication test.
Test Mode
1. Remove the serial cable (if present) connected to the TM2 connector block of the control
NOTE: It is not necessary to connect a loopback jumper. The RS485 port uses a transceiver for
communications, which already allows simultaneous transmitting and receiving.
2. Use the front panel keypad to navigate to parameter C071, Communication Speed
3. Turn the inverter power OFF and then ON again. Observe the keypad display and compare
4. Press the Stop/Rest button on the keypad to return the inverter keypad/ display to normal
5. Change C071 to its original setting (default is C071=04). Otherwise, while C071=02, the
terminals, as shown below.
TM2
SP SN RP SN
Serial
communications
Selection. Change parameter C071=02 and press Store. Value 02 is the Test option. Now the
inverter is ready to conduct the loopback test.
to the results shown below.
PASS
operation.
inverter will perform the communications loopback test at each powerup.
B–19
SJ300 Inverter
FAIL