Yaskawa G7 Modbus Communication - Manual (Page 40)

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RS-422/RS-485 Self-Test
The G7 drive can perform a self-test of the communications interface. To perform the self-test:

Apply power to the G7 drive.

Set parameter H1-05 to 67 (communication self-test). Terminal S7 is just an example. Any terminal can be used.

Remove power from the G7 drive and wait for the charge lamp to be completely extinguished. Wait at least five additional minutes for
the G7 drive to be completely discharged. Measure the DC bus voltage and verify that it is at a safe level.

Connect jumper wires to the following G7 drive control terminals (see picture below):
- Connect S+ to R+
- Connect S- to R-
- Connect S7 to SC

Reapply power to the G7 drive.
Successful Self-Test
- The frequency reference is displayed on the digital operator if the communications interface is functioning normally.
Unsuccessful Self-Test
- If “CE” is displayed on the keypad, the communications interface is not functioning properly. Contact the factory for assistance.
Figure 3.1 RS-422/RS-485 Self-Test Example using Terminal S7