Rs422/rs485 self-test, Rs422/rs485 self-test -7 – Yaskawa F7 Modbus User Manual
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Troubleshooting Serial COM 3-7
RS422/RS485 Self-Test
The F7 drive can perform a self-test of the communications interface. To perform the self-test:
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Apply power to the F7 drive.
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Set parameter H1-01 to 67h (self-test).
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Remove power from the F7 drive and wait for the charge lamp to be completely extinguished. Wait at least five additional minutes for
the F7 drive to be completely discharged. Measure the DC bus voltage and verify that it is at a safe level.
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Connect jumper wires to the F7 drive terminals as shown below.
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Reapply power to the F7 drive.
The frequency reference is displayed on the digital operator if the communications interface is functioning normally.
If “CE” is displayed on the digital operator, the F7 drive fault signal is ON and the F7 drive ready signal is OFF, the communications interface is
not functioning.
Figure 3.2 – RS422/RS485 Self-Test