EF

FWD/REV Run Command Input Error

Yaskawa · GA500 Maintenance and Troubleshooting

What does EF mean?

This minor fault occurs when both a forward and a reverse run command are simultaneously active for more than 0.5 seconds, indicating a conflict in control signals. The motor will ramp to stop, preventing potential mechanical damage from conflicting commands.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Modify the control system to ensure that forward and reverse commands cannot be active simultaneously for an extended period (> 0.5s).

Source: Yaskawa GA500 Maintenance and Troubleshooting
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