Code

Name

Causes

Possible Solutions

SToF

Safe Torque OFF Hardware

One of the two terminals H1-HC and H2-HC received the Safe Disable input signal.

  • Make sure that the Safe Disable signal is input from an external source to terminals H1-HC or H2-HC.

  • When the Safe Disable function is not in use, use a jumper to connect terminals H1-HC and H2-HC.

The Safe Disable input signal is wired incorrectly.

There is internal damage to one Safe Disable channel.

Replace the board or the drive. For information about replacing the control board, contact Yaskawa or your nearest sales representative.
Note:

If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.