Operating Instructions

Safe Torque Off Function
Timing Diagram Description
383 | 443
Figure 17-6
STO, Pr.06-44=1
As shown in the figure below, when both of S1–DCM and S2–DCM are OFF during operation (STO function is
required), the drive stops outputting. When the S1 / S2 status is restored (ON), the STO alarm clears automatically.
The drive outputs when the RUN command is executed again.
Figure 17-7
STL1, Pr.06-44=0 or 1
As shown in the figure below, when S1–DCM is OFF during operation (STO function is required) and S2–DCM is
ON (STO function is not required), the drive stops outputting and the keypad shows the STL1 error. However, you
cannot reset the STL1 error even if the S1 status is restored (ON) regardless of the parameter setting. You must
cycle the power to reset and to restore the drive to the normal standby state.