Chapter 17 Safe Torque Off FunctionMS300
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17-8 Test and Fault Confirmation
After wiring the STO circuit in accordance with Section 17-3 Wiring Diagram, follow the steps below to
verify that the STO and related detection functions work normally.
1. When the drive is powered on, make sure that the S1–DCM and S2–DCM voltage falls between 11–
30 V
DC
. At this time, the drive should enter Standby mode and wait for RUN command. There is no
error displayed on the keypad.
2. Press RUN on the keypad and use the emergency button or other method to make the S1–DCM
and S2–DCM voltage fall between 0–5 V
DC
. At the same time, after the output frequency is reached,
the drive should enter Torque Stop mode STO and stop outputting voltage. The keypad displays the
STO error, and the response time of the S1 and S2 signals to cause the drive to stop outputting
voltage should be ≤ 20 ms. Then restore the S1–DCM and S2–DCM voltage to 11–30 V
DC
, and
press RESET button on the keypad to clear the STO error. The drive should enter Standby mode
and wait for RUN command.
3. Press RUN on the keypad and use the emergency button or other method to make the S1–DCM
voltage fall between 0–5 V
DC
, and the S2–DCM voltage remain between 11–30 V
DC
after the output
frequency is reached. At this time, the drive should enter Torque Stop mode STL1 and stop
outputting voltage. The keypad displays the STL1 error, and the response time of S1 signals to
cause the drive to stop outputting voltage should be ≤ 20 ms. Then restore the S1–DCM voltage to
11–30 V
DC
. However, pressing RESET button on the keypad cannot clear the STL1 error. You must
cycle the power to the drive. Make sure that the S1–DCM and S2–DCM voltage falls between 11–
30 V
DC
and then cycle the power to the drive, then the STL1 error is cleared. The drive should enter
Standby mode and wait for RUN command.
4. Press RUN on the keypad and use the emergency button or other method to make the S2–DCM
voltage fall between 0–5 V
DC
, and the S1–DCM voltage remain between 11–30 V
DC
after the output
frequency is reached. At this time, the drive should enter Torque Stop mode STL2 and stop
outputting voltage. The keypad displays the STL2 error, and the response time of the S2 signals to
cause the drive to stop outputting voltage should be ≤ 20 ms. Then restore the S2–DCM voltage to
11–30 V
DC
. However, pressing RESET button on the keypad cannot clear the STL2 error. You must
cycle the power to the drive. Make sure that the S1–DCM and S2–DCM voltage falls between 11–
30 V
DC
and then cycle the power to the drive, then the STL2 error is cleared. The drive should enter
Standby mode and wait for RUN command.
5. If you can conduct these four steps normally in sequence with no other error, then the Safe Torque
Off function loop is normal, as shown in Table 17-6 below. However, if a situation that differs from
these four steps, or if STL3 occurs, then the Safe Torque Off function loop does not work normally.
Refer to Section 17-7 Error Code and Troubleshooting Instructions for details.
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