Delta ME300 Series - 15-8 Test and Fault Confirmation

Chapter 15 Safe Torque Off Function
ME300
15-11
15-8 Test and Fault Confirmation
After wiring the STO circuit in accordance with Section 15-3 Wiring Diagram, follow the steps below
to verify that the STO and related detection functions are working 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
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 ST1 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 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 ST2 error, and the response time of 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 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 6 below. However, if a situation that differs from these
four steps, or if STL3 occurs, then the Safe Torque Off function loop is not working normally. Please
refer to Section 15-7 Error Code and Troubleshooting Instructions.