Delta VFD11AMS21AFSHA, User Manual

Page: 444 / 445

Chapter 17 Safe Torque Off Function

MS300
(High Speed Model)
17-11
17-8 Test and Fault Confirmation
After wiring in accordance with Section 17-3 Wiring Diagram, please follow the steps below to check
whether STO and related detection function are normal.
1. When the drive is powered on, make sure that S1~DCM and S2~DCM voltage falls between 11
VDC~30 VDC, at this time, the drive should enter standby mode and waits for RUN command.
There is no error displayed on keypad.
2. Press RUN command on the drive, use the emergency button or other methods to make S1~DCM
and S2~DCM voltage falls between 0 VDC~5 VDC simultaneously after the output frequency is
reached, at this time, the drive should enter torque stop mode STO and stop outputting voltage.
Keypad displays STO error, and the response time of S1 and S2 signals to the drive stops
outputting voltage should be
≤ 20 ms. Then restore S1~DCM and S2~DCM voltage to 11 VDC~30
VDC, press RESET button on keypad and STO error will be cleared. The drive should enter
standby mode and waits for RUN command.
3. Press RUN command on the drive, use the emergency button or other methods to make S1~DCM
voltage fall between 0 VDC~5 VDC, and S2~DCM voltage maintain between 11 VDC~30 VDC
after the output frequency is reached, at this time, the drive should enter torque stop mode STL1
and stop outputting voltage. Keypad displays ST1 error, and the response time of S1 signals to the
drive stops outputting voltage should be
≤ 20 ms. Then restore S1~DCM voltage to 11 VDC~30
VDC, however press RESET button on keypad cannot clear STL1 error, the drive needs to be
re-powered. Make sure that S1~DCM and S2~DCM voltage falls between 11 VDC~30 VDC and
then re-power the drive, thus STL1 error will be cleared. The drive should enter standby mode and
waits for RUN command.
4. Press RUN command on the drive, please use the emergency button or other methods to make
S2~DCM voltage fall between 0 VDC~5 VDC, and S1~DCM voltage maintain between 11
VDC~30 VDC after the output frequency is reached, at this time, the drive should enter torque stop
mode STL2 and stop outputting voltage. Keypad displays ST2 error, and the response time of S2
signals to the drive stops outputting voltage should be
≤ 20 ms. Then restore S2~DCM voltage to
11 VDC~30 VDC, however press RESET button on keypad cannot clear STL1 error, the drive
needs to be re-powered. Make sure S1~DCM and S2~DCM voltage falls between 11 VDC~30
VDC and then re-power the drive, thus STL2 error will be cleared. The drive should enter standby
mode and waits for RUN command.
5. If the above four steps can be conducted normally in sequence with no other error, then the safe
torque off function loop is normal, as shown in Table 5 below. However, if there are situations differ
from the above four steps or if STL3 occurs, the safe torque off function loop is abnormal. Please
refer to 17-7 Error Code and Troubleshooting Instructions.