Function Applications
-535-
Step Test
Result
6
When the motor is running, test the STO 1 channel signal:
Set STO1 and STO2 to H.
Start the AC drive and check that the motor runs normally.
Enable the STO function by disconnecting (low state or open circuit) the STO
1 channel input signal.
Make sure the motor stops, reset the fault and try to start the AC drive.
Make sure the motor stays still and the AC drive display shows "E47.02".
The STO1 channel signal is restored and the fault is cleared. Use the ON/RUN
command of the AC drive, and check that the motor works normally.
When the motor is running, test the STO 2 channel signal:
Set STO1 and STO2 to H.
Start the AC drive and check that the motor runs normally.
Enable the STO function by disconnecting (low state or open circuit) the STO
2 channel input signal.
Make sure the motor stops and the drive trips.
Reset the fault and try to start the AC drive.
Make sure the motor stays still and the AC drive display shows "E47.02".
The STO2 channel signal is restored and the fault is cleared. Use the ON/RUN
command of the AC drive, and check that the motor works normally.
7
Record and sign the acceptance test report to prove that the safety function
is safe and the equipment can be put into operation.
Special Requirements
To achieve SIL 3 performance level E (Cat3), the AC drive must be powered off every 3 months and
powered on again for startup diagnosis.
4.7.6 Safety Function and Monitoring
Description of Safety Function
Safety torque off (STO) is a safety function that complies with IEC 61800-5-2:2016. This product is
integrated with the STO function. The STO function disables the power semiconductor control signal at
the drive output end to prevent the AC drive from generating torque at the motor shaft end. The STO
function blocks the output of PWM signals to the power layer of the AC drive through external
redundant hardware terminals STO1 and STO2, thus preventing the movement of the motor. These
two + 24VDC signals must be active to enable normal operation of the AC drive. If either or both of
them are at low level simultaneously, the PWM signal will be blocked in the next 20 ms.
Figure 4-71 Safety function
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