STO and SS1 safety functions vacon • 19
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Figure 8 shows the connection principle of Safe Stop 1 safety function, as specified in figure 6.
• The time delayed safety relay outputs are connected to the STO inputs.
• A separate digital output from the safety relay is connected to a general digital input of the
Vacon 100 drive. The general digital input must be programmed to execute the drive stop
command and initiates the drive stop function without a time delay (must be set to "stop by
ramp") and causes motor deceleration. If the SS1 behavior of Figure 6 is required then it
must be ensured that the ramp stop is activated when the stop signal is received. It is the
responsibility of the system designer to verify this.
Figure 8. The connection principle of Safe Stop 1 (SS1)
See Chapter 5.4 concerning the parametrizing of Safe Stop 1 and Chapter 5.3.5 for the wiring of Safe
Stop 1.
CAUTION! The system designer/user is responsible for understanding and setting
the time delay of the safety relay, as it is process/machine dependent.
• The time delay must be set to a greater value than the deceleration time of
the drive*. The motor deceleration time is process/machine dependent.
• The stop function of the drive needs to be correctly set for the process/
machine. Activating the SS1 safety function must execute the configured
stop in the drive. In the Vacon 100 default application software it is recom-
mended to use the "Quick Stop" functionality for this purpose.
* In case of a single fault the drive may not ramp down but is only put to STO mode after the config-
ured time delay.
CAUTION! The control place must be set according to the application require-
ments.
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