Vacon optbj Safety Manual page 23

STO and SS1 safety functions
Figure 10 shows the connection principle of Safe Stop 1 safety function, as specified in figure 8.
• 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 family AC 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 8 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. See Chapter 6.2 for the wiring and
parametrization of Safe Stop 1.
Switch
Figure 10. The connection principle of Safe Stop 1 (SS1)
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
13006.emf
ommended 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.
13006.emf
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
Safety Relay
with timer
Ramp stop
STO1
Time
delay
STO2
®
100 default application software it is rec-
Basic I/O
Digital input
Vacon 100
control
OPTBJ board
STO channel 1
STO channel 2
Power Unit
M
11577A_uk
vacon • 23
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