7.3.2 Characteristic values according to CEI EN 62061
•
“Hardware Feedback” Characteristic values according to CEI EN 62061
Value
Safety integrity levels
SIL 3
PFHd
9x 10
-10
ore-1
Test interval
20 years
•
“Software Feedback” Characteristic values according to CEI EN 62061
Value
Safety integrity levels
SIL 3
PFHd
9x 10
-10
ore-1
Test interval
20 years
7.4. Safety requirements
•
Complete stop The Safe Torque Off functions prevents the unexpected start-up of a motor when stopped. This
circuit may be used in the “safe stop” machine function. When the motor is rotating and the Safe Torque Off function
is enabled, an uncontrolled stop is generated (category 0 according to EN 60204- 1: 2006). When a category 1
controlled stop is requested, according to EN 60204-1: 2006, the motor must stop within defined deceleration
limits or after a delay in the application. The end machine must be able to stop the motor.
WARNING
During risk assessment, the engineer must evaluate the machine stop time. The Safe Torque Off safety function
operating time must be greater than the braking time of the deceleration ramp set with maximum speed and
maximum load on the axis. The assessment should allow for the possibility of a fault. The machine may have a
hazardous overload in the event of motor failure and additional protective measures may be required to attain safer
conditions.
AVERTISSEMENT
Au cours de l'évaluation des risques, l'ingénieur doit évaluer le temps d'arrêt de la machine. Le temps de
fonctionnement de la fonction de sécurité Safe Torque Off doit être supérieur au temps de freinage de la rampe de
décélération défini par vitesse maximale et charge maximale sur l'axe. L'évaluation devrait prévoir la possibilité d'un
défaut. La machine peut avoir une surcharge dangereuse en cas de panne de moteur et des mesures de protection
supplémentaires peuvent être nécessaires pour atteindre des conditions plus sûres.
• Response time
:
The maximum response time for STO safety function enabling and disabling is 10 ms.
• Environmental conditions (the following conditions have been validated for safety purposes. Other conditions are indicated in
Chapter 2 of this Manual)
• Ambient temperature: From 0 to +40 °C
• EMC immunity: according to EN 61800-3:2004, second (industrial) environment, category C3, (not suitable for use in a
prime environment which includes domestic environments)
• Resistance to vibrations: from 2 to 9 Hz, with an amplitude of 3 mm (peak); from 9 to 200 Hz, acceleration 1 g, according
to EN 60721-3-3:1995, Class 3 M4
• Resistance to impact: 10 g, semi-sinusoidal, 11 ms, according to EN 60721-3-3:1995, class 3 M4
• Casing. Electronic device to install in a casing with a minimum IP rating of 54.
• Pollution degree 2. The device must be installed in an environment with a pollution degree of 2, where only non-conductive
pollution is usually present. However, temporary conductivity caused by condensation, when the electronic device is not
operating, may occasionally be present.
DR2020
MAR2-E-191
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