AUMA SAR 07.2 Manual

3. Architecture, configuration and applications
3.1. Architecture (actuator sizing)
For actuator architecture (actuator sizing) the maximum torques, running torques
and operating times are taken into consideration.
Incorrect actuator architecture can lead to device damage within the safety-
related system!
Possible consequences can be valve damage, motor overheating, contactor jamming,
defective thyristors, heating up or damage to cables.
→
The actuator technical data must imperatively be observed when selecting the
actuator.
→
Sufficient reserves have to be provided to ensure that actuators are capable of
reliably opening or closing the valve even in the event of an accident or under-
voltage.
Architecture when using the Safe STOP function
Information For the Safe STOP function, the motor is switched off, overrun may possibly occur!
Valve damage due to overrun!
→
For the Safe Stop function (SS), the overrun of the arrangement (actuator,
gearbox, valve) and the reaction time have to be observed.
→
If the application requires self-locking of the actuator, please consult AUMA.
Architecture when using the Safe ESD function
Actuators with electromechanical control unit:
End position signalling (limit switching) and torque signalling via the electromechanical
control unit are safe signals which may be integrated into a safety-related system.
For "SIL seating" = "no seating" (without end position protection), we recommend:
●
To prevent valve damage during safety operation, we recommend, depending
on the stiffness, sizing the valve to 3 – 5 times the maximum actuator torque.
●
To avoid thermal damage due to excessive currents, we recommend monitoring
(assessing) the motor protection.
Actuator with electronic control unit MWG:
Information End position signalling (limit switching) and torque signalling via the electronic control
unit MWG are not considered as safe signals.
●
In case safe signals are required, they have to be implemented differently, e.g.
using switches on the valve.
●
To prevent valve damage during safety operation, we recommend, depending
on the stiffness, sizing the valve to 3 – 5 times the maximum actuator torque.
●
To avoid thermal damage due to excessive currents, we recommend monitoring
(assessing) the motor protection.
Actuators with electronic control unit MWG including limit switches:
Information In this version, safe signalling can exclusively be ensured via limit switches.
For "SIL seating" = "no seating" (without end position protection), we recommend:
●
To prevent valve damage during safety operation, we recommend, depending
on the stiffness, sizing the valve to 3 – 5 times the maximum actuator torque.
●
To avoid thermal damage due to excessive currents, we recommend monitoring
(assessing) the motor protection.
7
Multi-turn actuators
SA 07.2 – SA 16.2/SAR 07.2 – SAR 16.2 Architecture, configuration and applications

AUMA SAR 07.2 Specifications

General

Brand	AUMA
Model	SAR 07.2
Category	Controller
Language	English