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.
Information
For “SIL seating” = “Forced limit seating in end position”, the seating is performed
via limit switches in the end position. Since each switch has a hysteresis, the actuator
leaves the end position prior to limit switch release. Consequently, there is a marginal
range of actuator positions to the safety position, for which the limit switch is still
operated when leaving the safety position while the Safe ESD function is NOT
available. In this case, safety function triggering leads to actuator standstill. If the
range in question is approached from the opposite direction, this limitation does not
apply. In general this range is relatively small. However, for unfavourable configura-
tions, this range can amount to more than 10 % of the travel.
Should within the framework of unfavourable conditions the effect described above
represent an unacceptable limitation for the safety function, we recommend applying
the configuration “Forced torque seating in end position” or “no seating” for safety
operation.
Power supply
Information
The plant operator is responsible for power supply.
3.2.
Configuration (setting)/version
Configuration (setting) of safety-related functions is defined in the factory during
actuator controls assembly and validated during final inspection. Subsequent
modification of the configuration by the plant operator is not permissible.
General functions are set as described in the Operation instructions or the Manual
(Operation and setting) AUMATIC AC 01.2.
Configuration of safety-related functions is listed in the order-related technical data
sheet.
Configuration options for safety function
Table 3:
Configuration options for safety function
Short description
Configuration
SIL function
Safe CLOSING
Safe ESD CLOSE/CLOSE
Safe OPENING
Safe ESD OPEN/OPEN
Safe STOP in direction CLOSE and direction OPEN
Safe STOP CLOSE/OPEN
Safe CLOSING and Safe STOP in direction CLOSE and direc-
tion OPEN
Safe ESD CLOSE/CLOSE + Safe STOP
CLOSE/OPEN
Safe OPENING and Safe STOP in direction CLOSE and direc-
tion OPEN
Safe ESD OPEN/OPEN + Safe STOP
CLOSE/OPEN
When configuring a Safe ESD function and a Safe STOP function, the Safe ESD
function is always prioritised compared to the Safe STOP function when requested
simultaneously.
Seating configuration options
Information
Seating of standard actuator controls should be configured as set forth in the tables
below.
9
Part-turn actuators
with AC 01.2-SIL/ACExC 01.2-SIL
Architecture, configuration and applications
