AUMA SA3 - Protection against Uncontrolled Operation (Self-Locking;Brake)

10
Seating configuration options
Information
Seating of standard actuator controls should be configured as set forth in the tables below.
Table 4:
Table 5:
Table 6:
Configuration options for motor protection assessment
Table 7:
Information
“SIL motor protection” = “inactive” configuration is only set if explicitly required. The version
does not meet the Ex approval requirements.
3.3 Protection against uncontrolled operation (self-locking/brake)
For self-locking AUMA actuators, it can be assumed that a load up to nominal torque will not
result in uncontrolled valve operation from standstill due to valve torque load. Consequently,
in these cases, further protection against uncontrolled operation is not imperatively required.
However, certain applications may require active position locking, for example by using a
brake. There are user-specific standards demanding this type of protection. Therefore, each
project must be subject to individual verification if any further protection is required. In any
case this protection is required for actuators without self-locking.
For actuators with electromechanical control unit:
Configuration
SIL seating type
Short description
Configuration
Type of seating
Standard controls
1: No seating
No seating by limit or torque switches during
safety operation
Freely selectable
2: Forced torque seating
in end position
Safety operation is stopped if both limit and
torque switches trip simultaneously
Torque seating
3: Forced limit seating in
end position
Safety operation is stopped by limit switch trip-
ping
Limit seating
4: Limit seating with
overload protection
Safety operation is stopped by tripping the limit
switches and/or the torque switches (overload
protection).
Limit seating
For actuators with electronic control unit MWG
Configuration
SIL seating type
Short description
Configuration
Type of seating
Standard controls
1: No seating
No seating by limit or torque switches during
safety operation
Freely selectable
For actuators with electronic control unit MWG including limit switches
Configuration
SIL seating type
Short description
Configuration
Type of seating
Standard controls
3: Forced limit seating in
end position
Safety operation is stopped by limit switch trip-
ping
Limit seating
Configuration options for motor protection assessment
Configuration
SIL motor protection
Short description
Active
Tripping of the motor protection (thermal fault) stops or prevents safety oper-
ation
Inactive
Motor protection has no impact on the safety operation
Multi-turn actuators
SA series with Control 3.XX /NI/SIL