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8.4.2 SIL fault signal “Actuator monitoring”: check
This test is required for the following versions or configurations:
• Safe ESD function “Safe CLOSING” (Safe ESD in direction CLOSE)
• Safe ESD function “Safe OPENING” (Safe ESD in direction OPEN)
If the motor does rotate within a defined time once safety operation was triggered, a SIL fault
must be signaled.
8.4.3 Safe ESD reaction for “Motor protection (thermal fault)” signals: check
This test is required for the following versions or configurations:
• Safe ESD function “Safe CLOSING” (Safe ESD in direction CLOSE)
• Safe ESD function “Safe OPENING” (Safe ESD in direction OPEN)
In order to protect against overheating and impermissibly high surface temperatures at the
actuator, PTC thermistors or thermoswitches are embedded in the motor winding. Motor
protection trips as soon as the max. permissible winding temperature has been reached.
For a safety operation via Safe ESD function, the actuator reaction for motor protection
tripping depends on the “SIL motor protection” configuration:
• For “SIL motor protection” = active configuration
= safety operation is stopped.
• For “SIL motor protection” = inactive configuration
= safety operation is not stopped.
- For “Safe CLOSING” (Safe ESD in direction CLOSE) configuration: Start
operation command in direction OPEN.
- For ““Safe OPENING” (Safe ESD in direction OPEN) configuration: Start
operation command in direction CLOSE.
Information: For the test, operation commands (in directions OPEN or CLOSE) can be
executed both from remote (via DCS) and from Local at the controls (via the push
buttons of the local controls).
2. Start safety operation during operation:
- Set Safe ESDa and Safe ESDb input signals to 0 V (low).
® Safety function is correct if the actuator stops and performs a safety operation into the
configured direction.
® No SIL fault signal may be issued.
3. Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the test.
1. Operate actuator in mid-position or at sufficient distance from the end positions.
2. Lock handwheel with the “Handwheel lockable” option padlock, so that the manual drive
remains engaged.
3. Start Safe ESD safety operation:
- Set Safe ESDa and Safe ESDb input signals to 0 V (low).
® The SIL fault signal is correct, if a SIL fault signal is sent within four seconds via the
SIL failure output.
4. Once the test is complete set Safe ESDa and Safe ESDb input signals to +24 V DC
(high) and disable motor lock.
Multi-turn actuators
SA series with Control 3.XX /NI/SIL
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