3. Cancel release signals for directions CLOSE and OPEN one after the other:
3.1
First set Safe STOP CLOSE input signal to 0 V (low).
➥
Actuator must continue its operation
➥
No SIL fault signal may be issued.
3.2
Then set Safe STOP OPEN input signal to 0 V (low).
➥
The safety function is correct if the actuator stops.
➥
No SIL fault signal may be issued.
4.
Set Safe STOP CLOSE and Safe STOP OPEN to +24 V DC (high) again.
Information:If operation command OPEN from REMOTE issued via the control
room is still present, the actuator may start its operation!
5. Start operation command in direction CLOSE
6. Cancel release signals for directions OPEN and CLOSE one after the other:
6.1
First set Safe STOP OPEN input signal to 0 V (low).
➥
Actuator must continue its operation
➥
No SIL fault signal may be issued.
6.2
Then set Safe STOP CLOSE input signal to 0 V (low).
➥
The safety function is correct if the actuator stops.
➥
No SIL fault signal may be issued.
7.
Set Safe STOP CLOSE and Safe STOP OPEN to +24 V DC (high) again.
Information:If operation command OPEN from REMOTE issued via the control
room is still present, the actuator may start its operation!
8.4.10. Combination of Safe ESD and Safe STOP function: check
Configuration
This test is required for the following versions or configurations:
●
One of the following Safe ESD safety functions with any seating configuration:
- Safe ESD function: “Safe CLOSING" (Safe ESD in direction CLOSE)
- Safe ESD function: "Safe OPENING" (Safe ESD in direction OPEN)
●
Safe STOP function
If "SIL seating = no seating" (without end position protection) is configured,
faulty operation during the test may result in damage to the elements within
the safety-related system.
Possible consequences: Valve damage, motor overheating, contactor jamming, de-
fective thyristors, heating up or damage to cables.
→
Check "SIL seating" before proof test configuration.
→
For actuators with "SIL seating" = "No seating": Interrupt safety operation
before reaching the end position (Set Safe ESDa and Safe ESDb input
signals to +24 V DC).
→
For the test, the valve should either be in mid-position or at sufficient distance
from the end positions.
→
In case of damage, the actuator system has to be checked and repaired, if ne-
cessary.
Test procedure
This test is intended to confirm the correct function of the combination of Safe ESD
safety operation and the Safe STOP function.
Test procedure
1. Operate actuator in mid-position or at sufficient distance from the end positions.
33
Multi-turn actuators
SA 07.2 – SA 16.2/SAR 07.2 – SAR 16.2 Tests and maintenance
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