31
During Safe ESD operation, the actuator has to stop when reaching the position set via limit
switching.
8.4.7 Safe ESD reaction to “Forced torque seating in end position” (torque after limit evaluation): check
This test is required for the following versions or configurations:
• Actuator with control unit
• One of the following safety functions:
- Safe ESD function “Safe CLOSING” (Safe ESD in direction CLOSE)
- Safe ESD function “Safe OPENING” (Safe ESD in direction OPEN)
• Configuration of “SIL seating”
= “Forced torque seating in end position”
(Safety operation is stopped by tripping the torque switches (overload protection).
Provided that the respective limit switch tripped before).
During the test, the reaction of the Safe ESD function to torque switch tripping (after limit
switch tripping) during safety operation is checked.
The red test buttons and of the control unit are used for the test. These can be used to operate
the switches manually.
• Turn test button in direction of the TSC arrow: Torque switch CLOSE trips.
• Turn test button in direction of the TSO arrow: Torque switch OPEN trips.
1.
Operate actuator in mid-position or at sufficient distance from the end positions.
2. Initiate safety operation:
® Set Safe ESDa and Safe ESDb input signals to 0 V (low).
Check seating via limit switches:
3. Wait until actuator has reached the limit end position and has activated
the pertaining limit switch.
ü
The safety function reaction to the limit switch signals is correct if safety
operation is stopped.
4. Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the 2.
Fasten control cover screws and tighten glands at conduit entries.
20. Mechanical position indicator: The two dials have a slip clutch for easy adjustment.
At valve fully closed, turn dial (CLOSED) till the arrow is in alignment with the
mark on the show glass. Operate valve into fully OPEN position and adjust dial
marked (OPEN) till the arrow mark is in alignment with the mark on the cover.
The dial (CLOSED) must be held in position while adjusting dial (OPEN). (fig.19).
1. Use standard controls to operate actuator into the end position of the configured Safe
ESD function (until limit switch in end position trips).
2. Open the switch compartment.
3. Operate torque switches and hold activated.
- For Safe CLOSING (Safe ESD in direction CLOSE) configuration: Turn test button
in direction of the TSC arrow:
- For "“Safe OPENING” (Safe ESD in direction OPEN) configuration: Turn test
button in direction of the TSO arrow:
4. Start safety operation while torque switch is operated:
- Set Safe ESDa and Safe ESDb input signals to 0 V (low).
® The safety function reaction to the torque switch and limit switch signals is correct if:
- Safety operation is not started.
- No SIL fault signal is issued via the SIL failure output.
5. Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the test.
6. Close switch compartment.
Multi-turn actuators
SA series with Control 3.XX /NI/SIL
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