Limit switching evaluation
4. Operate limit switches:
→
For "Safe CLOSING" (Safe ESD in direction CLOSE) configuration:
Turn test button [1] in direction of the LSC arrow.
→
For "Safe OPENING" (Safe ESD in direction OPEN) configuration:Turn
test button [2] in direction of the LSO arrow.
➥
The safety function reaction to the limit switch signals is correct if safety opera-
tion is not stopped.
5. After limit evaluation:
5.1
Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) be-
fore reaching the end position.
5.2 Operate actuator via local controls or from REMOTE to end position OPEN
and then to end position CLOSED. (Positions will be recorded anew).
5.3 Operate actuator to mid-position or at sufficient distance from the end
positions.
Torque switching evaluation
6. Initiate safety operation:
→
Set Safe ESDa and Safe ESDb input signals to 0 V (low).
7. Operate torque switches:
→
For "Safe CLOSING" (Safe ESD in direction CLOSE) configuration:
Turn test button [1] in direction of the TSC arrow:
→
For "Safe OPENING" (Safe ESD in direction OPEN) configuration:Turn
test button [2] in direction of the TSO arrow:
➥
The safety function reaction to the torque switch signals is correct if:
- Safety operation is not stopped.
-
A SIL fault signal is issued via the SIL failure output.
- Display is illuminated in red.
8.
Once the test is complete, set Safe ESDa and Safe ESDb input signals to
+24 V DC (high) before reaching the end position.
9. Acknowledge torque fault of standard controls.
10. Close switch compartment.
8.4.9. Safe STOP function: check
Configuration
The test applies to the “SIL function” = ”Safe STOP CLOSE/OPEN” (safe stop).
The seating configuration is not relevant to the test as it has no impact on the safe
stop function.
Test procedure
If the Safe STOP CLOSE or Safe STOP OPEN signals are switched accordingly,
the actuator must stop.
Test procedure
1. Operate actuator in mid-position or at sufficient distance from the end positions.
2. Start operation command in direction OPEN.
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).
32
Multi-turn actuators
Tests and maintenance SA 07.2 – SA 16.2/SAR 07.2 – SAR 16.2
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