AUMA SAR 07.2 - Safe ESD Reaction to Forced Limit Seating in End Position (Limit Evaluation) for Actu; Safe ESD Reaction for Forced Limit Seating in End Position (Limit Evaluation) for Actu

8.4.5. Safe ESD reaction to "Forced limit seating in end position" (limit evaluation) – for actuators with
electromechanical control unit: check
Configuration
This test is required for the following versions or configurations:
●
Actuator with electromechanical 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)
●
"SIL seating" configuration
= “Forced limit seating in end position”
(safety operation is stopped by limit switch tripping)
Test procedure
During the test, the reaction of the Safe ESD function to limit switch tripping during
safety operation is checked.
During Safe ESD operation, the actuator has to stop when reaching the position set
via limit switching.
The red test buttons [1] and [2] of the control unit are used for the test. These can
be used to operate the switches manually.
Figure 13: Electromechanical control unit
●
Turn test button [1] in direction of the LSC arrow: Limit switch CLOSED trips.
●
Turn test button [2] in direction of the LSO arrow: Limit switch OPEN trips.
Test procedure
1. Operate actuator in mid-position or at sufficient distance from the end positions.
2. Open the switch compartment
3. Initiate safety operation:
→
Set Safe ESDa and Safe ESDb input signals to 0 V (low).
Check seating via limit switches:
4. Operate limit switches until test is complete:
→
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 stopped.
5.
Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the
test.
6. Close switch compartment.
8.4.6. Safe ESD reaction for "Forced limit seating in end position" (limit evaluation) – for actuators
with electronic control unit and limit switches: check
Configuration
This test is required for the following versions or configurations:
●
Actuator with electronic control unit and limit switches
●
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)
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Multi-turn actuators
SA 07.2 – SA 16.2/SAR 07.2 – SAR 16.2 Tests and maintenance