Figure 12: Electromechanical control unit
●
Turn test button [1] in direction of the LSC arrow: Limit switch CLOSED trips.
●
Turn test button [1] in direction of the TSC arrow:Torque switch CLOSED trips.
●
Turn test button [2] in direction of the LSO arrow: Limit switch OPEN trips.
●
Turn test button [2] in direction of the TSO arrow: Torque switch OPEN trips.
Information If one of the test buttons (TSC/TSO) is turned without performing a safety operation,
a SIL fault signal is issued!
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. After limit switching evaluation:
5.1
Set Safe ESDa and Safe ESDb input signals to +24 V DC (high).
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.
Check seating via torque switches:
6. Initiate safety operation:
→
Set Safe ESDa and Safe ESDb input signals to 0 V (low).
7. Operate torque switches until test is complete:
→
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 stopped.
-
A SIL fault signal is issued via the SIL failure output.
- Display is illuminated in red.
8.
Set Safe ESDa and Safe ESDb input signals to +24 V DC (high) after the
test.
9. Acknowledge torque fault of standard controls.
10. Close switch compartment.
28
Multi-turn actuators
Tests and maintenance SA 07.2 – SA 16.2/SAR 07.2 – SAR 16.2
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