●
Configuration of “SIL seating”
= “no seating”
(Safe OPENING or CLOSING without responding to any protective equipment)
Test procedure
For Safe ESD operation, the actuator has to perform the safety operation without
interruption. Limit switching and/or torque switching must not stop the safety operation
Since "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.
→
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 sequence
Information: For version with electronic control unit with limit switches, steps
6 – 9 are obsolete.
1.
Operate actuator in mid-position or at sufficient distance from end positions.
2.
Open the switch compartment
3.
Initiate safety operation:
→
Set
Safe ESDa
and
Safe ESDb
input signals to 0 V (low).
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).
36
Part-turn actuators
Tests and maintenance
with AC 01.2-SIL/ACExC 01.2-SIL
