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Description of System
10.9. Safety end positions after failure of the electrical
or pneumatic auxiliary power
The safety end position depends on the pneumatic connection of the actuator to the working connections A1 or
A2.
Actuator system Designation
Safety end positions after failure of the
electrical auxiliary power
pneumatic
auxiliary power
up
down
single-acting
Control function
A
down
→ Connection according to “Figure 9”
down
up
→ Connection according to “Figure 10”
up
down
single-acting
control function
B
up
→ Connection according to
“Figure 9”
up
down
→ Connection according to “Figure 10”
up
down
lower
chamber
upper
chamber
double-acting
Control function
I
connection see “Figure 11”
not defined
up = lower chamber of the actuator to A2
down = upper chamber of the actuator to A2
Table 8: Safety end position
Pneumatic connection: Description for “Table 8”
Single-acting actuators
Control function A and B
Double-acting actuators
Control function I
Connection:
working connection A1 to actuator
A2 sealing
Connection:
working connection A2 to actuator
A1 sealing
Connection:
Working connection A1 and A2
to actuator
Safety end position:
up = lower chamber to A2
down = upper chamber to A2
Figure 9: Connection A1 Figure 10: Connection A2 Figure 11: Connection with CFI
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