27
Pneumatic connection
Single-acting actuators -
control function A or B
Connect working port A1
to the actuator
Seal A2
A1
A2
P
Connect working port A2
to the actuator
Seal A1
A1
A2
P
Fig. 18: Connection A1
Fig. 19: Connection A2
9.3.2 Double-acting actuators
Actuator type
Safety end positions after failure
of the
electrical auxi
-
liary power
pneumatic
auxiliary power
up
down
Lower
chamber
Upper
chamber
→
Connection
not defined
up = lower
chamber of the
actuator on A2
down = upper
chamber of the
actuator on A2
Control function I
Tab. 11: Safety end position, double-acting actuators
Double-acting actuators -
control function I
A1
A2
P
Connect working ports A1 and A2 to
the actuator
Safety end position:
up = lower chamber on A2
down = upper chamber on A2
Fig. 20: Connection at control function I (SFI)
Type 8791 REV.2
english
Summary of Contents for 323219
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