Burkert Type 8791 - Manual (Page 27)

27
Fluid connection
single-acting actuator - control function A or B
Connection:
working connection A1 to
actuator
A2 sealing
Connection:
working connection A2 to
actuator
A1 sealing
Fig. 17: Connection A1 Fig. 18: Connection A2
9.3.2. Double-acting actuators
actuator system
safety positions after failure of the
electrical aux-
iliary power
pneumatic
auxiliary power
up
down
lower-
chamber
upper
chamber
→
Connection
see “Fig. 19”
not defined
up = lower
chamber of the
actuator to A2
down = upper
chamber of the
actuator to A2
Control function I
Tab. 11: Safety positions - double-acting actuators
double-acting actuators - control function I
Connection:
Working connection A1 and A2
to actuator
Safety position:
up = lower chamber to A2
down = upper chamber to A2
Fig. 19: Connection with control function I
english
Type 8791