Bürkert 8791, Руководство по эксплуатации

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22
Technical Data
Technical daTa 8.
safety positions after failure of the electrical or 8.1.
pneumatic auxiliary power
In single-acting actuators the safety position depends on the fluid connection of the actuator to the working con-
nections A1 or A2 (see
Fig. 6: and Fig. 7: )
actuator system designation
safety positions after failure of the auxiliary
power
electrical pneumatic
up
down
single-acting
Control function A
Normally closed
opened by spring force
Connection according to
Fig. 6:
down
down
Connection according to
Fig. 7:
up
up
down
single-acting
control function B
Normally open
closed by spring force
Connection according to
Fig. 6:
up
up
Connection according to
Fig. 7:
down
up
down
double-acting
Control function I
down / up
(depending on the con-
nection of the control
cables)
not defined
Safety Positions Table 2:
Sealing working
connection 2
Sealing working
connection 1
Connection A1 Fig. 6: Connection A2 Fig. 7:
english
Type 8791