30
Technical data
Type 8792, 8793 REV.2
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.
Type of actuator
Designation
Safety end positions after failure of the
auxiliary power
pneumatic aux-
iliary 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 according to “Figure 11”
not defined
up = lower chamber of the actuator to A2
down = upper chamber of the actuator to
A2
Table 8:
Safety end positions
pneumatic
connection:
Description of “Table 8”.
Single-acting actuators
Control function A or B
Double-acting actuators
Control function I
Connect working con-
nection A1 to actuator
Close A2
Connect working con-
nection A2 to actuator
Close A1
Connect working connection A1
and A2 to actuator
Safety end position:
up = lower chamber to A2
down = upper chamber to A2
Table 9:
Pneumatic connection
english
Summary of Contents for 8792
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