98
EB 8384-6S EN
Operating the positioner
7.1 Determining the fail-safe position
Define the fail-safe position of the valve (0 %) taking the valve type and the actuator's direc
-
tion of action into account. Position the AIR TO OPEN/AIR TO CLOSE slide switch according
-
ly:
−
AIR TO OPEN
setting
Signal pressure opens the valve, e.g. for a fail-close valve
The AIR TO OPEN setting always applies to double-acting actuators.
−
AIR TO CLOSE
setting
Signal pressure closes the valve, e.g. for a fail-open valve
For checking purposes:
after successfully completing initialization, the positioner display
must read 0 % when the valve is closed and 100 % when the valve is open. If this is not the
case, change the slide switch position and re-initialize the positioner.
The switch position is prompted prior to an initialization. After an initialization has been
completed, changing the switch position does not have any effect on the operation of the po
-
sitioner.
7.2 Adjusting the volume restriction Q
The volume restriction Q serves to adapt the air
output capacity to the size of the actuator:
−
MAX BACK/MIN SIDE
setting for actuators
with a
transit time <1 s
, e.g. linear actua-
tors with an effective area smaller than
240 cm², require a restricted air flow rate.
−
MIN BACK/MAX SIDE
setting for actuators
with a
transit time ≥1 s
(the air flow rate
does not need to be restricted.)
Intermediate settings are not permitted.
MAX BACK
MIN SIDE
MIN BACK
MAX SIDE
Q
Fig. 37:
Volume restriction Q
MAX BACK/MIN SIDE setting
Malfunction due to changed start-up settings.
Initialize an initialized positioner again after the position of the volume restriction has been
changed.
Note
NOTICE
!
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