20
DOC,F20,EFS Rev.: -
Input
signal
Rotary
actuator
Linear
actuator
1
2
A
B
Close
B
A
Direct acting
Input
signal
Rotary
actuator
Linear
actuator
1
2
A
B
Close
B
A
Reverse acting
5.1
Failure Modes - Double acting
The standard setup for double acting actuators is so that an
increasing input signal opens the valve. Signal failure, then,
moves the valve to the closed position . This may be changed
to “Open on signal failure” by changing the setup to REVERSE
ACTING.
The effect of signal and air failure depends on the way the air
connections and the potentiometer connections are made:
5.0
Failure Modes / Modes de panne / Modos de fallo
5.0
5.1
5.2
Potentiometer jumper setting =
Le positionnement du cavalier de potentiomètre =
El ajuste del puente del potenciómetro.
Action
Air failure
Signal failure
Direct
Position not defined
Closed
Action
Air failure
Signal failure
Reverse
Position not defined
Open
1. Direct acting - Standard Setup
2. Reverse acting
Action "Direct"
Action "Directe"
Acción "Directo"
Action "Reverse"
Action "Inversée"
Acción "Inverso"
- Jumper setting
"Action"
- Jumper Einstellung
"Wirkungsweise
- Jumper instelling
"Werkwijze"
5.1.1 Changes for Reverse Acting
To change from the standard setup to reverse acting:
1. Change the tubing (see fig. 5.1).
2. Remove the cover.
3. Change the action jumper setting by setting both jumpers to
the right side (see fig. 5.2).
4. Replace the cover taking care that the “O” ring seal is in
place and the fixing screws are tightened correctly.
Содержание POSIFLEX F20
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