Failure Modes; Failure Modes - Double Acting; Changes For Reverse Acting - Emerson E12 Produkthandbuch

5.0 Failure Modes / Ausfallarten / Storingen
Input
signal
1 A
2 B
Direct acting
5.0
Input
signal
1 A
2 B
Reverse acting
5.1
5.2
Rotary Linear
actuator actuator
B
A
Close
Rotary Linear
actuator actuator
B
A
Close
- Jumper setting
"Action"
- Jumper Einstellung
"Wirkungsweise
- Jumper instelling
"Werkwijze"
Action "Direct"
Wirkungsweise "Direkt"
Werkwijze "Direkt"
Action "Reverse"
Wirkungsweise "Umgekehrt"
Werkwijze "Omgekeert"
20
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:
1. Direct acting - Standard Setup
Action Air failure
2. Reverse acting
Action Air failure

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.
Signal failure
Signal failure
DOC,F20,EDN Rev.: -