20
EB 8384-6S EN
Design and principle of operation
position.
In manual mode, the manual set
point is reset to 0 %. A different manual set
point must entered again.
Forced venting
If the voltage signal at ter81/–82
falls below 12 V, the i/p converter (6) is
de-energized. The positioner vents the actua-
tor and the control valve moves to the fail-
safe position determined by the actuator, re-
gardless of the set point.
Analog position transmitter
The position transmitter (13) is a two-wire
transmitter and issues the travel sensor signal
as a 4 to 20 mA signal processed by the mi
-
crocontroller. Since this signal is issued inde-
pendent of the positioner’s input signal, the
momentary travel/angle of rotation is con
-
trolled in real-time. Additionally, the position
transmitter allows positioner faults to be indi-
cated over a signal current of <2.4 mA or
>21.6 mA.
Leakage sensor
By upgrading the positioner with a leakage
sensor, it is possible to detect seat leakage
when the valve is in the closed position. De-
tails on EXPERTplus Valve Diagnostics in the
Operating Instructions
u
Binary input
The optional binary input can be configured:
−
To connect a floating contact
−
To connect a non-floating contact (0 to
24 V DC)
By selecting a certain function, one of the
following actions can be activated:
−
Transmit switching state
The switching state of the binary input is
logged.
−
Activate local write protection
After the first initialization, a local write
protection can be activated.
While the binary input is active, no set
-
tings can be changed at the positioner.
The positioner cannot be re-initialized.
Enabling configuration over Code 3 is
not active ( ).
−
Switch AUTO/MAN
The positioner changes from the auto-
matic mode (AUTO) to the manual
mode (MAN) or vice versa.
This function is not performed if the posi-
tioner is in the fail-safe position mode
(SAFE).
−
Various diagnostic functions
u
Additionally, the external solenoid valve
function can be selected if a non-floating
contact is configured:
−
External solenoid valve
The voltage for an external solenoid
valve is connected in parallel to terminals
+31/–32. This allows the switching state
of the solenoid valve to be monitored.
The optional binary input can only be con
-
figured using the operator software e.g.
TROVIS-VIEW. The switching state is trans-
mitted when the switch is closed by default.
Note
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