
KH 8384-5 EN
11
Design and principle of operation
2.2
Additional equipment
Solenoid valve
If the operating voltage for the solenoid valve (12) fails, the supply pressure for the i/p con
-
verter is vented to the atmosphere. The positioner can no longer operate and the control
valve moves to the fail-safe position determined by the actuator, regardless of the set point.
The manual set point is also reset to 0 % after the solenoid valve is activated!
A different manual set point must be entered again (Code 1).
Inductive limit contact
In this version, the rotary shaft of the positioner carries an adjustable tag which actuates the
built-in proximity switch.
External position sensor
In this version, only the sensor is mounted to the control valve. The positioner is located sepa-
rately from the valve. The connection of x and y signals to the valve is established by cable
and piping for air (only without inductive limit contact).
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.
Binary inputs
Binary input BI1 (14)
As a standard feature, the positioner comes with a binary input used to signalize process in-
formation over the
F
OUNDATION
™
fieldbus network.
Binary input BI2 (15)
This binary input BI2 is optional. It is an active input which is powered by the positioner to
connect a floating contact. The switching state of the floating contact can be indicated over
the
F
OUNDATION
™
fieldbus network.
The binary inputs are configured in the DI Function Blocks.
NOTICE
!
Note
Содержание FOUNDATION 3730-5
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