16
7 VG9H 70 en
4
LOCAL USER INTERFACE (LUI)
The local user interface may be used to monitor the device
behaviour as well as configuring and commissioning the
controller during installation and normal operation. The
local user interface consists of two row LCD and four button
keypad interface. There are also custom graphical charac-
ters for special conditions.
4.1
Measurement monitoring
When the device is powered, it enters the measurement
monitoring view. The following measurements may be
viewed from the display. The Table 4 identifies the default
unit and also optional unit of the measurement.
If the unit selection is altered via HART to US units, the pres-
sure default unit will automatically be changed to psi and
temperature unit to Fahrenheit.
The active unit may be changed by pressing the
?
key
constantly. The display shows the current unit selection on
the top row of the display. You may change the selection by
pressing
+
or
-
while keeping the
?
key pressed down.
When the buttons are released the current selection will be
activated.
If the device has been idle for 1 hour, and there is no user
activity on the local user interface, the measurements will
start scrolling on the display. This enables the user to view
all the measurements through the window of the main
cover.
Valve position
(
POS
) shows the valve travel position in per-
centage (
%
) of full scale. Optional unit is angle.
Input signal
(
LOOP
) shows the input signal value in mA.
Safety input signal
(
INP
) shows if the mA signal is below
trip state threshold 6.0 mA (
OFF
) or in the normal level,
above 16.0 mA (
ON
). Between 6.0 and 16.0 mA it can be
either ON or OFF depending on the direction of the signal
change.
Actuator pressure difference
(
PDIF
) shows the actuator
pressure in single acting actuators or pressure difference in
double acting actuators in bars (
BAR
). Optional unit is psi
(
PSI
).
Housing pressure
(
Pint
) shows the pressure inside the
enclosure in bars (
BAR
). Optional unit is psi (
PSI
). Too high
housing pressure may prevent VG9000 to perform the
safety action. There is alarm limit for this. It is set for 0.2 bar
as default.
Supply pressure
(
SUPL
) shows the air supply pressure
value in bars (
BAR
). Optional unit is psi (
PSI
).
Device temperature
(
TEMP
) shows the temperature inside
the device in degree Celsius (
C
). Optional unit is degree
Fahrenheit (
F
).
Fig. 15
Local user interface (LUI)
Table 4
Default / optional units of measurements
Measurement
Default unit
Optional unit
Valve position (POS)
Percentage (%) of full
scale
Angle (ANG), where 0 %
refers to 0 (angle)
Input signal (LOOP)
mA
%
Safety input signal
(INP)
-
-
Actuator pressure
difference (PDIF)
bar (BAR)
psi (PSI)
Housing pressure
(Pint)
bar (BAR)
psi (PSI)
Supply pressure (SUPL) bar (BAR)
psi (PSI)
Device temperature
(TEMP)
°Celsius (C)
°Fahrenheit (F)
Fig. 16
Measurement monitoring and unit change
— continuous push
— brief push
