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4.2
General operation
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When first switching on the EPX
system,
the Normal display is shown: refer to
Figure
22. Press the On or Off button,
or any of the four menu buttons to exit the current menu and enter the corresponding new menu.
Figure 19
shows
this menu control logic.
Note that if a warning or alarm is displayed, the orange or red LED will flash until the warning or alarm is
acknowledged by pressing the
<ENTER>
button. Once acknowledged the LED will remain continuously lit. If a gas flow
warning is generated by low flow and then the gas flow is
restored,
the orange warning LED will flash until the warning
is acknowledged and will then go out.
4
.
3
The CANCEL button
Press the CANCEL button at any time during menu operation. For this
reason,
the use of the CANCEL button has not
been shown on all of the menu diagrams, but specific uses are shown where there is no other obvious way to cancel
the current menu option and enter the previous menu option. In
general,
when the CANCEL button is
pressed,
the
current menu option is cancelled and the previous menu option is
displayed.
Other specific uses of the CANCEL button
are as follows:
•
In the Switch On and Switch Off menus
(Figure 20
and
21
),
when pressing
CANCEL,
the menu is exited and the
display reverts to that which was displayed before On or Off was pressed.
•
In the Status menu
(Figure
23),
when pressing
CANCEL,
the display shows the first two status parameters (the
defaults are EPX current consumption and power
consumption).
•
When entering the password for the setup menu
(Figure
25),
if CANCEL is pressed before entering the
value,
the menu moves back to entry of the previous digit of the password.
4 .4
Display text and variable text
In the menu diagrams in
Figure 19
to
28,
text shown without chevron brackets in the two-line display symbol is the
actual text that will be shown on the display. In this
text,
the
'!:i'
symbol is used to show where a digit will be shown;
the value of the digit depends on the sensor data or information entered into the system.
Text enclosed in chevron brackets (for
example,
<status>) defines variable
text;
what is shown on the display
depends on the menu or the EPX system and data entered by the user. The following variable text markers are used
on the menu diagrams:
<status>
Text message giving status of the selected parameter.
<serial number>
This specifies the serial number. The serial number is a number which can be used to identify the EPX system in the
installation.
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<parameter>
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This is a previously selected parameter or menu option .
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<message>
This specifies a
warning,
alarm or advisory message.
Page 40
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Edwards limited
2017.
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