LTMCU Physical Description - TeSys T User Guides

Front Face

The front face of the LTMCU is shown below:

1 LCD display

2 Contextual navigation keys

3 Front face RJ45 port for PC connection (covered)

4 Local control interface, including 5 control keys and 4 LEDs

For a detailed description of:

the LCD display and contextual navigation keys: see below.
the control panel interface: see Using the Local Control Interface.
the RJ45 port: see Connecting the LTMCU.

Navigation Keys

The LTMCU navigation keys are contextual, that is, their function depends on the associated icons shown on the LCD display. These icons change for different displays, so the navigation key functions also change.

The navigation keys can be used to:

navigate menus and sub-menus,
scroll within a value list,
select a setting in a value list,
exit a value list without making a selection,
return to the main (first-level) menu,
switch between manual and automatic presentation mode in Quick View display.

The diagram below shows an example of the different functions of each of the navigation keys associated with an icon on the LCD display:

1 Information area of the LCD display

2 Contextual navigation icons area of the LCD display

3 Move up to the next higher-level menu

4 Move down to the next item in the menu

5 Select an item

6 Move up to the previous item in the menu

7 Return to the main menu

Contextual Navigation Icons

The following table describes the icons used with the contextual navigation buttons on the LTMCU:

Icon	Description	Icon	Description
	Enables access to the main menu from a sub-menu or from Quick View		Enables access to Quick View from the main menu or a sub-menu
	Scroll down		Enables access to manual scroll mode (when Quick View is in automatic scroll mode)
	Scroll up		Enables access to automatic scroll mode (when Quick View is in manual scroll mode)
	Validates a setting or value and enables access to a sub-menu when a menu is selected		Used to increment a setting in menu mode
	Move up to the next higher-level menu		Used to decrement a setting in menu mode
	When a menu item is password-protected, this icon enables access to the Enter Password screen

Information Icons

The following table describes the icons provided as information in the information area of the LCD display. They indicate, among others, the selected menu or parameter.

Icon	Description	Icon	Description
	Main menu		Indicates that the present display is Quick View
	Metering setting menu		Indicates that an alarm has occurred
	Protection setting menu		Indicates that an error has been detected
	Control setting menu		Information
	Services menu		Check box selected
	Language selection menu		Check box unselected
	Radio button selected		Item has been selected (for inclusion in Quick View display)
	Radio button unselected		LTMR in Configuration mode

LCD Displays

The LTM CU presents 3 different LCD displays:

LCD display	Functions
Menu	Displaying and editing the configuration settings required for configuring the LTM R (metering, protection, control and services settings) Displaying diagnostic and history data
Quick View	Displaying real-time metering of pre-selected parameters by automatic or manual scrolling
Trips and Alarms	Displaying the most recent trip or alarm

Each of these 3 displays is described in detail below.

LCD Display Settings

The LCD display is continuously backlit.
Contrast and Brightness are adjustable by using the Services menu.