LTH MOD53, Operation Manual

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5 User Interface
30
Along with the LCD display, the front panel also incorporates five LEDs. The four
outer LEDs (labelled 1,2,3 & 4) indicate the set point status, i.e. when the LED is
illuminated the indicated relay is active. The centre LED indicates when the unit is
“Off-Line”.
Note: Not all relay channels may be fitted.
THE MENU SYSTEM
When the instrument is switched on, it will default to the main display menu. The
user interface to the MOD53 is arranged as a menu structure, a summary of which
is printed as a fold out sheet at the back of this guide. Movement around this
menu structure is achieved using the “PAGE”, “UP” and “DOWN” keys at the
bottom of the front panel. The functions within each menu are explained in detail
in the following sections of this guide.
ERROR MESSAGES
If the internal diagnostics have detected an error condition, the appropriate error
message will flash on the bottom row of the display. Pressing the “ENTER” key
when an error message is flashing will scroll a more detailed description of the
error along the bottom line. Pressing “ENTER” again will return the unit to the
flashing display. The error messages can be disabled within the “
Configuration ”
menu. If the error messages are disabled, the display will flash a bell symbol on
the far right of the bottom row when an error is detected. It is possible to configure
Relay 4 (if fitted) as an error relay to provide external indication of error conditions.
ACCESS ENTRY
To protect the instrument setup from unauthorised or accidental tampering, an
access code must be entered. The “
Access Entry ” menu will appear when the
“PAGE” key is first pressed from the main display menu. A character on the upper
right of the display will indicate whether access is permitted. The character will be
a key for permitted access and a padlock for denied access. By default the access
code will appear as 0000, however to unlock the instrument the correct code will
need to be entered.