VAR4 / VAR12 / VAR20 - Operation Manual
Is
Page 282 of 308
Fault Indication, Acceptance and Clearance
sue: 03 complete, approved
20 Fault Monitoring
The mode of operation is fully compliant with BS5839: Pt 8: 1998 and BS54-2:1998 in the fault types that are
displayed and the mode of display.
Active faults, the system fault log, and the mainframe fault logs can be viewed on the LCD display. Active
faults can be accepted and cleared through the front panel buttons, or the ‘Faults’ menu.
L
BS5839 Pt 8 recommends that the user must be logged on to Clear Faults. However in some
circumstances it is desirable to remove access control from this function.
It is therefore possible, via an internal DIP switch, to select whether or not the Fault Clear
function is under access (log-on) control, see Section “23.2 Fault Clear Access Level”.
When the system has no faults present, the unit displays the current date and time on the LCD display and
indicates that the system is healthy.
VAR V2.9-2.5 12 Oct 2006 10:03:04
!Configuration" Tests Faults
If a fault occurs, then the unit displays text describing the fault. A display of the fault is alternated with a
display of the current date and time. In the event of multiple faults each fault is displayed in sequence, while
alternating with the date and time display. Faults are time and date stamped as they occur and added to the
fault log, see Section “20.4 Fault Log”.
VAR V2.9-2.5 12 REM01 COMMS
!Configuration" Tests Faults
It is possible to separately view a list of all currently active faults, see Section “20.1 Current Fault Status”.
Multiple faults can be examined by scrolling through the list by means of the front panel keys or rotary
encoder.
When a fault is detected the front panel ‘fault’ LED flashes, and the built-in loudspeaker emits an alarm tone.
The ‘fault’ LED may be steadied and the loudspeaker muted by pressing the front panel FAULT ACCEPT
key, or through the user interface’s ‘Faults’ menu, see Section “20.2 Fault Acceptance”.
Newly occurring faults cause the sounder to resume operation and the ‘fault’ LED to resume flashing.
Once a fault is physically fixed it is still latched on the LCD display. It is removed from the latched display by
pressing the front panel FAULT CLEAR key, see Section “20.3 Fault Clearance”. If a fault cleared in this way
still persists, then the fault warning condition will be restored within 100 seconds.
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