VESDA VFT Product Guide
VESDA by Xtralis
26 www.xtralis.com
Notes:
l Avoid setting to values already defined for Level 1 or 2 Access Codes.
l To revert all Configuration parameters to their factory default values go to the LOAD DEFAULTS
menu item and press ENTER (Level 2 Access Code is required). The Unit will restart with default
parameters.
OPCODE
This is the Operator Access Code (or Access Code Level 1 or 2) that must be entered to enable ISOLATE,
SOUNDER SILENCE and RESET buttons. The default value is 0. It may be changed within the range 0 to
999, but 260 and 693 should be avoided as these are reserved for Level 1 and 2 access codes. A zero value
removes the need to enter an Access Code.
ENDSCTR
The default value is 15. If fewer sectors are to be sampled, ENDSCTR should be set accordingly and the
unused sample inlets should be looped to one another.
Those used should be a contiguous set beginning from the first inlet.
DENSLOG
If there is a change in density greater than or equal to this value, an entry in the log is made of the new value.
TRCLTCH, ALTLTCH, ACTLTCH, F1LTCH, F2LTCH
Defines whether Alarm events are to be latched. If not latched, the Alarm condition will clear as soon as the
cause disappears. If latched, the system must be reset to clear the Alarms. Note that the ACCEPT or
SOUNDER SILENCE buttons may be used to stop the internal sounder, and the ISOLATE button may be
used to disable all Alarm relays. The default is 1 (Latching).
FLTLTCH
A FAULT condition will exist if any specific fault within the system is detected. It will be accompanied by
closure of the Normally Closed contacts of the FAULT relay, and illumination of the GENERAL FAULT
indicator. If it is made Latching, the relay contacts and indication will remain even after the originating Fault
condition has ceased, and the system must be reset to clear FAULT. The default is 1 (Latching).
TRCRLY
Optionally, the ALERT relay can be re-assigned to activate when the detector goes into TRACE mode. To do
this set it to 1. The default is 0. The Alert relay will then act as a Trace relay.
When the TRCRLY parameter is set to 1, an Instantaneous Fire feature is also enabled. The Instantaneous
Fire feature allows an overall Fire 1 alarm to be immediately generated once the overall smoke level exceeds a
diluted Fire 1 threshold. The diluted Fire 1 threshold is determined by selecting the highest of two threshold
values:
1. The Trace threshold; or
2. A diluted threshold calculated from taking the lowest active Sector Fire 1 threshold and dividing it by
the number of active sectors.
Note: The Instantaneous Fire feature is only available to units with Firmware Build 407 or greater.
REFCOMP, REFDEL
Not used. Leave at default settings.
FLOWLOG
If there is a change in flow greater or equal than this value and there is currently a flow fault, an entry in the log
is made of the new value.
FLOWDEL
Flow Fault Delay. The time period in seconds for which a Flow Fault must be sustained before registering as a
fault. The default is 5 seconds. The range is 1 to 60 seconds.
FLOWHI, FLOWLO
High and Low limits set for Flow Fault. Note that Flow readings are normalized to 100%. All systems must
normalized at the installation stage. Refer to Section 4.1 and Appendix C for further information.
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