VESDA VLF-500, Руководство по эксплуатации продукта

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VESDA by Xtralis VESDA VLF-500 Product Guide
www.xtralis.com 55
12 Frequently Asked Questions (FAQ)
Note: For FAQs not specifically related to VESDA VLF, please visit www.xtralis.com.
What are the order numbers for the VESDA VLF detectors?
Part Numbers can be found on the datasheets (visit www.xtralis.com to download datasheets).
Where do I obtain an approval certificate for my VESDA VLF?
Visit the approval website or www.xtralis.com for the latest information.
What do the buttons on the VESDA VLF front panel do?
The RESET button resets all latching faults.
The DISABLE button disables the fire relay outputs and reports a fault.
Pressing the DISABLE button for 6 seconds will put the detector into Stand-by mode.
Pressing RESET and DISABLE simultaneously accesses the Instant Fault Finder function. A number flashes
on the round display to indicate which fault, if any, is present. The user interface is described in the user
panels beneath the service door.
The TEST button simulates a Fire 1 alarm condition and the alarm relay is activated after the appropriate
delay. Before pressing this button, you must ensure that the reporting device is isolated to prevent the
initiation of FIRE response actions.
AutoLearn Flow and AutoLearn Smoke will start the environment study to create specific thresholds for
the area being covered, assuming that the environmental conditions during the study period are comparable to
normal operating conditions. The default period for AutoLearn is 14 days. Pressing the
AutoLearn Flow
button also normalizes the detector’s airflow.
Pressing an AutoLearn button a second time aborts the AutoLearn function.
What are the permissible flow normalisation limits for VESDA VLF detectors?
VESDA VLF-500: minimum = 12 liters per minute, maximum = 54 liters per minute
What do I do if my VESDA VLF is showing a flow rate of 0 l/min?
Check whether the unit is in standby mode on the front panel. Pressing the standby button for 6 seconds will
cancel this mode, however, it is advisable to first identify the reason for the detector being in standby mode.
Xtralis VSC will also indicate standby mode, usually with a blue box that surrounds the detector in the Xtralis
VSC device tree. Check if there is a FLOW SENSOR FAIL fault. If there is, you will need to return the
detector for repair.
Why did VESDA VLF AutoLearn Flow fail?
If the flow rate is outside of the detector operating limits, AutoLearn Flow will not work.
Why is VESDA VLF AutoLearn Smoke having problems?
If a FIRE is detected, AutoLearn is aborted and the appropriate alarm raised. Environments with a high
background smoke or pollution level, where this background exceeds the original threshold levels, will also
cause AutoLearn to abort. AutoLearn should be run when the environment is displaying typical operating
conditions. The default AutoLearn period is 14 days.
When the Instant Fault Finder is pressed (Reset + Isolate buttons together), why do the AutoLearn
Flow and AutoLearn Smoke LEDs start flashing instead of the fault numbers lighting up? The
flashing stops when the blue buttons are released.
You have not pressed BOTH the RESET button and the DISABLE buttons simultaneously, you have ONLY
pressed the DISABLE button. To put the VESDA VLF into STANDBY you press and hold down the DISABLE
button until the AutoLearn LEDS and DISABLED LED blink. This means keeping the button pressed for about
6 seconds. You do the same again to take the detector out of STANDBY. So, what you are doing is the 1st
stage of putting the detector into/out of STANDBY. To make IFF work reliably, you need to press the RESET
button BEFORE the DISABLE BUTTON. Several seconds can elapse between pressing these buttons but
take care that you do not RESET the detector by accident.