VESDA Commissioning Guide VESDA by Xtralis
8 www.xtralis.com
Check that all electrical installations meet the requirements of local electrical codes and standards.
Data communication between detectors is done through VESDAnet. The communication between devices
connected to VESDAnet is bidirectional. The polarity must be maintained throughout the network. It is
recommended that RS 485 (Belden 9841 - 120 ohm) twisted pair cables (or similar) be used. You must ensure
that the VESDAnet is appropriately wired for a closed or an open-ended loop. Refer to the VESDA
Communications Guide for further information.
You should now powerup the system.
l The system takes approximately 15 seconds to power up
l If the system or any detector on the VESDAnet fails to power up, re-check that all power wires are
securely connected to their respective terminals and the polarity is correctly maintained
During power up different things will occur on different detectors at different times:
l For all detectors, the aspirator starts to spin and suck air
l VESDA VLP and VESDA VLS detectors that have the LCD Programmer module fitted will display the
word VESDA
l VESDA VLP, VESDA VLS or VESDA VLC detectors that have a display module fitted or remotely
mounted will have the following indicators lit:
l Fire alarm threshold indicators
l Smoke threshold levels on bar graph (if there is sufficient background levels)
l Two digit numerical display
l Various fault Indicators if there are any faults
l System OK indicator if there are no faults
l VESDA VLF detectors:
l First the Power and Fault lights appear
l Next, all parts of the display will light up
l Finally, just the Power light will be left on
l VESDA VLC detectors:
l Will light up and cycle LEDs on and off
l If a fault has been detected the FAULT LED indicator will remain lit
l If the system is functioning normally the OK LED indicator will remain lit
The detector(s) may show faults immediately after power up and this is normal. Reset the detector(s) to
unlatch the relays and fault LEDs. The fault LEDs on any display connected to the system will light up (this is
normal).
If any of the above does not happen, refer to the product guide for that detector and check that the detector
and VESDAnet have been correctly installed.
3.3.2 Preliminary Systems Check
Conduct a preliminary systems check before you begin commissioning. The check can be conducted by
using a LCD Programmer or using Xtralis VSC software. The preliminary systems check should include
conducting a VESDAnet communications check for each detector.
At power up or when changing site requirements a range of faults will be generated. This is normal. To silence
the faults you can accept the factory defaults, but you MUST remember that you still need to configure the
detector to suit the customer site. For further information see the product guide for the detector or the VESDA
Troubleshooting Guide.
Change the settings to suit site requirements:
l Normalizing the air flow - Normalize the air flow using the LCD Programmer or Xtralis VSC Software
l Create smoke at the farthest sampling hole from the Detector to confirm that the detector registers the
presence of smoke within the time anticipated by ASPIRE2 but also within the maximum time according
to local codes and standards. This test should be conducted for each pipe to ensure that there is no
blockage or leakage in any of the sampling pipes
The LCD Programmer Guide and the Xtralis VSC Software Online Help explains how to carry out the
functions. For information on smoke tests please refer to Section 5.1.
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