Pertronic VESDA LaserSCANNER Quick start guide

PERTRONIC INDUSTRIES LTD
VESDA®PSU Installation Note
PERTRONIC INDUSTRIES LTD 0520-VESDA PSU Operating Instruction Issue 9, 200804
Operation:
The VESDA®Power Supply Unit incorporates a 1.5 amp switching regulated power supply with
voltage monitoring and battery test facilities.
The VESDA PSU was initially designed for use with the VESDA range of aspirating detectors. It
supports the following Brigade connected (24 Hour Standby) detectors:
Model Maximum Charge Current Battery Size
LaserSCANNER 1 0.82A 12AHr
LaserPLUS 1 0.82A 12AHr
LaserCOMPACT 4 1.4A 18AHr
LaserFOCUS : VLF-500 1 0.84A 12AHr
LaserFOCUS : VLF-250 2 0.9A 12AHr
If more detectors or batteries larger than 12Ahr are required, use the 24V/4A Switch Mode PSU.
If the peak current drawn from the power supply exceeds 2.5A, then the output load should be
connected directly to the Battery terminal block—the in-line polyswitch is rated 2.5A
Indicators:
The green Mains On LED illuminates when the Mains supply is present.
The red Overload-Recharge LED illuminates when the Charger load exceeds 1.3A.
The yellow Autotest LED glows during the daily power supply test. The Power Supply Unit
monitors the Battery voltage and also performs a Battery Capacity Test every 24 hours by
reducing the power supply voltage to 22.0Vdc for 60 minutes.
If the RESET switch is pressed for more than 1 second, the 60 minute Battery Test starts and
the Autotest LED turns ON. Subsequent Battery Tests occur every 24 hours from this time.
Fault Monitoring:
The Fault relay—located at the bottom centre of the PCB—is normally energised, de-energising
after a delay to indicate that a defect has occurred.
Delays for the various Fault types are shown in the following Table:
Fault Value Encoded Pulse Delay Before Fault
Relay Activates
High Battery/Charger Voltage > 28.8Vdc 1st 55 minutes
Low Battery (When Mains is off
or the Charger in Test mode) < 24.3Vdc 2nd 55 minutes
Battery Missing (Charger in Test
mode)
Battery Missing (Charger not in
Test mode)
< 23.6Vdc
Checked
every
10 secs
3rd
25 seconds
15 seconds
Mains Lost 4th 1 hour
Encoded Fault Indications and Fault Relay Delay times
Four non-latching Fault conditions are detected:
The yellow Battery Fault LED indicates which fault conditions are active.
The indication is immediate for High, Low Battery, Battery Missing, and Mains Lost
faults; but the fault relay is delayed in de-energising, as the table above shows.
Momentary operation of the RESET switch restarts the 24-Hour Timer. The battery test
commences 23 hours after reset, and then every 24 hours subsequently.
The power supply frequency is the reference for the timing functions. The Power Supply adjusts
automatically for 50Hz and 60Hz supplies. When the Mains supply is absent, an internal clock
provides reference until the Mains supply is restored.

PERTRONIC INDUSTRIES LTD
VESDA®PSU Installation Note
PERTRONIC INDUSTRIES LTD 0520-VESDA PSU Operating Instruction Issue 9, 200804
BatteryLoad
If Peak Load Current is >2.5 Amp
move the Load termination
from DC OUT to BATTERY terminals
Mains
O’Load
Auto
Test
Fault
Mounting:
The power supply is designed as a wall mounting unit and should be mounted in a clean dry
area in such a way that natural convection between the unit and the wall and through all other
cooling slots is not restricted in any way.
Connectors:
Mains (K1): a 3-terminal block with an integral three-pole switch for Mains wiring.
Battery (K2): a 2-terminal block for Battery wiring.
DC OUT (K3): a 2-terminal block to connect the load – use only if peak load current is less
than 1A.
Care should be taken to prevent reverse polarity connections between the power supply and
load.
Fault Relay (K5): provides clean C-NC-NO contacts rated 1A @ 24Vdc.
Commissioning:
It is recommended that the power supply initially be connected to the Mains without the load
connected. The green Mains On LED should be ON. The load should then be connected to the
power supply and run without the batteries connected. The red Overload LED should remain
OFF. If the red overload LED turns ON, the load is too great for the power supply. If this is so,
the batteries will recharge very slowly or not at all. With the load connected, connect the two 12V
batteries to the power supply—take care to observe the correct polarity.
Press the RESET switch for 1 second. The Autotest LED turns ON, indicating the 24-Hour Test
has started. Check for any Fault conditions, and press RESET momentarily to reset the
Autotest and the Autotest Timer. Future Auto Tests will occur 23 hours after the reset.
Installation Diagram: