Pertronic VESDA LaserSCANNER Installation Notes

PERTRONIC INDUSTRIES LTD
®
Installation Note
VESDA PSU
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
LaserSCANNER
LaserPLUS
LaserCOMPACT
LaserFOCUS : VLF-500
LaserFOCUS : VLF-250
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
High Battery/Charger Voltage
Low Battery (When Mains is off
or the Charger in Test mode)
Battery Missing (Charger in Test
mode)
Battery Missing (Charger not in
Test mode)
Mains Lost
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
Maximum Charge Current
1
1
4
1
2
Value Encoded Pulse
> 28.8Vdc
< 24.3Vdc
< 23.6Vdc
Checked
every
10 secs
0520-VESDA PSU Operating Instruction Issue 9, 200804
Battery Size
0.82A
0.82A
1.4A
0.84A
0.9A
Delay Before Fault
Relay Activates
1st 55 minutes
2nd 55 minutes
25 seconds
3rd
15 seconds
4th
12AHr
12AHr
18AHr
12AHr
12AHr
1 hour