VESDA
®
LaserCOMPACT Product Manual
Version 1.0
7
2.8 Auxiliary
Terminals
The auxiliary terminals on the termination card are
Bias
,
Reset
and
LED
. Refer to Section 4.7
for wire connection details. These terminals have the following functions:-
Bias terminals
These output terminals provide 10VDC supply to power the Reset input
terminals via a remote ON/OFF switch.
LED terminals
These output terminals provide a 5V, 15mA DC supply via a 220 ohm resistor
to drive an LED located in another part of the building.
Reset terminals
These terminals are also known as the General Purpose Input (GPI) and is
(GPI Input)
used for one of these three functions;
Reset
,
Mains
OK
or
Standby
. The
Reset terminals can be programmed to one of the functions if required and
requires 5V to 33VDC to operate. Any input into this terminal overrides the
Reset switch on the front panel. These functions operate as follows:-
Reset/
Isolate
The detector Isolates when
≥
5 VDC is applied to this terminal and
Reset when the voltage drops
≤
2 VDC.
Mains
OK
The detector monitors the state of the external power supply and
responds to the following conditions.
Mains OK
≥
5 VDC is at this terminal
Mains Fail
≤
2 VDC is at this terminal
Standby
The detector Isolates and the aspirator turns OFF when
≥
5 VDC is at
this terminal.
Note:
The input states are not defined for any voltages > 2 to < 5 VDC.
2.9 Cable Entry Ports
There are four 25 mm (1in)
∅
cable entry ports on the top right hand side of the detector. Any of
the ports can be used to run the cables into the detector. Refer to Figure 4, 6 and Section 3.4 for
more details.
2.10 Event Log
The detector stores and logs up to a maximum of 12,000 events on a first in first out basis. By
regulation, detectors are normally required to be powered from a battery backed DC power
supply. This ensures that the log is held indefinitely. If it is required to totally remove the DC
power source and it is considered the log may hold useful then the user should download the log
into a PC using VConfig Pro software program before disconnecting the DC power.
