VESDA VLI Product Guide
VESDA by Xtralis
24
www.xtralis.com
3.2.5
Relays
The relays, located on the main processor card, interface to the Fire Alarm Control Panel (FACP) to
communicate faults, alarms and disabled states.
Fault and Fire1 Relay Terminals
Fault (Trouble) and Fire1 (Alarm) relay terminals are located on the main board inside the detector.
The Fault relay is energized during normal operation while the Fire1 relay is only energized when a Fire1 is
detected. The operation of the relays are summarized in the following table.
Table 3-1: Fault and Fire Relay Operation
FAULT Relay
FIRE1 Relay
Normal Operation
(Energized)
Fault
or unpowered state
Normal Operation
(De-energized)
Fire
Programmable Relays
The three additional relays can be programmed using Xtralis VSC software or the LCD Programmer if the
detector is on a VESDAnet. Refer to the Xtralis VSC Online Help or LCD Programmer Product Guide for
details.
3.2.6
Unmonitored General Purpose Input (GPI)
The GPI is a programmable input which can be configured to initiate a number of different actions, including,
by default, a Remote Reset function. Refer to Section 5.5.4 on page 43 for further information.
Notes:
l
When the detector is disabled or set to standby via the GPI, the status cannot be changed through the
normal enable / disable functions on the Display Module or the LCD Programmer.
l
When the night-time thresholds are invoked via the GPI, the clock settings for day-start and night-start are
overridden.
The GPI requires a voltage supply between 5V and 30 VDC from the connected device in order to operate.
The input is isolated from the system by an opto-coupler device.
3.2.7
Monitored General Purpose Input (GPI) Wiring
Monitored GPI is available on the VLI-885 detector. It includes the same functions as the unmonitored GPI,
with power supply monitoring as the default setting.
With monitored GPI, the detector monitors the GPI for open or short circuit faults when the GPI function is set
to any value.
When the GPI function parameter is set to Mains OK, the detector indicates an external equipment fault
condition by monitoring the line impedance. A 2K7 End of Line (EOL) resistor is supplied with the product and
must be assembled in parallel with the device to be monitored.
The EOL resistor provides a known termination to the external equipment, this allows the VLI detector to
identify open or short circuits.
Note:
When monitored GPI is set to Inverted Reset, GPI ON/OFF senses changes. A short circuit sets
GPI OFF and EOL sets GPI ON.