EQUIPMENT: FIRECLASS Prescient III WRITTEN BY: RKP
PUBLICATION: OMFCPRES3IN CHECKED BY: AP
ISSUE No. & DATE: 0 02/02/12
PAGE 10 of 43
raises the general fault condition. An open or short
circuit fault is indicated by the Circuit Fault LED on
the display and a Gas Low Fault LED on the
motherboard. The input is configurable for
normally open or normally closed operation via a
DIL switch on the motherboard.
3.9.8. Extinguishing Isolation Valve Status
(ISO. VALVE)
This is a fully monitored input, providing open &
short circuit fault monitoring. The EOL device is a
10k resistor, giving an „ISOLATION VALVE
ABNORMAL‟ indication. An open or short circuit
fault is indicated by the Circuit Fault LED on the
display and a Isolation Valve Fault LED on the
motherboard. Three states are possible on the
input:
1. Valve Closed:
Activated by a 680R resistor; flashing the
Valve Closed LED on the display board &
pulsing the internal buzzer.
2. Valve Open:
Activated by a 2k2 resistor; no indication is
given on the panel as this is the healthy state
for the input.
3. Valve Abnormal:
Activated by the 10k EOL resistor; flashing
the Valve Abnormal LED on the display board
& raising a general fault indication. A 2-
second delay is applied to the abnormal
condition to avoid momentary activation
during normal movement of the valve
between open and closed positions.
See Connection Diagram in section 12.3 for
details.
NOTE: The healthy state for the input is
VALVE OPEN and therefore, if the input is not
used, the input should have a 2k2 resistor
fitted.
3.9.9. Gas Released Pressure Switch (GAS
REL.)
This is a fully monitored input, providing open &
short circuit fault monitoring. The EOL device is a
10k resistor. An open or short circuit fault is
indicated by the Circuit Fault LED on the display
and a Gas Released Fault LED on the
motherboard. The input is activated by a 680R
resistor, illuminating the Gas Released LED on the
display, the Extinguishing sounder circuit, the Gas
Released Signal & all three shutdown outputs.
3.9.10. Emergency Hold (HOLD)
This is a fully monitored input, providing open &
short circuit fault monitoring. The EOL device is a
10k resistor. An open or short circuit fault is
indicated by the Circuit Fault LED on the display
and a Hold Fault LED on the motherboard. If a
fault occurs on the input during the Activated or
Discharged condition then the fault indication is
still given but the Hold Active LED is illuminated
steady and the Hold condition is established until
the fault is removed. This fault condition
prevents the Extinguishant release.
The input is activated by a 680R resistor,
illuminating the Emergency Hold Active LED on
the display and resetting & holding the pre-
discharge delay timer.
NOTE: If more than three Emergency Hold
switches connected to the Hold input are
operated simultaneously then a short circuit
fault will be detected. If this occurs while the
Pre-discharge timer is running, then the Timer
will still be reset and held until all switches are
released. Use only non-latching switches
which return to open contacts when the switch
is released.
NOTE: If a SLU with a Hold switch is
configured to transmit the Hold signal via the
serial communications path, a communication
fault on this path will initiate the Hold
condition, as described above, and the release
of extinguishant will be inhibited.
3.9.11. Emergency Abort Input (ABORT)
This is a fully monitored input, providing open &
short circuit fault monitoring. The EOL device is a
10k resistor. An open or short circuit fault is
indicated by the Circuit Fault LED on the display
and an Abort Fault LED on the motherboard. In
addition, the Abort Active LED will pulse if the
system is not in the Activated or Discharged
condition, clearing when the fault is cleared. If a
fault occurs on the input during the Activated or
Discharged condition then the fault indication is
still given but the Abort Active LED is illuminated
steady and the Abort condition is latched until
reset. This fault condition prevents the
Extinguishant release.
The input is activated by a 680R resistor,
illuminating the Emergency Abort Active LED on
the display and stopping the Extinguishant
release. The active abort condition is latched until
the input is cleared and the Extinguishing Reset
button is pressed.
NOTE: Use only LATCHING switches which
need to be manually returned to the OFF
position (this is a requirement of EN 12094-
1:2003 clause 4.27.2)
NOTE: If a SLU with an Abort switch is
configured to transmit the Abort signal via the
serial communications path, a communication
fault on this path will initiate the Abort
condition, as described above, and the release
of extinguishant will be aborted.
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