EQUIPMENT: FIRECLASS Prescient III WRITTEN BY: RKP
PUBLICATION: OMFCPRES3IN CHECKED BY: AP
ISSUE No. & DATE: 0 02/02/12
PAGE 7 of 43
Figure 4 – Prescient III Block Schematic Diagram
Zone 1
Zone 2
Aux Zone
Gas
Released
Gas
Low
Isol Valve
Abnormal
Isol Valve
Closed
Act 1**
Act 2**
Gen Sndr 1**
Gen Sndr 2**
Ext Sndr**
Gas Released
[Routing]**
Gas Released [SLU]
Gas Manual [SLU]
Gas Auto [SLU]
1st stage Plant
Shutdown **
Fire Sig
[Routing]**
Fault Sig
[Routing]**
Timer Hold [SLU]
Release Aborted [SLU]
+24V AUX 1A Output
2nd stage Plant
Shutdown **
Aux Reset
Coincidence
detection
zones
Auxiliary
detection zone
Panel
Manual
Release
Gas discharged
pressure switch.
Gas Low
[Low pressure
switch/low weight]
[Valve Closed]
[See valve
wiring diag]
Gas isolation
valve.
[Valve Stuck]
Fire
Z1
Fault/
Disabled
Z1
Fire
Z2
Fault/
Disabled
Z2
Fire
Aux
Fault/
Disabled
Aux
Gas
Released Fault
Gas Low
* = Open & short cct flt
monitored input
*
*
*
Open & short cct flt monitored
I/P. 680 Ohm = Ext Low
Open & short cct flt
monitored I/P.
680Ohms = V/Closed
2K2 = V/Abnormal
General
Fire
Sounder
Test
General
Fire
Sounder
Fault/
Disabled
Sndr 1
flt
Sndr 2
flt
Internal
Act 1 flt Act 2 flt
Internal
Extinguishing
Disabled
Aux DC Supply Max O/P
1A Fused
Active on any fire Z1 or
Z2 in auto, Man Rel or
Gas Released P/S signal
Pulsed when Z1 & Z2 in alarm
in auto, or Man Release active.
Continuous on actuator
activation or discharge
Pressure SW I/P signal active
Max O/P: 0.5A
** = Open & short circuit
monitored output
Active on coincidence
fire on Z1 and Z2 in
auto, Man Rel or Gas
Released P/S signal
Fire Sig
[Routing]
Active
Fault/
Disabled
Fault Sig
[Routing] Fault/
Disabled
S/D Outputs
Disabled
Gas Rel
Signal
[Routing]
Active
Disabled
Operates on any fire
Z1,Z2,Aux Zone
Link configurable O/Ps:
Link ON:
Open/short cct fault
monitored, powered at
24 VDC when active.
Link OFF:
1 x Volt-Free Change-
over relay contact
[Rated 1 Amp @ 24VDC]
Operates [de-energises]
on any fault including
Valve Abnormal but not
Valve Closed
Operates on Gas P/S
active I/P or Actuator
operated when in "No
Discharge P/S" mode
Open collector O/Ps
each rated 50 mA
1 x V/F C/O relay contact
[Rated 1 Amp @ 24VDC]
Operating for 10
seconds after
operation of Fire
Reset switch
*
*
*
3rd stage Plant
Shutdown **
Active on Actuators
operated (if no
Discharged Pressure
Switch) or Gas
Released P/S signal
Each Plant Shutdown O/P has:
1 x OP, link configurable as fault
monitored/powered when active [as per fire
routing O/P] or 1 x V/F C/O relay contact
rated 1 Amp @ 24 VDC.
S/D
O/P
1 flt
Internal
S/D
O/P
2 flt
S/D
O/P
3 flt
Gas Trapped
Pressure
Switch
Gas Trapped
in Manifold
+24V AUX 250mA Output
Max O/P 0.25A [Fused]
Internal
Ext Sndr Fault
Release Disabled [SLU]
RP - E/Hold Active
or Panel in Auto
RP - E/Abort Active
or Panel in Manual
RP - Isol Valve Closed
RP - Isol Valve Abnormal
RP – Actuators (Extinguishing)
Disabled
Internal
Fault
Internal
Auto
&
Manual
Manual
Only
Fault
Internal
E Abort
Active
Fault
Internal
E Hold
Active Fault
Internal
Isolation
Valve
Abnormal
Isolation
Valve
Closed
Fault
Internal
Gas
Trapped in
Manifold Fault
Internal
0V AUX 1A Output
Release Count Down[SLU]
RS485 serial
data [SLU]
To Status
Indicator/
Controller
SLU
Fault
Internal
Man
Rel
Active
Man
Rel
Fault/
Disabled
Internal
Gas Rel Sig
[Routing] Fault
Conventional
Manual Release
Zone
Manual
Release
Conventional
E Hold input
Emergency
Hold
Conventional
Abort input
Emergency
Abort
*
*
*
*
Conventional
Auto/Manual
switch input
Auto/Manual
Lock Off
*
RCI
Remote Controls Input:
4K7 = Sound Alarms
1K8 = Silence Alarms
560R = Reset Panel
Remote
Sound
Alarms
Active
RCI
Fault
*
RP - Fire Z1
RP - Fire Z2
RP - Fire Aux Zone
RP – Manual Release Operated
DIL Switch
Selectable
Continuous for fire on
Z1, Z2, Aux Zone.
Also for Remote Sound Alarm
Max O/P: 0.5A
Operate on Pre-discharge
Timer Ended or Man Release
in Immediate mode
Max O/P:1 Amp
Internal
Fault
Panel
MR
Internal
Fault
External
MR
Extinguishing
Reset
Inhibit
Active
Illuminates steady
while Extinguishing
Reset is Inhibited
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