SCS_BA_EV-301_601_EN_12 groupscs.co.uk Date: 31.05.2023
Issue: 1.2 / 06.2023 info@groupscs.co.uk
Page 13
SP Mode Functions
6. SP Mode Functions
6.1. Alarm Functions
In the event of a re alarm or override condition the panel will
enter an Alarm mode. Alarm modes take priority and will disa-
ble sleep modes and all daily ventilation functions. There are
3 dierent alarm conditions FAS Alarm, override, and lockout.
In alarm the vent output will continuously power the vent to its
position and shall not switch o. If an Open & Close command
is received simultaneously the last command takes priority.
In alarm the panel will output 24V to Override Switch A1 ter-
minal sending alarm signals to remote panels such as Head
of Stairs & Head of shaft panels. The A1 terminal is a bi-direc-
tional bus for linking panels together.
Table 1: Switch SW1 – Alarm Functions
SW1 ON OFF Function
6 Auto reset Manual
Reset
FAS reset behaviour. Automatic
reset when FAS input returned he-
althy. When set to o a manual reset
from override switch is required.
5 Close Open Vent default position on FAS Alarm.
6.1.1. FAS Alarm
An alarm triggered by a smoke detector or re alarm input
when in normal operation with no other alarms active. For
head of stair and head of shaft panels an alarm is triggered
when a signal is received from a remote panel. The vent out-
put will automatically OPEN or CLOSE according to SW1-5
switch selection.
FAS Alarm conditions are:
● Smoke detector FAS1 – input B2 detects a line fault
● Fire alarm FAS2 – input B3 detects a line fault
● Remote alarm signal detected on FAS2 input A3
6.1.2. Override
An override alarm can be triggered by one of the following
conditions:
● By pressing the EV-HE077 override switch OPEN button
for >0.5 seconds when in normal operation with no alarms
active.
● When the Override Switch input B1 detects a line fault
(short or open circuit condition across the terminating
resistor)
● Receipt of a Databus override Open or Close command
The vent output to automatically OPEN on an override alarm
except for a Databus override Close command when the vent
output will CLOSE in alarm.
When in alarm pressing the EV-HE077 override switch
CLOSE/RESET button for >0.5 seconds will trigger an
override close command. By pressing the OPEN button for
>0.5 seconds will trigger an override open command. The
vent output will respond to the last override open or close
command if permitted.
The last Databus override Open or Close command received
will take priority.
All override commands are ignored when in Lockout.
6.1.3. Lockout
The panel enters a lockout mode when a 24V alarm signal
is detected on Override Switch A1 terminal from a remote
panel when in normal operation with no alarms active. The
vent output will automatically lockout CLOSE and ignore all
OPEN commands.
6.2. Alarm Reset
The panel can be reset when all these conditions are met:
● Override Switch – input B1 line is healthy
(terminating resistor in circuit)
● Smoke detector FAS1 – input B2 line is healthy
(terminating resistor in circuit)
● Fire alarm FAS2 – input B3 line is healthy
(terminating resistor in circuit).
● Remote alarm signal on FAS2 – input A3 is o
● Linked remote panels to Override Switch A1 terminal are
not in FAS alarm
● Databus Open & Close commands are o
If an alarm condition is present following a reset the respecti-
ve alarm will retrigger.
A manual reset command is triggered by pressing the
EV-HE077 override CLOSE / RESET or the onboard RESET
button for >5 seconds. A reset is also be triggered when a
Databus Reset command is received.
The automatic reset function can be set by switch SW1-6.
A reset is automatically triggered when all the reset condi-
tions are met following an alarm condition.
With a smoke detector FAS1 input reset the automatic reset
function will trigger after 30 minutes.
With a re alarm FAS2 input reset the automatic reset function
will trigger immediately.
A reset function will cycle the power to FAS1-B2 & FAS2-B3
terminals for 3 seconds to reset smoke detectors. If the smoke
detector fails to reset the system will retrigger the FAS alarm.
When the daily ventilation function is set to Continuous Close
the vent output will automatically CLOSE after an alarm reset.
When the daily ventilation function is set to Dead-man Close
the vent output will remain open after an alarm reset. The
vent must be manually closed by one of the following com-
mands:
¾ Press and hold the EV-HE077 CLOSE / RESET button
until vent closed
¾ Daily close Input Z held on until vent closed
¾ Databus DailyClose command held on until vent closed
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