GROUP SCS EV-601 - EV Mode Functions

EV Mode Functions
SCS_BA_EV-301_601_EN_12 groupscs.co.uk Date: 31.05.2023
info@groupscs.co.uk Issue: 1.2 / 06.2023
Page 16
7. EV Mode Functions
7.1. Start-up
On start-up any panel operation is locked out until a valid
Databus watchdog signal is received from the Master panel.
In a start-up lockout condition the following occurs:
● Vent outputs will be switched o󰀨.
● All FAS alarm and EV-HE077 override inputs shall be
ignored.
● Relay will be in last known state before power-up or
condition set in SIMON LINK.
● The EV-HE077 will indicate fault condition.
7.2. Master Watchdog
When a valid Watchdog signal is received from a Master
panel the Databus commands are enabled. This permits the
panel to start responding to the Databus commands received
and all FAS alarms & EV-HE077 override inputs become
active.
If a valid Watchdog signal is not received within 60 seconds in
any condition the panel will enter a lockout mode:
● Vent outputs will remain in their last position.
● All FAS alarm and EV-HE077 override inputs shall be
ignored.
● Relay will remain in its last position or condition set in
SIMON LINK.
● The EV-HE077 will indicate a fault in normal conditions or
remain in alarm in emergency conditions.
7.3. Standalone Mode
Standalone mode is selected when SW2-10 is ON. This
mode is used for isolated commissioning and maintenance
activities. In standalone mode all Databus commands are
ignored except for the Reset command. The panel will ope-
rate in SP mode responding to local FAS alarm inputs and
EV-HE077 override commands only. An alarm can be reset
by a Databus reset command. The watchdog monitoring is
ignored so power-up and watchdog lockout conditions are
disabled.
7.4. 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
disable all daily ventilation functions.
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 ta-
kes priority.
SW1 ON OFF Function
6 Auto reset Manual
Reset
FAS reset behaviour: Automatic reset
when FAS input returned healthy.
When set to o󰀨 a manual reset from
override switch is required.
5 Close Open Vent default position on FAS Alarm.
7.5. FAS Alarm
An FAS alarm is 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 output 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
7.6. Override
An override alarm can be triggered by one of the following
conditions:
● By pressing the EV-HE077 override 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 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.
7.7. Alarm Reset
The panel can be reset when all these conditions are met:
● Override Switch input B1 line is healthy (terminating re-
sistor 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 any alarm condition is present following a reset the active
alarm will retrigger.