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Document: LT0273 MX4428 MXP Engineering / Technical Manual
Device Information and Programming
Issue 1.5 24 March 2006 Page 3-51
3.25 AVF / RAD / SAD / FLOWSWITCH DELAYS
AVF/RAD or SAD or FLOWSWITCH or AVF/SAD may be configured for a “circuit” and will
apply to all input devices on the circuit except CP820 devices, and MIM801 devices with
“interrupt” enabled.
3.25.1 AVF/RAD
Note that AVF is usually unnecessary on the addressable detectors as the built in filtering
already provides significant protection against false alarms. AVF provides an additional time
delay to verify that the alarm is still present at the end of the AVF delay. It operates as
follows –
Time Action
0 Alarm detected at detector or module - not sent to MX4428.
5 seconds Reset detectors (remove power) on DIM module.
Do nothing on other modules.
10 seconds Remove reset to detectors on DIM module (re-apply power), and set alarm
count to 0 for DIM module (requiring count up to 6 for alarm recognition).
15 seconds Resample detector or module, if still in alarm condition then alarm is
transmitted to MX4428 immediately.
15 – 135
seconds
Immediate recognition of alarm condition and transmission to MX4428.
135 seconds If no alarm start again.
3.25.2 SAD
All devices on circuits set up as “SAD” at the MX4428 have the “return to normal” signalled
to the MX4428 delayed by 60 seconds. If the state goes back into alarm during this time, the
timer will be reset.
3.25.3 AVF/SAD
All devices on circuits set up as “AVF/SAD” at the MX4428 delay into alarm as per AVF/RAD
and delay out of alarm as per SAD.
3.25.4 FLOWSWITCH
All devices on circuits set up as “Flowswitch” at the MX4428 have the alarm signalled to the
MX4428 delayed by 15, 30, or 60 seconds (depending on the MX4428 programming). If the
state goes out of alarm during the delay time, the timer will be reset.