Tyco MX4428 technical manual AVF / RAD / SAD / Flowswitch Delays, Time Action

Document: LT0273	MX4428 MXP Engineering / Technical Manual
	Device Information and Programming

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.

3.25.1AVF/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	Immediate recognition of alarm condition and transmission to MX4428.
seconds
135 seconds	If no alarm start again.

3.25.2SAD

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.

3.25.3AVF/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.

3.25.4FLOWSWITCH

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.

Issue 1.5 24 March 2006 Page 3-51