Siemens FIREFINDER-XLS Manual de inicio rápido descargar pdf (Pagina 53)

APPENDIX 1

ALARM VERIFICATION Alarm verification provides FireFinder-XLS with a way to verify an alarm from area

type addressable smoke detectors connected to intelligent loops (DLC or HZM). This

feature reduces the incidence of false alarms. Only detectors that do not contain an

integral alarm verification feature can be used.

Addressable detectors connected to DLCs indicate that an alarm condition has been

detected. If the device is subject to alarm verification, the DLC alerts the control

panel that the device has entered verification but is not yet considered to be in alarm.

The DLC starts a timer using the FireFinder-XLS system Retard-Reset Period pro-

grammed in the Zeus tool allowing conditions at the device to stabilize. When the

timer expires, the DLC begins the fixed 60-second confirmation period. If the device

is no longer in alarm during the confirmation period, the verification cycle is consid-

ered complete and detection of a subsequent alarm from that device results in the

verification cycle restarting. If the device still reports in the alarm state during this

confirmation period, the alarm condition is reported to the control panel and the

system annunciates the alarm condition.

See the figure below for a graphic illustration of Alarm Verification.

For devices connected to the DLC, the Detector Restart period is 0 seconds.

A – Smoke detector goes into alarm.

AB – RETARD-RESET PERIOD (Control Unit) – Control unit senses detector in alarm and retards (delays) alarm signal, usually by de-

energizing power to the detector. Length of time vaires with design. (11-55 seconds)

BC– RESTART PERIOD (Detector Power-up Time) – Power to the detector is reapplied and time is allowed for detector to become

operational for alarm. Time varies with detector design.

AC– RETARD-RESET-RESTART PERIOD – No alarm obtained from control unit. Maximum permissible time is 60 seconds.

CD– CONFIRMATION PERIOD – Detector is operational for alarm at point C. If detector is still in alarm at point C, control unit will

alarm. If detector is not in alarm, system returns to standby. If the detector re-alarms at any time during the confirmation period

the control unit will alarm.

DE– OPTIONAL REGION – Either an alarm can occur at control unit or restart of the alarm verification cycle can occur.

AD– ALARM VERIFICATION PERIOD – Consists of the retard-reset-restart and confirmation periods.

ALARM VERIFICATION TIMING DIAGRAM

ALARM VERIFICATION PERIOD

RETARD-RESET-RESTART PERIOD -- MAXIMUM 60 SECONDS*

NO ALARM AT CONTROL UNIT

*For installations in Canada this time must not exceed 30 seconds.

CONFIRMATION PERIOD -- 60 SECONDS

ALARM REQUIRED AT CONTROL UNIT

OPTIONAL

REGION

t=0 Seconds t=n Seconds

CONTROL UNIT

RETARD-RESET PERIOD

DETECTOR RESTART

(POWER-UP) PERIOD

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 71 72

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Siemens FIREFINDER-XLS Manual de inicio rápido Pagina 53

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