© 2006 Carlo Gavazzi Industri A/S. All rights reserved
51
G 3800 X036 Operation Manual
August 2006
The above illustration shows the normal sequence and reset of an alarm in the operation mode “Standard”:
t1:
When all contacts are in off-position, the Mastergenerator alerts the alarm system automatically upon
loading of the application.
t2:
After elapse of on delay Ton, the Mastergenerator activates the alarm siren and causes the output of the
source channel to flash.
t3: By activation of the acknowledgement button, the Mastergenerator switches the alarm siren off
(provided that the siren time has not elapsed) and transfers the alarm source indication into a continuous
signal.
t4: By activation of the reset button, the alarm source indication turns off and the system is alert again.
Operation mode “Auto reset”
The above illustration shows the normal sequence and reset of an alarm in the operation mode “Auto reset”:
t1: When all contacts are in off-position, the Mastergenerator alerts the alarm system automatically upon
loading of the application.
If a contact is subsequently activated, initially nothing will happen because of entered on delay Ton.
t2: After elapse of on delay Ton, the Mastergenerator activates the alarm siren and causes the output of the
source channel to flash.
t3: After elapse of the siren time TA and reset of the alarm contact, the Mastergenerator switches the alarm
siren off.
t4: Acknowledgement deactivates the Normally open output, and the system at once brings itself in the alert
state again.
t5/t6: As t1/t2.
t7: In spite of the acknowledgement of the alarm, the flashing source indication changes to continuous
operation, because the alarm source is still activated at this point of time. Since the siren time has not yet
elapsed, the alarm siren turns off.
t8: Only when the alarm source switches off, is the source indication also reset and the alarm system in the
alert state again.
Passive detector (IN)
Passive detector (OUT)
Acknowledgement
Alarm siren
Ta
TOn
