Protec 3500 - System Delays; Coincidence Operation; 3500 Response to an Alarm; Automatic Detection Response

N 93-585-83 Issue 2 AB Page 12 of 25 © Protec Fire Detection PLC 2015
11.0 System Delays
Delays may have been programmed into the 3500 at commissioning time to allow a predetermined delay
time from zone activation until the alarm outputs activate.
Delays may be used in order to allow time for the cause of the activation to be investigated by a responsible
person. If the cause of the activation is found to be legitimate the alarm outputs can be manually activated. If
the cause of the activation is found to be false the 3500 can be reset.
The 3500 system set-up chart must be consulted to determine exactly which outputs have been delayed and
how the delay time has been set up.
If the Silence Alarms button is pressed while a delay is running, the alarm outputs will not be activated when
the delay expires.
Delays only apply to automatic detector activations. A manual activation on a zone
(activating a Manual Call Point) overrides all current delays.
12.0 Coincidence Operation
At the time of commissioning, the system may have been programmed to operate in ‘coincidence’ mode.
Coincidence operation is used in order to minimise the effects of false alarms. Coincidence operation can be
used to prevent alarm outputs in certain areas from triggering until two or more zones have been activated.
This allows the initial activation to be investigated before the alarm outputs of the 3500 are activated.
13.0 3500 Response to an Alarm
13.1 Automatic Detection
If an automatic detector (smoke, heat etc) activates on a zone of the 3500 this is known as an
automatic operation. The 3500 responds by;
 Illuminating the ‘General Fire’ indicator
 Flashing the relevant zone fire indicator
 Fast pulsing of the internal buzzer
 Activating alarm outputs as programmed, after any delays have expired.
 Activating the Global Fire contacts.
13.2 Manual Detection
If a Manual Call Point is operated on the zone of a 3500 this is known as manual operation. The
3500 responds by;
 Illuminating the ‘General Fire’ indicator
 Flashing the relevant zone fire indicator
 Fast pulsing of the internal buzzer
 Immediately activating alarm outputs as programmed (any programmed delays are overridden)
 Activating the Global Fire contacts
13.3 Coincidence Activation
Please see section 12.0
13.4 Silencing the Alarms
Pressing Silence Alarms when in access level 2 will silence alarm outputs. A further activation will
re-sound the alarms.