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Signal-10 Operation Principles

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ble value) means unlimited time delay, so the loop never switches from the Fire Prealarm status to the

Fire Alarm status.

The integration time for an alarm loop of the Type 2 is defined in accordance with the requirements

mentioned in the Alarm Integration Time section of this Manual on the page 29.

Table 2 shows the matching between current resistance values and corresponding statuses of alarm

loops of the Type 2.

The wiring diagram for including fire smoke (normally open) and fire heat (normally closed) detectors

into alarm loops of the Type 2 is presented on the page 65.

Heat Two Threshold Alarm Loop (Type 3)

A loop of the Type 3 (Heat Two Threshold) is intended to involve fire heat (normally closed) detectors.

This loop is considered to be in one of the following statuses:

Armed The alarm loop is monitored, its resistance being normal

Disarmed The alarm loop is not monitored

Arming Delay The programmed Arming Delay has not been expired

Fire Prealarm A single detector has actuated within the alarm loop

Fire Alarm At least two detectors brought in the alarm loop have actuated, or

the Alarm Delay has expired after single detector actuation

Short Circuit Failure

The resistance of the loop is less than 2 kΩ

Open Circuit Failure

The resistance of the loop is more than 25 KΩ

Arming Failed An attempt to arm the loop has failed because the loop is broken

An included detector having actuated, the loop switches to the Fire Prealarm status. The loop can

switch from the Fire Prealarm status to the Fire Alarm status if a second detector in the loop has actu-

ated, or a given Alarm Delay has expired. If the Alarm Delay is equal to zero, then the loop switches

from the Fire Prealarm status to the Fire Alarm status immediately. The Alarm Delay value of 255 s

(maximum possible value) is considered as infinite time delay, when switching from the Fire Prealarm

status to the Fire Alarm status can be implemented only after actuation of a second detector within this

alarm loop.

The integration time for an alarm loop of the Type 3 is defined in accordance with the requirements

mentioned in the Alarm Integration Time section of this Manual on the page 29.

Table 2 shows the matching between current resistance values and corresponding statuses of alarm

loops of the Type 3.

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