26 Installazione-Uso / Installation-User manual FL-FLR100
FUNCTIONAL VERIFICATION
The functional verification of the device must be performed at the end of the alignment and autocalibration
procedure and, in general, whenever suitable.
In order to perform the alarm detection verification, use the provided alarm/fault filter and place the area “A”
on the optics of the receiver. Then, verify that:
• after an interval of 5 seconds, the alarm condition is detected and notified by turning the red LED
fixed ON and activating the pre-alarm and alarm relays (RELAY1 and RELAY2).
Now, remove the alarm filter and then remove the alarm condition by:
• either turning OFF and then ON the receiver unit
• or issuing a reset command on the fire detection control panel (this method is applicable if the detection
circuit coming from the control panel is connected to the LINE terminals – see dip-switch DS9)
Now, perform the fault detection verification, use the alarm/fault filter and place the area “F” on the optics of
the receiver and verifying that:
• after n seconds (n = fault signalling delay, configurable via dip-switches DS5, DS6), the fault
condition is detected and notified by turning the yellow LED fixed ON and switching the fault relay.
After removing the obscuration of the receiver, restore the normal working mode of the device by
performing one of the following operations:
• wait for n seconds (if the device is configured in memory OFF mode, see dip-switch DS7)
• turn the receiver unit OFF and then ON (if the device is configured in memory ON mode)
• issue a reset command on the fire detection control panel (this method is applicable if the detection
circuit coming from the control panel is connected to the LINE terminals – see dip-switch DS9)
The fault condition on an installation composed of a Tx/Rx unit and a passive reflector is verified by covering
the passive reflector. This way, other than verifying that the device is able to detect the fault, the following
condition is verified as well: the signal arriving to the receiver is reflected exclusively by the passive reflector.
NORMAL OPERATING MODE
When the optical beam smoke detector is working in normal operating mode, the display is OFF and any
signalling is performed exclusively by using the LEDs and the relays. The signalling generated by the unit
depends on the working mode it is configured for (Tx, Rx or Tx/Rx):
• The transmitter unit Tx can only generate fault signalling due to internal malfunctioning of the unit.
The transmitter unit can never generate a pre-alarm or an alarm condition.
• The receiver Rx or transmitter/receiver Tx/Rx unit can signal a pre-alarm or alarm condition, a fault
condition caused by lack of received signal, need for maintenance and fault condition due to an
internal malfunctioning of the unit.
During the normal operating mode of the device, the green LED is fixed ON.
Optical compensation and maintenance procedure
During the normal operating mode, the Rx (or Tx/Rx) unit performs periodically every 15 minutes a
procedure whose purpose is to compensate the reduction of received light intensity due to:
• accumulation of contaminating material (dust, etc.) on the lids of the units
• slight mechanical misalignments between Tx and Rx units (or between Tx/Rx unit and passive
reflector) due to the structure where they are installed.
The compensation is performed by increasing the gain of the received signal amplifier. If the gain reaches a
predefined maximum value, the reduction of the light intensity cannot be further compensated and the
device enters the maintenance state: the fault relay switches and the yellow LED starts blinking. In such a
condition, the lid of the device must be cleaned by the operator without being removed.
Once the cleaning is done, the received signal level should increase and suddenly go beyond the reference
level. In such a condition, an 1 minute verification interval starts. During this interval, both green and yellow
LEDs blink simultaneously. If the signal level goes below the reference level, the device exits the
verification phase and remains in maintenance state. When the verification interval expires, the gain of the
receiver amplifier is automatically reduced in order to bring the received signal level to the reference value
and the device returns in the normal operating mode.
Note that in case of a pending alarm or fault condition the periodic optical compensation procedure is not
performed.
If an Rx or a Tx/Rx unit is turned OFF in normal operating mode (i.e., without any pending alarm condition),
the optical compensation procedure is performed automatically when the unit is turned ON again.
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