Operation
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ASD 531, Technical description, T 140 416 en
8.2
Functional sequence of operation
The operation of the ASD 531 aspirating smoke detector in normal mode (after commissioning) is limited to switching on/off or
to resetting a triggered event (alarm/fault). Operation is generally via the FACP, with input of the “Zone On/Off” and “Reset”
functions (on “Reset external” input of the ASD 531).
Events triggered on the ASD 531 can be reset locally using the “
Reset
” key on the control unit or by briefly actuating the “Re-
set External” input. The reset is possible only if the triggered event is no longer pending (e.g. smoke sensor no longer has
smoke). The application of a continuous signal at the “Reset external” input also deactivates (switches off) the ASD 531 (see
also Sec. 2.2.6 and 6.6.2).
Notice
A local reset does not reset a higher-order FACP. It may also happen that the reset in the ASD 531 triggers a
fault in the superordinate line of the FACP.
To aid commissioning the ASD 531, there are three rotary switches and two DIP switches inside the device on the AMB 31
main board.
These elements are used when commissioning the ASD 531. Device settings for pre-defined system limits can be called up.
These pre-defined positions are stored with normative values for response sensitivity, airflow monitoring (
LS-Ü
) and pipe con-
figuration. They also contain positions which allow deviations from the normative limits with regard to airflow monitoring.
8.3
Rotary switch “Mode” switch positions
The switch settings listed below can be called up on the AMB 31.
Pos.
Purpose
Meaning / Procedure
0
Initial reset
See Sec. 7.3.6
1
Operation position
--
2
Isolate device
See Sec. 2.2.12.1 / 7.3.7
3
Test trigger fault
See Sec. 7.7.2
4
Test trigger pre-signal
See Sec. 7.7.2
5
Test trigger alarm
See Sec. 7.7.2
6
Log off optional module
See Sec. 7.3.8
7
Device inactive
See Sec. 7.3.9
8 – 16
Reserve
--
Notice
The table lists only the available switch positions. A detailed description of the operator functions (input pro-
cedure) can be found in the relevant section (“Meaning / Procedure” column).
When the “
Mode
” rotary switch is turned to a new position, it must be confirmed within 5 s with the “
Set/Res
” key. If not, an-
other 5 s delay time occurs (“
Mode
” LED flashes). If no confirmation occurs after this time, the ASD triggers a rotary switch
fault.
