Function
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ASD 531, Technical description, T 140 416 en
2.2.16
Reset types
All events triggered on the ASD 531 go into self-holding mode whenever the default configurations are used. To reset, carry
out a state reset.
The following reset types are possible (see Sec. 2.2.16.1 to 2.2.16.3).
2.2.16.1 State reset
A state reset is triggered by pressing the “
Reset
” key on the control unit or by actuating the “Reset external” input (see also
Sec. 6.6.2). The state reset can be triggered only after an event, and only if the criterion that resulted in the event trigger is
back in the normal state (e.g. smoke level in the smoke sensor is again below the trigger threshold or a fault event is rectified).
As a result of the state reset, the ASD 531 continues to run “normally” and the fan does not stop.
2.2.16.2 Hardware reset
A hardware reset is triggered if there is a brief interruption in the supply voltage or if the “HW reset” key is briefly pressed on
the AMB 31 (see also
). This restarts the ASD 531. The fan stops and then slowly starts up again (start-up
control). The previously programmed parameters of the ASD 531 are retained (system-specific configurations).
Notice
Attention: fire incident control, remote alerting!
A hardware reset briefly triggers the fault relay (approx. 1 s). Before maintenance work is carried out on the
ASD 531, it is therefore essential to switch off the fire incident controls and remote alerting on superordinate sys-
tems (FACP).
2.2.16.3 Initial reset
An initial reset is triggered according to the information in Sec. 7.3.5.
An initial reset determines the basic data (e.g. connected sampling pipe, airflow data), which is then saved on the ASD 531.
The airflow monitoring is also automatically adjusted. The basic data remains stored until such time as another initial reset is
carried out. An initial reset does not discard the previously defined installation-specific parameters (system limits, response
grade).
Danger
•
During commissioning as well as after changes to the sampling pipe (length, repairs) or after changing the fan
speed, it is
imperative
that an initial reset is carried out. An initial reset must also be carried out after repair
work on the ASD 531 (replacement of air flow sensor, aspirating fan unit, AMB 31 main board).
•
After an FW upgrade, an initial reset is required only if expressly mentioned in the relevant firmware descrip-
tion.
•
When carrying out an initial reset, make sure the sampling pipe has been correctly implemented (sealed con-
necting points, sampling holes correctly drilled).
•
If an initial reset has to be repeated because a triggered fault in the airflow monitoring cannot be reset, it
should only be carried out if
all
the necessary measures for cleaning the sampling pipe have been imple-
mented beforehand (including filter-box/filter unit, see also Sec. 9.3). If an initial reset is carried out with
blocked or dirty sampling holes, there is the danger that insufficient or no air samples will be taken and hence
the ASD 531 will no longer be able to trigger an alarm.
•
Before carrying out an initial reset, allow the fan to run for a minimum of 2 min (after switching on or after mak-
ing changes to the sampling pipe).
