Operation
ASD 531, Technical description, T 140 416 en
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8.4
Reset
The ASD 531 can be reset after a triggered event by:
•
Pressing the “
Reset
” pushbutton locally on the ASD or
•
Briefly actuating the “External reset” input on the ASD.
Notice
•
For a local reset, the “
Mode
” rotary switch must be set to
Pos 1
.
•
Resetting can be triggered only after an event, but only if the criterion that resulted in the event trigger is back
in its normal state (e.g. smoke level in the smoke sensor is once again below the trigger threshold, or a fault
event is rectified). As a result of the reset, the ASD 531 continues to run “normally” and the fan does not stop.
•
Local resetting (“
Reset
” key) does not reset a superordinate FACP. It may also happen that the reset in the
ASD 531 triggers a fault in the superordinate line of the FACP.
8.5
Displays
8.5.1
Displays on the control unit
Several LEDs on the control unit indicate the current status of the ASD 531. The following table lists the states for the
ASD 531.
Indicator
Function / state
Operation
Alarm
Fault
Det. dusty
Det. dirty
Green
Red
Yellow
Yellow
System Off (no voltage)
System inactive (Reset external)
On
½ s T
Smoke sensor Off (from FACP)
On
½ s T
Quiescent state
On
Pipe blockage/pipe breakage, delay time running
On
1 s T
Pipe blockage/pipe breakage, fault triggered
On
On
Fan tacho signal missing
On
On
Fault triggered
On
On
Pre-signal 1
On
2 s T
Pre-signal 2
On
1 s T
Pre-signal 3
On
½ s T
Alarm
On
On
Detector dusty
On
1 s T
Detector dirty
On
½ s T
Smoke sensor faulty
On
On
Notice
No fault triggered (triggers only after delay time has expired
“
Fault
” continuously lit).
T
= flashing display; ½ s cycle / 1 s cycle / 2 s cycle
