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4
User interface
Operation of the Control Unit Module consists in continuous execution of a control loop that comprises
readouts of signals from gas detectors and scanning of the detectors to check their operation soundness.
Depending on the scanning results the following statuses of the system can be distinguished:
OPERATION
WARNING
ALARM
FAILURE
4.1
Operation
This is the basic mode of operation when everything is fine. This status is identified on the basis of only
green lamps being on (OPERATION, SUPPLY, R4).
4.2
Warning
This condition occurs when a small gas leak is detected that requires user notification in order to take
appropriate control measures. Control Unit Module Alpa MOD LED1 distinguishes between two warning
thresholds:
4.2.1
Warning I
This status is indicated by:
red ALARM light blinking ,
in this status an intermittent beep will be emitted, which can be blocked by pressing and holding
for a few seconds the CONFIRM button,
the OC WARNING signal is enabled, to control the external optical signaller,
R1 (WARNING1) relay is activated and the green control indicator 1 goes on.
4.2.2
Warning II
This status is indicated by:
red ALARM light starts blinking with a higher frequency,
continuous warning sound is horned, this sound signal can be switched off by depressing and
holding the CONFIRM button for few seconds,
OC WARNING signal is activated to control an external optical signaller,
2 (WARNING2) relay is activated and the green control indicator 2 goes on (1 is still on).
4.3
Alarm
It appears when concentration detected by one of the detectors has exceeded the threshold value of
ALARM. It is accompanied by continuous red light of the controls ALARM. In this status:
an acoustic continuous signal is generated – just like in the warning by means of a built-in horn,
The ALARM status does not allow to turn of the horn.
s. 6|13
User Manual: POD-015-ENG R02
