MSA SUPREMA Touch, Инструкция по установке и обслуживанию, Страница: 20 / 309

MSA AUER
MSA
Operation of the System
SUPREMATouch 19 US
LED Indicators and Alarms
The 8 LED indicators provide system and signal status information.
SYSTEM:
SIGNAL:
Alarms can be latching or non-latching [also see Measure Points].
Non-latching alarms:
When a signal exceeds the alarm threshold a new alarm is triggered and the corresponding LED
flashes at a frequency of 0.5 Hz. Pressing the ACKNL [acknowledge] key makes the LED change
to ‘steady state’. When the signal is below the alarm threshold, the LED will turn off, regardless of
whether the alarm has been acknowledged or not. For non-latching alarms, the RESET key has
no effect.
Latching alarms:
When a signal exceeds the alarm threshold a new alarm is triggered and the corresponding LED
flashes at a frequency of 0.5 Hz. Pressing the ACKNL [acknowledge] key makes the LED change
to ‘steady state’. When the signal is no longer exceeding the alarm threshold, the LED remains
in ‘steady state’ if the alarm has been acknowledged, or in the ‘flashing state’ if the alarm has not
been acknowledged. If the signal is no longer exceeding the alarm threshold and the alarm has
been acknowledged, the LED is extinguished by pressing the RESET key. If the signal still ex-
ceeds the alarm threshold, pressing RESET has no effect.
Signals that are above full-scale range or signal failures that were caused by an interruption of the
digital communication are always latched. Signals below the measurement range are non-latch-
ing. Measurement values that are over the full-scale range will trigger all 4 alarms.
If an audible alarm device is connected to the horn relay, it will sound as soon as a new alarm is
triggered. It continues to sound even when the alarm condition no longer exists. Pressing the
ACKNL key silences the horn, regardless of whether or not the alarm condition still exists.
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POWER [green] power supply on/off
-
FAIL [yellow] system specific error [e.g. defective CPU]
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INHIBIT [yellow]
on: inputs are inhibited or a calibration is pending
blinking: outputs connected to one or more inputs are locked
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AL 1–AL 4 [red] input signal alarms
[each input can have up to four alarms]
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FAIL [yellow] specific input signal statuses
[measurement values that are over full-scale, below the measure-
ment range and signal failures]
When a redundant system is used, the RESET or ACKNL key has to be pressed for at
least 1 second.