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Hysteresis threshold set for the minimum and maximum flow rate alarms. The value of this parameter is expressed as
percentage of the full scale value and may be set from 0 to 25%.
The output current signal can be specified by the user in case of failure of either, empty pipe, coils interrupted, or ADC
error. The signal current is set as a percentage (0 to 125%) of the 0/4-20mA current. 125% corresponds to 24mA and
does not depend on the selected range (0-20/4-20mA).
The NAMUR NE43 recommendation asks for a alarms signalling value for the current output lower than 3.6mA (<18%)
or bigger than 21mA (>105%). It would then be preferable to set the value of this function at the 10%, so that the current
value in case of the a.m. cases would be 2 mA, allowing the following diagnostics:
current < 2mA - 5%: line interrupted, power supply failure or faulty converter;
2mA -5% * current * 2mA + 5%: hardware alarm;
4mA * current * 20mA: normal working range;
20mA < current * 22mA: out of range, measure above 100% f.s.
This function is active with POS. 7.1 see page 35
POS. 7.2 see page 35 enable to ( FREQ.+, FREQ.-, FREQ.±)
To set the frequency value assigned to the on/off output in one or more of the following failure cases:
Empty pipe; Coils interrupted ; ADC error. Allowable range is from 0 to 125% of the frequency full scale value. Although
there are no specific rules regulating cases such as these, it would be convenient to use the failure information as follows:
0% Hz * frequency * 100% f.s.: normal working range;
100% f.s. < frequency * 110% f.s.: overflow, measure above the 100% of the f.s.;
115% f.s. * frequency * 125% f.s.: hardware alarm condition.
MENU 5 - ALARMS
Maximum value alarm set for direct flow rate set (expressed in technical units). When the flow rate value exceeds such a
threshold, then an alarm message is generated. Setting this parameter to zero disables the alarm generation.
Maximum value alarm set for reverse flow rate set (expressed in technical units). When the flow rate value exceeds such
a threshold, then an alarm message is generated. Setting this parameter to zero disables the alarm generation.
Minimum value alarm set for reverse flow rate set (expressed in technical units). When the flow rate value falls below
such a threshold, then an alarm message is generated. Setting this parameter to zero disables the alarm generation.
Minimum value alarm set for reverse flow rate set (expressed in technical units). When the flow rate value falls below
such a threshold, then an alarm message is generated. Setting this parameter to zero disables the alarm generation.
(POS. 5.1) Flow Rate Alarm maX Positive
[Max+=XXXXX]
AL3
[FRAXP]
(POS. 5.2) Flow Rate Alarm maX Negative
[Max-=XXXXX]
AL3
[FRAXN]
(POS. 5.4) Flow Rate Alarm miN Negative
[Min-=XXXXX]
AL3
[FRANN]
(POS. 5.5) Alarm Thresholds HYSteresis
[Hysteresis=% XX]
AL3
[ATHYS]
(POS. 5.6) Output Current Alarm Condition Value
[mA V.alarm =% XXX]
AL3
[OCACV]
(POS. 5.7) Output Frequency Alarm Condition Value
[Hz V.alarm=%XXX]
AL3
[OFACV]
(POS. 5.3) Flow Rate Alarm miN Positive
[Min+=XXXXX]
AL3
[FRANP]
