MI00150-10-EN INSTALLATION MANUAL
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Alarms on frequency or totalizer measurement (optional board):
Two alarms can be activated on the measurement of the frequency of the digital input signal or on the totalizer threshold
values, each of which, if enabled, can be congured as follows:
1. Alarm on the minimum threshold.
2. Alarm on the maximum threshold.
3. Alarm on the minimum held threshold (does not automatically reset).
4. Alarm on the maximum held threshold (does not automatically reset).
5. Alarm on the totalizer threshold value (does not reset automatically).
For each alarm it is possible to set threshold and hysteresis. For the totalizer alarm, the hysteresis is not considered. If the
alarm is maximum the reset value is Threshold-Hysteresis, if it is minimum the reset value is Threshold + Hysteresis. The
status of the alarms can be viewed via the two LEDs on the front panel and from the relays (if the optional board is used).
The relays switch status when the alarm occurs and return to the initial state when it is reset (if held). The alarms held are
reset in normal operation by pressing the UP + OK/MENU keys for a few seconds. For the totalizer alarm, the alarms are
reset by pressing the UP+DOWN+ OK/MENU keys, via MODBUS or from the auxiliary digital input.
Totalizer
As an alternative to measuring the frequency of the digital input signal, it is possible to view the value of the associated
totalizer (saved in non-volatile memory). Both values are available simultaneously in the 11-digit indicators (4+7).
The totalizer can be:
Increasing: it is increased by one unit at each rising edge of the digital input.
- Decreasing: it is decreased by one unit at each rising edge of the digital input.
Once the maximum or minimum limit is reached, counting restarts from zero.
It is also possible to set a reduction ratio by which to divide the totalizer value; the resulting value will then be displayed.
Reset can also take place in the following three ways:
- From auxiliary digital input (if enabled).
- By pressing the three keys simultaneously (if enabled).
- Via Modbus register.
Display of frequency measurement value or totalized value
Three types of operation can be set (except for the 11-digit models that display both the frequency value and the totalizer
value together) that dene the display modes:
1. Type 0: both frequency value and totalizer value display. Pressing UP for a few seconds you access the frequency
display, pressing DOWN for a few seconds displays the totalized value. When passing to the frequency value for a few
seconds the writing appears, passing to the totalized value the writing appears for a few seconds.
2. Type 1: frequency measurement display only.
3. Type 2: totalizer display only
Average and frequency measurement ltering
The frequency value can be averaged over a settable number of samples. The average value is then ltered through the
20-level exponential lter and then shown on the display.
VLF Mode
If the full scale in Hz for measuring the frequency (HI-F) ≤ 1 Hz the instrument goes to Very Low Frequency Mode (VLF)
thanks to which the minimum detectable frequency value is equal to 0.00015 Hz (1 pulse every 111 minutes).
Password to access the menu
It is possible to enable password protection from the Programming Menu. The Quick Alarm Menu is always free of
passwords.
