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DATA LOGGER FUNCTION
– To activate the data logger function the DMG must be equipped with a EXP1030 or EXP1031 memory module.
– To configure the data logger it is necessary to use the PC software DMK-DMG Data logger (code DMKSW10) , that allows to select the variables and
recording modes and to download data in the form of a MS-Access ® database table.
– The data logger allows to store at regular intervals up to 32 variables chosen freely among the multimeter measures.
– For each one of these variables it is possible to store:
1. The instantaneous value that the variable had at the moment of sampling.
2. The average value that the variable had in the sampling period.
3. The maximum value that the variable reached in the sampling period.
4. The minimum value that the variable reached in the sampling period.
– Every record is marked with a time stamp taken from the real-time clock of built in the module. The minimum sampling period (distance between two
records) is of 1 second.
– Considering the amount of memory (8 Mbytes), the number of variables to be stored and the sampling period, the PC software indicates the time that must
elapse before the flash memory is completely filled.
– The recording can be continuous (driven only by regular time intervals) or conditional, driven by the status of one of the internal bit-variables (limits, alarms,
Booleans etc.). In this case it is possible to define which variable controls the starting/stopping of the recording.
– When the memory is full, the user can choose to stop the recording (STOP mode) or to continue overwriting the oldest records (LOOP mode).
– The display page dedicated to the data logger status shows all the fundamental information, like number of measures, available free memory, residual time
before the memory is filled (Note: the last two data are not shown when working in LOOP mode).
– Data recorded by the DMG can be downloaded to the PC disk through a serial interface module.
– For detailed information about the setting of datalogger function see the manual of the DMK-DMG data logger software.
–
Note: The memory module mandatory position is slot 1 of the DMG expansion bus (leftmost).
ENERGY QUALITY ANALYSIS
– The DMG900 must be equipped with EXP10 31 expansion module to enable the energy quality function.
– Refer to the relative menu M18 in the parameters setting chapter for the energy quality parameters configuration.
– This function permits to control that the voltage and the frequency measured by the analyzer (normally those provided by the power supplier) remain within
the minimum energy quality parameters according to EN 50160 standard prescriptions.
– In particular, the DMG900 coupled with the EXP10 31 module allows to control the following phenomenon, each identified by a reference code:
• Small variations of integrated average voltage (VLO – VHI)
• Large variations of integrated average voltage (NLO – NHI)
• Harmonic distortion of voltage, like THD or single harmonic levels (THD – HAR)
• Phase asymmetry (ASY)
• Small variations of frequency (FLO-FHI)
• Large variations of frequency (NLO-NHI)
• Sudden reduction of voltage (DIPS)
• Sudden increase of voltage (SWELLS)
• Brief supply voltage interruptions (INTERRUPTIONS).
• Long supply voltage interruptions (INTERRUPTIONS).
– The maximum limit thresholds allowed for the above-indicated phenomenon are adjustable, by the user, through menu M18. The factory-default values of
these limits are set to values specified by the EN 50160 standard.
– The detection of each event can be disabled by setting the correspondent threshold to OFF.
– For all the above-listed phenomenon, when an abnormality occurs, an event with time stamp is logged and stored in the retentive memory, in chronological
order. Only the latest 100 events remain stored.
– “Slow” phenomenon, i.e. those based on integrated measurements (VHI-VLO- THD-HAR-ASY-FHI-FLO), are counted according to the time percentages
during which they remained out of programmed limits. The percentages can be viewed using the “LAST WEEKLY” energy quality display page; viewing is
intended to be of last week, of any week of last year, of last month (last 4 weeks) or of the entire last year.
– Instead for “sudden” events (dip, swell, interruption), energy quality counters are increased and indicate the number of times this type of abnormality occurs
as of the last clearing date (see commands menu).
– Dips, swells and interruptions are controlled comparing the RMS value of the voltage and are checked every half cycle of the fundamental frequency (e.g.
every 10ms at 50Hz).
MONTHLY ENERGY COUNTERS
– The DMG900 stores the status of Energy counters of the last 12 months.
– For every month the unit displays the 5 total counters (kwh+, kwh-, kvarh+, kvarh-,kVAh) and the difference with respect to the previous month (monthly
energy consumption).
– The storage of the monthly situation takes place at midnight of the first day of each month.
– Through the dedicated monthly energies page it is possible to browse through the months and to switch between absolute count (TOT = value of the counter
at the end of the month) and relative count (CON = consumption in that month).
– The annual table of monthly energy is update cyclically. It is possible to clear it completely through the dedicated command in the command menu.
– If a count is not available (time period not elapsed yet), then some dashes are shown.
