7M User’s Manual 13
3.2.1 Cap touch self calibration process
In a reported xed 64s interval the average, minimum and maximum value of the cap touch sensor is calculated. If the
conditions are stable (without interruptions) then the average value of the cap touch sensor is used as a reference value.
If the new reference value deviates suciently from the permanently stored value, it is permanently saved. Permanently
stored value is used when the power is turned on.
At the rst switch on the cap button could take 60 s before start to work.
3.2.2 Energy counters
There are two sets of energy registers – four non-resettable registers which can be assigned for active energy (MID approved),
reactive energy (national approval) or apparent energy (no approval). The meter with MID approval should have at least one
register with active energy measurement. There are additional 8 energy registers which can be parameterised by the user
regarding type of energy, active quadrants, direction of counting and tari and they can also be resetted using MODBUS
command or cap touch.
Indication of four non-resettable registers on the LCD is driven directly from the measuring part of SW.
On the LCD each energy counter is displayed with two screens. On the rst screen, there is the counter designation and
an additional code. For the code the user can choose between the OBIS code or letter description code. On the second
screen there is the 7-digit numerical number which shows the value of the energy, the unit, lock sign for the xed legally
relevant non-resettable counters, energy direction sign and the sign of currently active register. The decimal dot is xed
and resolution is xed to 100 Wh. The rst screen is displayed for three seconds and the second screen for the pre-set cyclic
period. In case of manual scroll with cap touch, no additional touch is needed to switch between these two screens.
Legally relevant non-resettable registers are designated with letters E1 to E4, while legally non-relevant resettable registers
are designated with C1 to C8. The code is specied in the Table 1.
Table 1 (next page) contains descriptions and measured quantities as well as a list of possible measurements that can be set
by the customer.
LEGEND:
1° letter: 2° letter: 0 = all taris
A = Active energy I = Imported 1 = tari 1…
r = Reactive Energy E = Exported 4 = tari 4
S = Apparent Energy A = Absolute
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