Alstom iSTAT M355, Manual, Page: 55 / 154

User Manual M3x5/EN M/B
iSTAT M3x5
Page 53
WARNING
Before modification, all energy counters should be read or if energy values are stored in
recorders, recorder should be read with
QDSP2 software or stored on Memory card to
ensure data consistency for the old data.
After modification of the energy parameters, the energy meters (counters) should be reset.
All recorded measurements from this point back might have incorrect values so they should
not be transferred to any system for data acquisition and analysis. Data read before any
modification should be used for this purpose.
10.9.1 Active Tariff (KD)
When active tariff is set, one of the tariffs is defined as active, switching between tariffs is
done with a tariff clock or a tariff input. For the operation of the tariff clock other parameters
of the tariff clock that are accessible only via the communications must be set correctly.
10.9.2 Common Energy Counter Resolution (KD)
The Common Energy Counter Resolution defines the minimum energy value that can be
displayed on the energy counter. On the basis of this and a counter divider, a basic
calculation factor for energy is defined (-3 is 10
-3
Wh=mWh, 4 is 10
4
Wh = 10 kWh). The
Common energy counter resolution also affects the setting of pulse outputs and alarm
outputs when the instrument is being used as an energy meter.
The Table below defines recommended values for the Common Energy counter resolution,
where the Individual Counter Resolution is at its default value of 10.
Current
Voltage
1 A 5 A 50 A 100 A 1000 A
110 V 100 mWh 1 Wh 10 Wh 10 Wh 100 Wh
230 V
1 Wh 1 Wh 10 Wh 100 Wh 1 kWh
1000 V
1 Wh 10 Wh 100 Wh 1 kWh 10 kWh
30 kV
100 Wh 100 Wh 1 kWh 10 kWh 10 kWh *
* - Individual Counter Resolution should be at least 100
10.9.3 Common energy cost exponent
Defines the number of decimal places used for the energy cost calculation and storage. The
cost exponent is used for recording the cost without decimal places.
10.9.4 Common Tarif Price Exponent and Energy Price in Tariffs
The exponent and price represent the energy price (active, reactive, common) in a tariff.
The price exponent is used for recording the price without decimal places.
For example, to set a price for tariff 1 to 0.1567 €/kWh, the number in Price for energy in
tariff 1 field should be 1567 and Common tariff price exponent should be -4 (1567 x 1E-4 =
0.1567)
10.9.5 Measured Energy
For each of the eight (8) counters different measured quantities can be selected. User can
select from a range of predefined options referring to measured total energy or energy on
single phase. Or the user can select their own option by selecting appropriate quantity,
quadrant, absolute or inverse function.
The Energy counters can operate in all four quadrants; this is chosen using a graphical
interface as shown in Figure 10.8.