5.Main functionalities and measurements
5.1.Measurements
Measurements in the system are given by connected devices and the SCU100 control unit itself.
The principle of measurement for AC of the SCU100 control unit includes measurement on the mains and
branches. On the mains side, all values are measured directly. On the branches, current is measured by
the sensors while voltage, power factor as well as active power and energy are calculated using measured
mains values.
For further information, please refer to the following table.
Mains Branches/Sensors
Measurement of
I
MAINS
(Current) [A] I
TRMS
, I
AC
, I
DC
(Current TRMS, AC, DC) [A]
Measured mains values used for calculation
U
MAINS
(Voltage) [V] U
MAINS
(Voltage) [V]
PF (Power Factor)
PF (Power Factor) (manual configuration is
possible)
Calculation of
Power:
– active [W]
– apparent [VA]
– reactive [var]
P
SENS
(Active power) [W]
P
SENS
= U
MAINS
· I
AC
· PF
Energy [kWh] Energy
SENS
[kWh]
With respect to I/O modules, collected and calculated data is reported in the following table.
I/O Modules
Data received Calculation of
Channel contacts status
Change of channel contacts status
Number of changes of contacts status (counter)
Pulses
Summed quantities from meters pulse output
SCU100 INSITE PRO M COMPACT USER MANUAL 19
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