NOVAR 2100/2200 Operating Manual
The PFC control and PFC output parameters are set to the default according the tables. The PFC
alarm parameters are set to default values according appropriate table above.
The installation parameters remain unchanged.
To do the factory setting, firstly switch to display parameters with the
key. Then press the
again, keep it pressed and simultaneously press and keep the
, then press and keep the key ▼
too (the order must be kept). Hold the three keys down (for about 6 seconds) until display switches to
measurement values – then you can release the buttons.
Since parameter 20 is set to
Auto
and output powers not defined now, the AOR process is launched,
obviously.
4.5 Method of Measurement
The measurement consists of three processes being performed continuously and simultaneously:
frequency measuring, sampling of voltage and current signals and evaluation of the quantities from
the sampled signals.
4.5.1 Voltage Fundamental Frequency Measurement
Method
The voltage fundamental frequency is measured continuously and evaluated every 10 seconds. The
voltage signal is led through a low-pass filter and then processed.
The fundamental frequency output is the ratio of the number of integral mains cycles counted during
the 10 second time clock interval, divided by the cumulative duration of the integer cycles.
If value of frequency is out of measuring range, such state is indicated with flashing symbol
Hz
.
4.5.2 Voltage and Current Measurement Method
Both voltage and current signal is evaluated continuously as required by IEC 61000-4-30, ed. 2
standard. The unitary evaluation interval,
a measurement cycle
, is a ten / twelve ( value behind slash
is valid for f
NOM
= 60 Hz )
mains cycles
long period ( i.e. 200 ms at frequency equal to preset f
NOM
),
which is used as a base for all other calculations.
The sampling of voltage and current signals is executed together with the frequency of 128 / 96
samples per mains cycle. The sampling rate is adjusted according to the frequency measured on the
voltage input.
If the measured frequency is in measurable range, then the value is used for
subsequent signal sampling.
If the measured frequency is out of this range, the preset frequency
value ( f
NOM
) is used and measured values may be incorrect.
When exceeding the measuring range of voltage or current, overloaded quantity value flashes.
Effective values of voltage and current are calculated from sampled signals over the measurement
cycle using formulas :
Phase voltage (effective value) :
U
1
=
√
1
n
∑
i
=
1
n
U
1
i
2
Line voltage (effective value) :
U
12
=
√
1
n
∑
i
=
1
n
(
U
1
i
−
U
2
i
)
2
Current (effective value) :
I
1
=
√
1
n
∑
i
=
1
n
I
1
i
2
where : i …........ sample index
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