MI001458-E
ENGLISH - 3/16
Measurement and retransmission range
V range, (therefore
), then if Vrms measured is 10V, analog output will
MIN=10, MAX=300
be 4mA, while if Vrms=300V output will be 20mA. In the intermediate points the behaviour
is linear. The retransmission values saturate at approximately 11 V for voltage output and
at 22mA for current output (analog output clamped at 110 %).
If network frequency oscillates more than 30 mHz from rated values (50 o 60 Hz), it’s
possibile to compensate errors on measurements of Power and Energy caused by these
variations. This option is selectable via MODBUS register. Vrms and Irms measurements
are not influenced by these variations.
When the module is switched on, the appropriate setting coefficients are measured
(depending on the choice of 50 or 60 Hz frequency). All the settings made will be
automatically loaded when the module is reset.
Total three-phase active energy
E
E +E +E
A
B
C
Active Energy (phase)
E E E
A
B
C
Frequency
Hz
Total three-phase cos
cos _3PH
P/S
Total three phase apparent power
S
S +S +S
A
B
C
cos (phase)
cos
cos
A
B
cos
C
P
/S
A,B,C
A,B,C
Apparent power (phase)
S S S
A
B
C
V
*I
A,B,C
A,B,C
Total three phase reactive power
Q
Q +Q +Q
A
B
C
Reactive power (phase)
Q Q Q
A
B
C
Total three phase active power
P
P +P +P
A
B
C
Mean three phase current
I
(I +I +I )/3
A
B
C
Active power (phase)
P P P
A
B
C
Root-mean squared current
I I I
A
B
C
Mean three phase voltage
V
(V +V +V )/3
A
B
C
Root-mean squared voltage
V V V
A
B
C
Electrical
Quantity
Symbols
used
Measured
Values
Calculated
Values
Equation
used
Electrical Measurements
(S
) -(P
)
A,B,C
A,B,C
2
2
Electrical
Quantity
Measurement
Range
Selectable retransmission
Range
Vrms
Irms
Active Power
Reactive Power
Apparent Power
Frequency
Active Energy
0..600 Vac
0..I
of TA
PRIMARY
(0..IPRIMARY TA * 600)VAR
(0..I
TA * 600)W
PRIMARY
0..1
(0..I
TA * 600)VA
PRIMARY
40..70 Hz
0..10 V, 0..5 V, 0..20 mA o 4..20 mA
0..10 V, 0..5 V, 0..20 mA o 4..20 mA
0..10 V, 0..5 V, 0..20 mA o 4..20 mA
5..10 V, 2,5..5 V, 10..20 mA o 12..20 mA
