14
E
N
G
L
IS
H
programmed value.
Example 1: the transducer is a three-phase model for unbalanced loads
and requires a rated input of a 100/š 3V phase-neutral voltage and 5A
current (AV3.3 model). The mains is 20,000V phase-phase voltage and
the maximum current for each phase is 500A. Therefore, the relevant
parameters become:
in.C
→
P-S = 100;
in.V
→
d.P = 111 (no decimal point)
→
P-S = 200.
The analogue output “OUTPUT 1” is a 4-20 mA (Lo.A = 20.0%, Hi.A =
99.9%) and the selected retransmitted measure is "r1" (system's active
power). The automatic calculation of the full scale made by the transducer
is 20,000 / š
3
x 500 x 3 = 17.3MW (VÐ / š3 x I max. x N° of phases).
Prior to the setting of "Lo.E", the display will show the segment close to
"M" (mega), which will be blinking, followed by 00.0. The same segment
will appear for "Hi.E" followed by 17.3 (full scale value). The analogue
output value will be 4mA when the power is equal to 0 and 20mA when
the power is 17.3 MW.
Example 2: The mains is 10kV phase-phase voltage. With the same
procedure described in example 1, select the "r7" measurement (average
phase-phase voltage). The "Lo.A" value will be set at 80.0 (80% of the
output full scale = 16mA) and the "Hi.A" value at 20.0 (20% of the full scale
= 4mA) . Prior to "Lo.E" and "Hi.E", the display shows the "–" on the right
(indicating K) that will be flashing and the "00.0 and 10.0" values
respectively will be set. In this case the value of the analogue output will
be 4mA with a 10kV input, and 16mA with an input voltage equal to 0
(scale inversion).
Note: retransmission of the measured system's power factor (cos
ϕ)
. If
the "r5" measurement is selected, the electrical parameters "Lo.E" and
"Hi.E" display the type of power factor displacement which has been set
("C" capacitive or "L" inductive) followed by the decimal point and by the
first two decimal numbers of the power factor.
Example: C.21 stands for a capacitive power factor the value of which is
0.21 and L.73 stands for an inductive power factor the value of which is
0.73. The only exception is the unit power factor which will be displayed
as "1.00".
A.o1
: selection menu of the additional analogue output (if available).
The programming steps are the same as those relating to output 0 "Ao.0".
S.ou
: selection menu of the serial communication output (if available).
The transducer is provided with a serial interface (on request) that allows
the communication with a PC or a PLC. It is possible to retransmit both
the static and the dynamic variables and to make connections with more
than one transducer (multidrop).