CT-100/CT-150 Series User’s Manual
150) is fed to pin #6 in “C”-option and to pin #6 in the “P”-option. Current return pins
are respectively found on pin #1 and on pin #7 in the “C”- and the “P”-option.
Maximum secondary current is rated at ±100 mA and an external shunt resistor,
which can be placed close to the user’s desired measuring circuit, is needed in order to
convert the current signal to voltage.
The voltage output pins (V
O
and V
O
RET) cannot be found on standard current
output versions.
2.5.3
Voltage Output (“V” versions only)
A buffered output voltage signal is present on the voltage output versions of the
CT-100V/CT-150V Series transducers in order to allow easier connection of the DCCT
to an external circuit or an Analog to Digital converter.
The full-scale output bipolar signal
V
O
(pin #2 for “C”-version, pin #6 for the
“P”) is referred to
V
O
RET
(pin #7 on both “C” and “P” options) and the behavior is as
follows:
•
For CT-100 series:
▪
+10V output if the primary current is +100A;
▪
-10V output if the primary current is -100A;
•
For CT-150 series:
▪
+10V output if the primary current is +150A;
▪
-10V output if the primary current is -150A.
This behavior can be resumed in the gain parameter
G
, in [V/A], expressed as
the ratio between the transducer output voltage
𝑉
𝑉
𝑂
− 𝑉
𝑉
𝑂
𝑅𝐸𝑇
and the primary current
I
P
.
𝐺 =
𝑉
𝑉
𝑂
− 𝑉
𝑉
𝑂
𝑅𝐸𝑇
𝐼
𝑃
This gain value is
G = 0.1 V/A = 100 mV/A
for the CT-100V versions and
G =
1/15 V/A
for the CT-150V versions.
V
O
RET
pin is not internally connected to ground GND (pin #4 on “C” and pin
#1 on “P”) and it should be connected to ground directly using a single-point connection
(e.g. on an external ADC ground pins or V
IN
- pin). The availability of this “return”
signal is very useful in order to avoid additional ground-loops and noise pickup on the
voltage-output version of the transducer.
Please note that the maximum differential voltage between the
V
O
RET
and the
GND
pin has to be kept within ±0.5V.
|𝑉
𝑉
𝑂
𝑅𝐸𝑇
− 𝑉
𝐺𝑁𝐷
| ≤ 0.5 V
Содержание Flucs CT -100
Страница 28: ...DC User s Manual...
