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PDF ATT7030A Data sheet ( Hoja de datos )
| Número de pieza | ATT7030A | |
| Descripción | Application Note | |
| Fabricantes | hitrendtech | |
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ATT7030A Application Note（260-CS-105）
ATT7030A
Application Note
http://www.hitrendtech.com
版权归钜泉光电科技（上海）有限公司所有
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ATT7030A Application Note（260-CS-105）
In the above diagram, VP and VN are connected to phase line and neutral line, the relevant
parameter correspond to 220V voltage. In diagram 3, the CT’s transformation ratio is 1:1.
CT achieves ATT7030A’s sampling input current. There have nether connection method.
Diagram 4 current sampling differences input
Diagram 5 current sampling single-port input
In diagram 4 and diagram 5, IA1 and IA2 is CT’s secondary signal.
We should notice some points when design sampling input signal:
1. Whatever input method, the direct current bias voltage of input pin VxP and VxN should be 2.4V.
The bias voltage must be provided by pin REFOUT (pin 11), or else the measurement precision
couldn’t be assured.
2. For assuring measurement precision, the capacitance filter (10uF and 0.1uF) connected to pin 5
should be closer to the best to pin 5, furthermore any one can not be left out. The grounding point of
capacitance and ground of sampling signal must be shorted.
3. In VxP and VxN input circuitry, 1.2K resistance and 0.01uF capacitance make up of antialiasing
filter, whose structure and parameter should be symmetrical. For attaining favorable temperature
characteristic, we should adopt well component in temperature capability.
4. In sampling input circuitry, capacitance C3 (3300pF) is used to regulate phase error, whose
magnitude should be decided by actual phase error.
5. Default start-up current value is 0.1mV (0.1%Ib).
6. In 3 phase 4 wire mode, voltage-depreciation threshold voltage is 75mV (15%Vn); in 3 phase 3
wire mode, voltage-depreciation threshold voltage is 300mV (60%Vn).
7. When any one phase current is reversed to voltage, the pin 40 (REVP) would output high level.
Base on this we can judge the correctness of connection.
8. SEL pin connected to high level denotes 3 phase 4 wire connection method; low level denotes 3
phase 3 wire connection method.
9. The 3-phase 3-wire meter adopts two-component measurement method. In this condition SEL is
selected to low level, VB substitutes VN in connection interface. The voltage sampling input
V4P/V4N and current sampling input V3P/V3N can become unaided signal input.
10. When 3-phase energy addition mode selects algebraic addition, NEGP can output direction
indication basing on the sign of 3-phse power algebraic additions. Using this function, we can make
stop-reverse 3-phase energy meter convenient.
Energy pulse output circuitry
http://www.hitrendtech.com
版权归钜泉光电科技（上海）有限公司所有
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ATT7030A Application Note（260-CS-105）
① The connect line of neutral line and voltage-hypersensitive resistance should be as thick as
possible to absorb disturbance.
② In resistance network divided-voltage circuitry, the connect line’s breadth of neutral line and
internal circuitry should exceed 1mm.
3. Ground connection is very important to electromagnetism compatibility. Notice the connect points of
power supply ground and signal ground.
The power supply
input of manostat
module and GND
should be
connected at one
point,so that
disturbance in
power supply can
not arrive at
whole system.
4. In PCB layout, the digital ground and analog ground should be connected to great area ground
handy to reduce resistance, inductance and distributing capacitance in ground.
4. In PCB layout, the digital ground and analog ground should be connected to great area ground
handy to reduce resistance, inductance and distributing capacitance in ground.
http://www.hitrendtech.com
版权归钜泉光电科技（上海）有限公司所有
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