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AMA electrical parameter acquisition instrument

I. Overview

This instrument is connected with electrical parameter sensors for collecting voltage, current and power factor of DC, single-phase and three-phase electricity. It is connected with electrical parameter sensor by 4-20mA, and has RS485 data communication interface.

Technical Specifications

1.Selectable value of voltage range (v): 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 400, 450, 500, 600, 700 , 800, 1000 (can be customized according to user requirements);

2. Selectable value of current range (A): 5, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 150, 200, 250, 300, 400, 500, 600, 700, 800 , 900, 1000 (can be customized according to user requirements);

3. Power factor: 0--1,1-0

4. Collection accuracy: 0.5%

5. Sampling cycle: 0.1s

6. Ambient temperature: -10 ~ 40 ℃

7. Working voltage: AC220V ± 20% 50Hz

8. Power consumption: 10w

The voltage range and current range are determined according to the selected sensor.

Parameter setting

The system needs to set the following parameters:
DC voltage range (F1) DC current range (F2)
Single-phase AC voltage range (F3) Single-phase AC current range (F4)
Three-phase AC voltage range (F5) Three-phase AC current range (F6)

1. Parameter setting method: press the "SET" key, the power window displays "F1-F6", which means entering the parameter selection state, and use the "up" and "down" keys to change the value.
2. Parameter storage
After "F6" is displayed, press the "SET" key again to display "----", indicating that the parameters just set have been stored. Not lost during power failure.

Fourth, the front panel diagram

When the instrument is powered on, the window displays the voltage range value, current range value, communication address, and the factory serial number of the instrument.
In the test state, when the window displays "Err", it indicates that the corresponding sensor signal line is broken; when the window displays "E", it indicates that the corresponding sensor signal value is out of range.

Five, the selection of sensors

1. Electrical parameter sensor output interface: 4-20mA
2. Single-phase power factor sensor without direction discrimination (power factor range: 0 ~ 1).
3. Three-phase power factor sensor with direction discrimination (power factor range: 0 ~ 1, -1 ~ 0).

Six, sensor signal terminal connection

The terminals on the rear panel are signal input terminals, which are connected as follows:

Seven, sensor connection diagram

When collecting "three-phase" electrical parameters, the input terminal of the voltage sensor is connected to Uab; the input terminal of the current sensor is connected to Ic; the input terminal of the power factor sensor is connected to Uab, Ic. Transformer can be used to expand the current range. The connection method of the transformer is the same as that of the single-phase wiring diagram.

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