VT417 / AC current meter 20A
- Vladimir Tayzhev
The sensor is developed and tested. Ready for sale. But this article is currently being written, some of the information in this article may be incorrect.
Physical description
Dimensions
Function
The "VT417 / AC Ampere meter" together with the current transformer allows measuring the alternating current.
By default, the converter is equipped with a current transformer that allows measuring alternating current in the range of 0.01 ... 20A.
Supply of Ampere meter with different parameters (from 0.01 to 100 Amperes) is possible on request. Sensor has a possibility to have 25mA or 50mA as an output.
Inventory / components
The Ampere meter consists of RMS-to-DC converter and a current transformer. They are connected using two wire connection and 2P 5.08mm terminal. The converter is connected to the main monitoring unit using RJ11 6P4C telephone cable.
Package content | Description | |
|---|---|---|
1 |  | VT417 converter Analog sensor Plug and play Includes expression formula. Use the formula in sensor configuration window. |
2 |  | Current transformer Imax = 16A Output = 25mA 1.3mm two wire cables 0.3m 2P 5.08mm Terminal |
3 |  | RJ11 6P4C telephone cable 2m Pinout scheme can be found at: |
4 |  | x1 Sheet metal screw М4.5 16mm |
5 |  | Sticker |
Safety instructions
- Please observe the valid regulations for installation in the country in which current meter is installed and operated, and the national regulations for accident prevention. Please also observe any internal company regulations, such as work, operating and safety regulations.
- The technical specifications and limit values stated must not be exceeded under any circumstances. In particular, this applies to the specified ambient temperature range and IP protection category.
Siting location requirements
To ensure proper functionality, the conditions specified in section “Technical specifications” must be observed.
Installation procedure
Mounting
Mount the converter by:
a) Sticking it to the wall using the sticker
or by
b) Screwing it to the wall
Notes on assembly
- Be careful, transducers max. voltage for isolation is 2kV.
- The transducer can measure AC current on any current wire, not more then 6 mm in diameter. Just open the cover, insert the wire and close.
- Max. distance for AC Ampere meter from monitoring unit is 50 meters.
- Each VT417 sensor has it's own expression formula printed on it's plastic cover. Use it to configure the sensor.
Installation
- Connect VT417 current transformer to "VT417 converter" 2P terminal.
- Insert the power cable inside VT417 current transformer and close it. Max. power cable diameter is 6mm.
- Connect one end of RJ11 6P4C cable to monitoring unit and the other end to RJ11 output of VT417 converter. The converter is powered by the system using RJ11 6P4C cable. The monitoring system will automatically sense current transducer as a sensor.
Configuration
Once connected the analog port of the monitoring system, the system will automatically sense VT417 as a sensor.
The new sensor will appear in the web interface of the system. Click on "System tree" menu and you will find a new sensor marked by an icon 
(abreviation from: Voltage function, used for sensor monitors and converters). Click on the sensor to open it's properties.
A modal window with sensor properties will pop up.
1. Change type of the sensor by choosing "Current". Choosing any type of the sensor does not affect sensor properties, it only changes sensor icon for comfort of usage.
2. Change the name of sensor, for example "AC Ampere meter".
3. Use "Expression formula". Each sensor has it's own expression formula. It is printed on VT417 converter's top cover. Example below:
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In this example the expression formula for the current sensor equals "4 * x"
4. Put in the threshold levels by dragging: Low alarm, Low warning, High warning, High alarm levels.
For example, graph above shows that the state of the sensor at the moment is "Normal" because 20.4 is between "Low warning" and "High warning" states, which is considered "Normal" state.
5. Click “Save” or “Apply” at the bottom of the “Properties” window. The page will reload and the sensor will update by changing it's icon type to 
(abreviation from: "Ampers").
Manipulating VT417 converter
Do not tweak converters variable resistors. They are tweaked by the manufacturer for optimal measurement. Tweaking these may result in incorrect measurement.
Technical specifications
HAT-100Q1 / AC current transducer | |
|---|---|
| Dimensions | Converter: Length 74.3mm, Width 19mm, Height 19.6 mm Current transformer: Length 19.3mm, Width 19.2mm, Height 29.20mm Current transformer two wire cables length 0.3m |
| Weight | 150 g |
| Operating temperature | Temperature : Min. -10° C - Max.80° C |
| Operating humidity | Min. 5% - Max. 95% (Non-Condensing) |
| Output (Converter to RMS) | Connector RJ11 6P4C Maximum Input Current (RMS) = 25mA (50 mA possible by the manufacturer) Output Voltage (DC) = 0...5 V Supply voltage = 9...12 V |
| Input | 2P 5.08 terminal Max. AC current = 0.01...20A |
| Input impedance | 20 Ω |
| Mounting | Wall mount, rack mount |
| Power Consumption | 1 Watt |
| Max. distance m | 50 m |
| HS Code | 9030 33 100 |
Usage examples
Example 1: Using logic to turn on equipment & monitor it's status
Example 2: Switch off equipment before it overloads
Equipment life prediction
Notify personnel if jam occurs
Developer zone link: Transformator RMS-to-DC VT417