All-in-one Voltage Current Frequency Meter Connection Diagram

Hi, in this article, we are going to see the wiring diagram and connection of All-in-one Voltage Current Frequency Meter. This is a Three Phase Digital Multifunction Meter that measures and displays Voltage, Current, and Frequency. These meters are widely used in various applications, including industrial sectors, electrical testing, and monitoring systems.

Three-Phase Digital Multifunction Meter Displays, Switches, and Terminals

Here, in the below figure 1 we have shown a Voltage Current Frequency Multifunction Meter and also we have described its displays, switches, and terminals.

Display and Switches

• The three Displays Marked with A are used to show the current (amperage) measurements for three different phases. In a three-phase electrical system, each phase current will be displayed in their corresponding displays.
• This display labeled with L1, L2, and L3 shows the status of the three-phase voltages. At the side, the red indication lamps typically light up to indicate the presence of voltage in each phase. This is useful for verifying that all phases are active and functioning correctly. When the corresponding red lamp is lit, it indicates that the respective phase voltage(L1, L2, L3, L1-L2, L1-L3, and L2-L3)
• The display marked with Hz shows the frequency of the electrical signal in Hertz (Hz).
• The red indication lamps marked with K indicate whether the reading shown in the displays is in Kilo format or not. When the 'K' marked red indication lamp is glowing it indicates its corresponding meter reading is shown in Kilo Format.
• The switch near the voltage display can be used to toggle between different phases to show the different phase and line voltages in a single display.
• Other switches available in the meter can be used to program, and change settings on the meter.

Terminals Identifications

Power 230V AC(1 and 2): These terminals are used for supplying power to the meter itself. It should be connected to a 230V AC power source to power the device.

IA-IA*, IB-IB*, IC-IC*(15 to 20): These are the CT terminals where current terminals are to be connected.

UA, UB, UC, UN(11 to 14): These terminals are for measuring the voltage of the three phases and the neutral. So, here the three-phase power supply should be connected that is to be measured.

All-in-one Voltage Current Frequency Meter Connection Diagram

There are two modes or configurations following which we can connect the Meter - Three-Phase Four-Wire Configuration and Three-Phase Three-Wire Configuration.

Three-Phase Four-Wire Configuration

In a three-phase four-wire system, there are three-phase conductors and one neutral conductor. This configuration is commonly used in systems where both single-phase and three-phase loads are present, such as in residential or commercial buildings. The neutral wire allows for the connection of single-phase loads and provides a return path for unbalanced currents.

Here in the above wiring diagram, you can see all the three phases and neutral are connected to the meter for measurement.

Connection Description

1. All three phases and neutral are connected to the UA, UB, UC, and UN Terminals.
2. All the CTs are connected to IA-IA*, IB-IB*, and IC-IC* terminals with respect to their phases.
3. The 230V AC power terminals are connected to the 'R' phase and neutral to get the 230V power supply.
4. S2 terminals of all the CTs are connected to a common earthing.

Three-Phase Three-Wire Configuration

In a three-phase three-wire system, there are only three-phase conductors are connected to the meter for measurement and no neutral conductor is used for measurement. Here, the neutral conductor is only used for providing a 230V power supply to operate the meter. This configuration is commonly used in balanced three-phase systems, such as in industrial environments where only three-phase loads are present.

Connection Description

1. Here, only three-phase conductors are connected to the meter for measurement. As per the model and requirement for this meter, 'R' and 'B' are connected to their respective UA and UC terminals. The 'Y' Phase is connected to the UN terminal and the UB terminal is kept open.
2. Here, only Two CTs used for the 'R' and 'B' phases are connected to their respective IA-IA* and IC-IC* terminals. There is no CT for the 'Y' Phase so IB-IB* terminals are kept open.
3. The 230V AC power terminals are connected to the 'R' phase and neutral to get the 230V power supply.
4. S2 terminals of all the CTs are connected to a common earthing.

Read Also: 

• Analog and Digital Frequency Meter Connection Diagrams
• Three(3) Phase Digital Panel kWh Meter Connection Diagram
• Ammeter Connection Diagram with Selector Switch and CT
• Voltmeter and Selector Switch Connection for Three (3) Phase Supply
• Digital Voltmeter Wiring Diagram and Connection Procedure
• Digital Ammeter Wiring Diagram and Connection with CT

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