ELECTESLA ES-K10 AC/DC Current Transmitter User Manual

1. Product Overview

The ELECTESLA ES-K10 AC/DC Current Transmitter is designed to convert measured current signals into standard current loop signals (e.g., 4-20mA, 0-5V, 0-10V, RS485) for transmission to receiving devices such as computers or display instruments. Utilizing an open-loop direct measurement principle and a refined circuit design, it offers high accuracy, linearity, strong anti-interference capabilities, and long-term stability. The input, output, and power supply are isolated for enhanced reliability.

This device is particularly suitable for intelligent monitoring systems in applications involving generators, motors, low-voltage power distribution cabinets, air conditioners, fans, and street lamps.

2. Specifications

The ES-K10 Current Transmitter features a single-turn perforated core structure, integrating the current transformer and transmitter into one compact design. Key technical parameters are detailed below:

3. Installation and Wiring

3.1 Installation Method

The ES-K10 is designed for easy installation using a 35mm DIN standard rail and screw fixing. Its compact size (106mm length, 60mm height, 24mm width) allows for flexible placement.

3.2 Wiring Diagram

Ensure correct wiring according to the diagram below. The cable to be tested should be passed through the central hole of the transmitter. Terminals 1 and 4 are for auxiliary power supply, and terminal 3 is the positive output. Terminal 2 is for negative power. The power supply should be ±12V or ±24V before connecting.

3.3 Three-Wire Output Advantages

The three-wire output method offers several advantages:

• Not easily affected by parasitic thermocouples, resistance drop, or temperature drift.
• Allows for the use of cheaper, thinner twisted pair wires.
• Minimizes impact from magnetic field coupling due to low interference current.
• Suitable for longer and farther wire lengths compared to voltage telemetry systems.
• Enables switching between different channels with unequal wire lengths without affecting accuracy.
• The 4-20mA output uses 4mA for the zero level, which helps in identifying open circuits or damaged sensors.
• Facilitates easy integration of anti-surge and lightning protection devices.

4. Operation and Testing

The ES-K10 current transmitter establishes a linear relationship between the input current and the output signal. For accurate measurements, consider the number of turns of the coil around the sensor. If the coil has multiple turns, the actual input current is the displayed current multiplied by the number of turns.

4.1 Operational Demonstration

As demonstrated in the video, if the coil has 3 turns, an input current of 10A results in a real input current of 30A, producing an output of 10V. Similarly, a 2A input (6A real) yields 2V output, and a 6A input (18A real) yields 6V output, confirming the linear response.

5. Maintenance

The ES-K10 is designed for high reliability and stability, requiring minimal maintenance. However, to ensure optimal performance and longevity:

• Keep the device clean and free from dust and debris.
• Ensure proper ventilation around the unit to prevent overheating.
• Regularly check wiring connections for tightness and signs of wear or corrosion.
• Avoid exposing the device to extreme temperatures or humidity outside its specified operating range.
• Do not attempt to open or repair the unit yourself; refer to qualified personnel for service.

6. Troubleshooting

The ES-K10 incorporates several comprehensive protection functions to enhance reliability. If you encounter issues, consider the following:

6.1 Protection Functions

• Input Overload Protection: Prevents damage from excessive input current.
• Output Overcurrent Limit Protection: Safeguards the output circuit from drawing too much current.
• Long-term Short-Circuit Protection of Output Current: Ensures durability even in sustained short-circuit conditions.
• Two-Wire Port Transient Induction Lightning and Surge Current TVS Suppression Protection: Protects against transient voltage spikes.
• Overvoltage Limit Protection of Working Power Supply: Shields the power supply from damaging voltage fluctuations.
• Working Power Reverse Connection Protection: Prevents damage if the power supply is connected with incorrect polarity.

6.2 Common Issues and Solutions

• No Output Signal:
  • Verify that the power supply is correctly connected and within the specified voltage range (DC12V, DC24V, AC/DC220V).
  • Check all wiring connections for tightness and correct polarity according to the wiring diagram.
  • Ensure the input current is within the specified measurement range.
  • For 4-20mA output, a 0mA reading often indicates an open circuit in the transmission line or a damaged sensor.
• Inaccurate Readings:
  • Confirm that the coil passes through the sensor hole correctly and is not loose.
  • Ensure the number of coil turns is accounted for in your calculations (real input current = displayed current × turns).
  • Check for external electromagnetic interference that might affect the sensor.
  • Verify the receiving device (multimeter, PLC, etc.) is calibrated and functioning correctly.
• Device Not Powering On:
  • Check the power supply voltage and current.
  • Ensure the power supply is connected to the correct terminals (1 and 4 for auxiliary power).

7. User Tips

• Always double-check your wiring against the provided diagram before applying power to prevent damage.
• When measuring current, ensure the cable passes cleanly through the sensor's hole for accurate readings.
• If using a multi-turn coil, remember to multiply the displayed current by the number of turns to get the true input current for calibration.

8. Support and Documentation

For further detailed information, including comprehensive technical diagrams and advanced troubleshooting, please refer to the official user manual in PDF format. This document can be accessed via the following link: ES-K10 User Manual (PDF).

For technical assistance or inquiries, please contact ELECTESLA Official Store support.