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The Tense EM-07 is a versatile 3-phase multimeter designed for comprehensive monitoring and protection of electrical systems. It provides detailed measurements of voltage, current, apparent power, and frequency across three phases, offering both phase-neutral and phase-phase readings. The device is equipped with an RS485 Modbus RTU interface, enabling seamless integration into larger control and monitoring systems. Its custom-designed glass LCD ensures clear and intuitive display of all measured values and settings.
The EM-07's primary function is to measure and display a wide array of electrical parameters. For voltage, it monitors V1, V2, V3 (phase-neutral) and V12, V23, V31 (phase-phase). For current, it measures I1, I2, I3. It also provides readings for apparent power (S1, S2, S3) and frequency (F1, F2, F3). Beyond instantaneous values, the device tracks minimum, maximum, and average values for voltage, current, and frequency, as well as demand values for current and apparent power. This comprehensive data collection allows for in-depth analysis of system performance and load characteristics.
A key feature of the EM-07 is its robust protection capabilities. It offers adjustable high/low voltage, current, and frequency protection, safeguarding connected equipment from potentially damaging electrical conditions. Users can configure these protection thresholds, along with delay and reset times, to suit specific application requirements. The device also includes voltage and current asymmetry protection, which monitors imbalances across phases and can trigger protective actions if thresholds are exceeded. Furthermore, it incorporates phase sequence protection, which can detect incorrect phase ordering and prevent operation under potentially harmful conditions.
The EM-07 is equipped with a single relay output, which can be configured to activate based on various protection events. This allows the device to directly control external contactors or alarms, providing an immediate response to detected faults. The device also features "Current Fuses Enable/Disable" and "Voltage Fuses Enable/Disable" functions, which provide rapid shutdown in cases of extreme overcurrent or overvoltage, acting as an additional layer of protection. A "Demurrage Protection" feature helps prevent faulty switching caused by motor starting currents, offering adjustable time and factor settings.
For enhanced system management, the EM-07 allows for the deletion of demand records, enabling users to reset demand calculations as needed. The menu system is password-protected, ensuring that critical settings can only be modified by authorized personnel. An "Auto Reset Enable/Disable" function is available for both voltage and current protection, allowing the device to automatically reset after a fault condition clears, or requiring manual intervention.
Operating the EM-07 is designed to be straightforward. Upon energizing, the device defaults to the Home Screen, displaying real-time voltage and current values. Navigation through the various display screens and settings menus is accomplished using a set of intuitive buttons: ESC, SET, UP, and DOWN.
The UP and DOWN buttons are used to scroll through different measurement values on the display, such as minimum, maximum, average, and demand values for voltage, current, apparent power, and frequency. These buttons are also used to navigate through menu parameters and adjust parameter values during configuration. The SET button is used to enter menus, confirm selections, and save changes to parameters. The ESC button serves multiple purposes: it allows users to exit menus, return to the home screen, and, in the event of an error, perform a manual reset.
The device's display provides clear indicators for various states, including relay status (open or closed) and phase sequence (correct or incorrect). Error codes are displayed in the bottom right corner of the screen, accompanied by a flashing backlight, to alert users to specific fault conditions such as high/low voltage, current, or frequency errors, asymmetry errors, or fuse errors.
Configuration of the EM-07 involves entering a password-protected settings menu. Here, users can adjust all protection parameters, including voltage, current, and frequency thresholds, delay times, reset times, and hysteresis values. Settings for voltage and current asymmetry protection, phase sequence protection, and demurrage protection are also accessible. Crucially, the device allows for the configuration of the Current Transformer Ratio and Voltage Transformer Ratio, which are essential for accurate measurements in systems employing external transformers. The RS485 Modbus ID and Baudrate can also be set, facilitating communication with other Modbus devices.
A "Quick Setup" section in the manual highlights commonly used parameters for rapid configuration, simplifying the initial setup process for typical applications. The ability to change the user password and enable/disable password protection adds a layer of security to prevent unauthorized tampering with settings.
Maintenance of the EM-07 is minimal and primarily involves ensuring the device's physical integrity and cleanliness. Users are instructed to de-energize and disconnect the device before cleaning. The body of the device should be cleaned with a dry or damp-dry cloth. It is explicitly stated that conductive or other chemical substances should not be used as cleaning agents, as they can damage the device. After cleaning, the device's connections should be re-established, and it should be re-energized to verify proper operation.
The manual emphasizes several warnings related to installation and operation to ensure the device's longevity and reliable performance. These include using the device according to specified instructions, avoiding direct sunlight exposure to the LCD, ensuring the operating temperature range is met, maintaining a 5cm space behind the device after installation, and securely fixing the device to the panel. It also highlights the importance of installing a switch or circuit breaker close to the device for easy accessibility and ensuring that cables are not energized during installation. The use of flexible, monitored, and twisted cables for input/output lines not connected to the mains is recommended. Finally, it specifies that installation and electrical connections must be performed by technical personnel according to the user's manual and that feeder cables must comply with IEC 60227 or IEC 60245 standards.
General| Diode Test | Yes |
|---|---|
| Continuity Buzzer | Yes |
| Battery | 9V |
| AC Voltage | 200V/750V |
| DC Current | 10A |
| Resistance | 200Ω/2kΩ/20kΩ/200kΩ/2MΩ |
| Display | 3 1/2 Digit LCD, Maximum reading 1999 |
