ABB NTU-7C7 Redundant/Isolated Control Module Termination Unit

ABB NTU-7C7 Redundant/Isolated Control Module Termination Unit

Basic Information

Model and name: ABB NTU - 7C7 Redundant/Isolated Control Module Termination Unit, ‘NTU - 7C7’ is the specific model number of the product in the ABB product line. It is a redundant and isolated control module termination unit, mainly used in industrial automation control systems to ensure reliable transmission of control signals and stable system operation.

Family: It belongs to the ABB control module family for industrial automation. In this series, there are other types of input modules, output modules, communication modules, etc., which work together to form a complete automation control system.

Application Scenario Associated: Widely used in industrial environments that require high system reliability, such as the control of key reaction processes in chemical production, substation automation control in power systems, and the control of key equipment in the process of petroleum extraction and transmission, and other fields.

Functional Features

Redundancy

Control channel redundancy design: With multiple redundant control channels, when one channel fails, the other channels can quickly take over the control tasks to ensure that the control process is not interrupted. For example, in the chemical production process, if the main control channel used to control the reaction temperature fails, the redundant channel can immediately take over the work and continue to regulate the reaction in accordance with the preset temperature control strategy, avoiding production accidents caused by control interruption.

Power redundancy support: Usually supports dual power inputs to provide power redundancy. This means that if one power supply fails, the other power supply can continue to power the unit and maintain its normal operation. In application scenarios such as power systems that require high power stability, this power redundancy design can effectively prevent system downtime due to power problems.

Communication link redundancy: In terms of communication, it is possible to realise redundant configuration of communication links. Multiple communication networks can be connected at the same time or different communication protocols can be used for backup, such as both Ethernet and optical fibre communication interfaces. When the main communication link fails, it can automatically switch to the backup link to ensure the continuous transmission of control signals and data.

Isolation Function

Electrical isolation protection: Provide effective electrical isolation between the input and output of control signals. The isolation voltage level is high, generally up to several thousand volts, e.g. between 1500V - 3000V AC. This prevents external high-voltage interference signals from entering the control system and prevents abnormal signals caused by internal faults from damaging external equipment, which significantly improves system safety in industrial environments with a large number of high-voltage devices (e.g. substations).

Functional module isolation: different control function modules are isolated so that they can operate independently. For example, in complex industrial automation systems, motor control modules and valve control modules are isolated so that even if the motor control part fails, the normal control operation of the valve will not be affected, thus enhancing the overall reliability and stability of the system.

Signal Processing and Terminal Functions

Signal termination and matching: As a terminal unit, it can effectively terminate the input control signal to prevent signal reflection and interference. At the same time, it can match the signals to ensure that the impedance and other characteristics of the signals are in line with the system requirements, improving the quality and accuracy of signal transmission.

Signal Conversion and Distribution: It can convert the received control signals, such as converting signals of different formats or levels into standard signals that can be processed by the internal modules, and then distribute these signals to the corresponding control channels or function modules to achieve precise control of the equipment.

Technical Parameters

Electrical Parameters

Operating voltage range: Generally support a wide range of dual power input voltage, such as 18V - 30V DC, so as to adapt to different power supply situations in the industrial field, and in the event of a single power supply failure, the other power supply is able to supply power stably within this voltage range.

Isolation Voltage Levels: Electrical isolation voltages are typically in the range of 1500V - 3000V AC. This high isolation voltage effectively isolates signals at different potentials and prevents electrical faults from propagating through the system.

Power Consumption: Considering the redundant design may increase the energy consumption, but the overall power consumption is still in a reasonable range, generally between 10W - 30W, the specific power consumption depends on the working status and load condition of the equipment.

Performance Parameters

Switching time: When redundant channels, power supplies or communication links are switched over, the switching time is very short, generally in the milliseconds, for example, the switching time may be between 10ms - 50ms, such a short switching time ensures the continuity of the system and reduces the impact on the industrial process.

Number and type of control channels: multiple control channels, the number may vary according to the specific product configuration, generally between 2 - 4, these channels can be digital signal channels or analogue signal channels to meet different control requirements.

Environmental parameters

Operating temperature range: it can work normally in a wide temperature range, usually - 20℃ - + 70℃, some high-performance models may support a wider temperature range, which makes it adaptable to a variety of harsh industrial environments, such as high-temperature chemical reaction workshop or cold outdoor equipment control scenarios.

Humidity range: The relative humidity range is generally 5% - 95% (non-condensing), which enables stable operation in humid industrial environments without performance degradation or malfunction due to humidity changes.

Protection level: High protection level, such as IP20 - IP30, can effectively prevent the intrusion of foreign objects and prevent people from accidentally contacting the internal circuit, to protect the safety and reliability of the equipment.