German NUEGA plug NUEGA model NUEGA price

NUEGA plug terminal blocks, as a type of connector, are an important component in the electrical industry, playing an irreplaceable and significant role. Since engineering technicians start troubleshooting by checking interfaces, i.e., terminals, the design of terminal blocks is particularly important. Terminal blocks can be classified into: European-style terminal block series, pluggable terminal block series, transformer terminal blocks, building wiring terminals, fence-type terminal blocks, spring-type terminal blocks, DIN rail terminal blocks, wall-through terminal blocks, and optocoupler terminal blocks. The plastic insulation materials and conductive components of terminal blocks directly affect their quality, determining the insulation performance and conductivity of the terminals respectively.

NUEGA plug applications

Mainly applied in lighting, communications, security, and other industries. Pluggable terminals have the widest range of applications, such as in variable frequency drives, explosion-proof equipment, CNC panels, access control controllers, sensors, PLC, instruments, power supplies, servo drives. The common requirements for pluggable terminals in these industries are: stable insertion and extraction force, low contact resistance, and meeting certain life and fatigue endurance standards, which imposes higher requirements on metal spring materials. This requires product designers to have experience in structure and material selection. Fence-type terminals are mainly applied in: power supplies, relays (especially double-layer terminals), inverters, elevator industry (less common), and air conditioners. Requirements for this series of terminals include high torque requirements for screws during wire clamping, the distance when the screw is retracted to its highest position must be greater than the maximum wire clamping range, long-position terminals must not warp or deform, and screws must have high corrosion resistance.

NUEGA plug features

Field control devices feature communication capabilities, facilitating the construction of the plant's lower-level control network. The openness and consistency of communication standards ensure system openness and interoperability between devices. Standardization of function blocks and structures enables interchangeability among devices with identical functions. Decentralizing control functions to the field level provides the control system architecture with a high degree of distribution. Fieldbus technology integrates automation devices and systems into information networks, opening up broader application areas; multiple control devices can be connected on a single twisted-pair cable, reducing installation costs; lowering maintenance expenses; improving system reliability; and providing users with greater flexibility in system integration.

NUEGA plug usage precautions

Fieldbus is gradually being promoted in industrial sites. Many devices not only have traditional instrument functions but also possess fieldbus capabilities. In DCS, fieldbus is widely used. The following issues need attention when using fieldbus: 1) Communication distance. Fieldbus communication distance generally has certain requirements. For example, PROFIBUS/DP at a rate of 12Mbps using standard cable can reach 200m. If using a rate of 187.5kbps, it can reach 1 000m. Communication distance has two meanings: first, the distance achievable between two nodes without repeaters; generally, distance is inversely proportional to communication rate. Second, the distance between the two farthest nodes in the entire network. Manufacturer literature often lacks clarity on this. In actual use, the entire network range must be considered. Electromagnetic signals take time to propagate through cables. Especially in some high-speed fieldbuses, increasing distance requires modifying certain communication parameters. 2) Cable selection. The field environment determines fieldbus communication speed and media. Generally, fieldbus uses electrical signals to transmit data, inevitably affected by surrounding electromagnetic environments during transmission. Most fieldbuses use shielded twisted pairs. Note that different types of fieldbuses may require different shielded twisted pairs. Fieldbus developers usually specify a special cable; only by correctly using this cable can the specified rate and transmission distance be achieved. In extremely poor electromagnetic conditions, optical fiber is a reasonable choice; otherwise, local interference may affect the operation of the entire fieldbus network. 3) Isolation. Generally, fieldbus electrical signals are electrically isolated from the device interior. Fieldbus cables are distributed throughout the workshop. If high voltage intrudes, it can damage the bus transceivers of all devices on the segment. Without isolation, high voltage signals will continue to damage other internal circuits, leading to serious consequences. 4) Shielding. The outer layer of the shielded cable used in fieldbus must be grounded at one point. If high-frequency interference is severe, multi-point capacitive grounding can be used. Multi-point direct grounding is prohibited to avoid ground loop currents. 5) Connectors. Fieldbus generally does not have strict regulations on connectors, but improper handling can affect overall system communication. For example, fieldbus generally uses a bus-type daisy chain connection. When connecting each device, care must be taken to ensure device insertion and removal do not affect existing communication, which imposes certain requirements on connectors. 6) Termination matching. Fieldbus signals, like all electromagnetic wave signals, exhibit reflection phenomena. Resistive matching should be used at both ends of each fieldbus segment. The first purpose is to absorb reflections; the second is to achieve correct voltage levels at both ends of the bus to ensure communication. Therefore, fieldbus technology is the intersection and integration of control, computer, and communication technologies. Its emergence and rapid development reflect the control field's requirements for cost reduction, improved reliability, enhanced maintainability, and increased intelligence in data acquisition.

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