- Radio interference suppression filters: Components used to reduce electromagnetic interference (EMI) emitted by electrical devices, ensuring compliance with EMC standards.
- Ramp time: The time it takes for a variable (such as voltage, speed, or torque) to increase or decrease smoothly from one value to another, typically during motor startup or braking.
- Rapid Link: A modular and compact system used for motor control and protection, allowing fast installation and easy configuration.
- Rated motor current: The maximum current a motor is designed to carry continuously under specified operating conditions.
- Rated operational current: The current a device (such as a contactor or breaker) can carry during normal operation without degradation.
- Rated speed: The speed at which a motor operates under full load and rated voltage/frequency, usually given in revolutions per minute (RPM).
- Rated torque: The torque a motor is capable of delivering continuously at rated power without overheating.
- RC suppressor: A resistor-capacitor network used across relay or contactor coils to suppress voltage spikes when switching inductive loads.
- Reclosing lockout: A safety mechanism that prevents a circuit breaker from automatically re-closing after a fault, requiring manual intervention.
- Rectifier: A device that converts alternating current (AC) into direct current (DC), commonly used in power supplies and DC motor drives.
- Reference letter contactor relays: Standardized letters used in schematics and documentation to identify relay types or functions.
- Reflected-light beam: A sensing method in which light is emitted and reflected back to the sensor by a surface, used to detect object presence or distance.
- Reliability values: Statistical indicators (such as MTBF—mean time between failures) that describe the expected operational reliability of components or systems.
- Remote operator circuit-breaker: A breaker that can be opened or closed from a distance via a control signal, enhancing safety and convenience.
- Remote switch off: A function that allows power to be disconnected from a device or system using remote control, for safety or energy-saving purposes.
- Remote switch-off circuit-breaker: A circuit breaker with built-in functionality to be tripped or reset remotely via control circuits.
- Remote tripping: Triggering a breaker or relay to disconnect power through a remote signal, often used in fault detection or emergency stop systems.
- Residual current protection: A system that detects leakage currents to ground and interrupts the power supply to prevent electric shock or fire.
- Residual-current relays: Protective relays that monitor the difference between incoming and outgoing current to detect residual current faults.
- Resistor: A passive electrical component that limits or regulates the flow of electric current in a circuit by providing resistance.
- Resistor, General symbol: The standardized graphical representation of a resistor in an electrical schematic.
- Reversing combination: A control assembly enabling a motor to run in both forward and reverse directions, typically using two contactors and interlocks.
- Reversing contactor: A contactor used as part of a reversing circuit to change motor rotation direction by altering the phase sequence.
- Reversing star-delta: A starting method for motors that combines star-delta configuration with reversing capability, allowing bidirectional operation.
- Reversing starter: A motor starter setup that enables reversing of motor direction using appropriate switching and protection elements.
- Reversing starter, SmartWire-DT: A network-compatible motor starter that allows integration with SmartWire-DT communication systems for remote control and diagnostics.
- Reversing switch: A manually or electrically operated switch used to reverse the direction of current flow, typically to change motor rotation.
- Risk reduction in the fault scenario: Safety strategies and measures aimed at minimizing hazards and consequences during equipment or system faults.
- RMQ-Titan®: A series of modular pushbutton and signaling devices used in industrial control systems, known for durability and flexibility.
- Root-3 circuit: Refers to the square root of 3 (√3), commonly used in three-phase electrical calculations for voltage and current relations.
- Rotor-critical: A rotor speed range that can induce mechanical resonance or instability; should be avoided in variable speed drives.
- RS flip-flop: A basic digital logic circuit with two stable states used for storing binary information, commonly used in automation and control.
- RS232: A standard for serial communication used to connect computers and peripheral devices, often for configuration or data exchange.
- RS485: A serial communication protocol supporting multiple devices on the same bus over longer distances, widely used in industrial networks.
Published by Leonardo Tomás Cardillo
https://www.linkedin.com/in/leonardocardillo
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