RCS-9812 crowbar control device uses 16 high-reliability industrial MCU as the main industrial or military use of integrated circuits, high stability and reliability. Full finished LCD, detailed visual information, operation, convenient debugging. Action event recording protection device can operate in the long-term safety of -10 ℃ ~ + 55 ℃ environment, with the time information, and retentive. The application of computer technology devices to protect the arc grounding system, the device has a high compatibility and can be used to control a variety of arc extinguishing device. The device also features both harmonic elimination of various resonance occurs on the PT can accurately determine and eliminate. 1. 16 performance microcontroller core, touch button operation; 2. Accurate acquisition parameters such as voltage and frequency; 3. time monitoring system voltage, the voltage that appears abnormal (arc grounded metal grounding, PT break, the system is too pressure, low-pressure system, the system resonance, etc.) to make accurate judgments and output alarm; 4. With industry-standard RS-485 communication interface; 5. Enter the amount of passive contact, dry contact relay output for output; 6. All the parameters are used in digital adjustment, eliminating the conventional analog potentiometer adjustment method to improve the reliability and stability of the machine; 7. has a strong anti-electromagnetic interference capability for complex in strong electromagnetic interference environments; 8. modular design, refined aluminum shell, embedded installation, plug-in terminal, compact, very easy to install and maintain; 9. The apparatus for arc grounded metal grounding, PT disconnection, system over-voltage, low-voltage and resonant systems such as alarms can be reliable. Works computer arc harmonic elimination device consists of measuring, monitoring, control, consisting of input, output, communication interface and power supply and other components. (1) Measurement precision small part by the transformer (input 0-270V) and pre-signal processing circuit, the voltage from the real-time data acquisition; (2) the output of the whole passive relay contact (220V 5A); (3) communications interface with open half-duplex RS485 interface master-slave mode, the communication speed is 9600, for real-time transmission up crew quantity measurement data and status; (4) the use of high-frequency switching power supply section buck, making it more energy efficient, more can adapt to a variety of different supply voltage environment. In order to improve system reliability, stability, internal reference source with a high degree of stability, the use of software and hardware redundancy fault-tolerant technology; To improve the overall immunity to electromagnetic compatibility protection taken a number of measures to ensure the poor safe working environment can also work.