realtime monitoring device for output voltage of AVR

摘要

PURPOSE: A system for real-time monitoring output voltage of automatic voltage regulator for hydraulic roll positioning device is provided to stably control thickness of strip in cold rolling by sensing abnormal indication of the automatic voltage regulator in advance and operating accurate protection circuits at a proper time. CONSTITUTION: The system comprises DEU (DC power supply unit)(10) which is installed in an HYROP (hydraulic roll positioning device) control panel, and in which an AVR (automatic voltage regulator) for supplying HYROP control power supply is installed; an AVR output power supply monitoring part(20) for protecting the AVR itself and real-time transmitting analog and digital data to PLC (programmable logic controller) by detecting output voltage of the AVR; a CTU (control unit)(30) for controlling an inner part of the HYROP by receiving DC power supply from the DEU; an SCU (sequencer unit)(40) for taking charge of interface with external instruments by receiving DC power supply from the DEU; a PIU (printed circuit board unit)(50) which receives DC power supply from the DEU, and on which CPU (central processing unit) and an analog and digital input/output PCB (printed circuit board) are mounted; an STU (serial transfer unit)(70) installed in the HYROP and the high level PLC respectively to carry out mutual serial communication; a high level PLC (programmable logic controller)(60) for giving operation instructions to the HYROP, real-time monitoring operation results and determining whether or not to operate cold rolling mill based on results detected in the AVR output power supply monitoring part of the HYROP; and an HMI (human machine interface)(120) for monitoring and operating operation information of the cold rolling mill and the HYROP supplied from the high level PLC.