REJIM

Control for thermic roll furnace

Purpose

The system is developed for controlling temperature condition of a thermic roll furnace.

The furnace serves for heating the titanium alloy plates or heat-resistant stainless steel before their rolling and thermal processing. Temperature range of the furnace work is 50-1100oC, condition duration is up to six hours. The required heating precisenes is - 2 C.

Regulating of the furnace temperature is implemented due to the work of speed pulse gas-jets (40 gas-jets- 5 per each working area).

Basic functions

• reaching the temperature condition set by the operator.
  
• regulating the temperature in the furnace within the period set by the operator (control for gas-jets)
  
• sustaining optimal gas pressure.
  
• sustaining optimal air pressure.
  
• data receipt and transmitting to the operator"s control board (upper level PC)
  
• data receipt and transmitting to the local control board (display on the door of the control panel).
  
• gas supply cut-off in case gas pressure exceed the permissible level (switching off the power supply also leads to gas cut-off).
  
• emergency adjustment.
  

Control system structure

The control system is supplied as three control panels and upper level PC.

The control panels contain:

• safety automata;
  
• uninterruptible power systems (UPSs);
  
• Allen-Bradley controller;
  
• gas-jets kindling and flame presence control device;
  
• safety circuits controller LOGO series by Siemens;
  
• terminal strips;
  

The door of one of the control panels contains an LCD with sensor DIGITAL PROFACE GP-570 display operator"s local board)

The regulating controllers and computer are united in local network DH+. Operator may control the system from the PC or from the panel located on the control panel door.

Local control panel

Operator"s panel is located on the control panel and is designed for local control of technological process, it duplicates the basic functions of the operator"s workstation.

Operator"s panel is an LCD display with a sensor monitor which makes the work with it easier, reduces the time spent in training an operator and excludes any mistakes in the work.

The panel ensures changing the setting, execute all technological operations

Operator"s station

Operator"s station is the basic workplace of the operator. It allows to control the work, checking the states and simultaneously reacting on different situations in the thermic furnace.

Basic functions of the operator"s station:

• displaying system"s state and sensors values;
  
• alert and warning signaling;
  
• transmitting the commands from the operator to the controller;
  
• transmitting the system"s settings to the controller;
  
• saving to hard disk sensors values, operator"s commands, system"s settings, states, i.e. events archiving
  
• reviewing archives;
  
• setting the gas-jets modes;
  
• switching on/off the gas-jets;
  
• changing parameters.