Analogue Panel Control Cabinet
The whole feed plant can be operated directly on the analogue panel with centralized control. All sections are fitted with ammeter and have both manual and automatic functions. It is responsible for monitoring management and displaying the process flow diagram, voltage, current and rotational speed. It is made of imported PVC, resulting in clear diagram. It shows the running condition of equipment and provides man-machine dialogue with objective and convenient operation and control.

Principal Functions
The functions of automatic control system of feed mill can be divided into two parts: control and management. The control of on-site main equipment can be implemented by sending signal to PLC through buttons and also can be directly controlled by PLC. The function of management refers to monitoring management on formula and production report through the batching computer.

1. Interlocking function
According to the technological features of feed mill, control panel is used to realize the sequential starting opposite to the material flow direction and sequential stopping in accordance with the material flow direction. When equipment is in trouble during its running, it trips the interlocking control (turning off all relative equipment before the equipment in trouble and discharge gate). The interval of starting time between equipment can be adjusted willfully according to actual conditions.

2. Alarm function
The control system carries out real-time monitoring on running conditions of on-site equipment, material level, conveying travel. When trouble occurs, PLC automatically inspects the trouble signals and reflects on the analogue panel to send acoustoopic alarm. And control adjustment and interlocking are carried out according to the preset program of PLC.
1) Overload, under-voltage and electric short alarm: When all equipment trips due to above reasons, acoustoopic alarm is sent to control the previous process for automatic stopping.
2) Material level alarm: When bin is full, level signal can be inspected through upper level indicator to control the previous process for intake stopping through PLC alarm.
3)Anti-blockage alarm: Drag conveyor, elevator and screw are fitted with anti-blockage device. Alarm can be sent through inspection of signal of rotational speed and limit switch.

3. Flexible control
1) The control and operation of system adopt a method combining manual operation and automatic operation which can be switched freely. Manual operation is mainly used for single machine commissioning, machine stopping due to trouble and manual trial run after trouble shooting. During the normal operation, the automatic operation in the central control room is adopted. There is a provision for manual mode operation in case the PLC fails.

2) Selection of process: Operator can, according to requirements of production, selectively control the running or stopping of specific process to meet the needs of production. Processes are divided into raw materials receiving, grinding, batching and mixing, pelleting, bagging, etc. After one or several processes are selected, the selected processes can run automatically.

3)Emergency stopping: If sudden trouble occurs to equipment or there is other problems when system is in production state, operator can stop the equipment through the emergency stopping button so as to avoid the loss caused by equipment trouble.

4. Safe and Reliable System
The system adopts TN-S system, motor power 380V, control power 220V and display power 24DV. The whole system has been separately grounded to ensure the system is safe and reliable.

5. Automatic Producing of Report
According to contents of database of batching computer, shift, weekly, monthly and yearly production report can be produced through statistics. The format can be self-designed according to requirements.