Our control panels are normally provided with PLC in single or redundant configuration (warm / hot type) including CPU, I&O cards, power supply etc., connecting all the plant by serial links or hardwired.
All the system is based on a detailed design study, made according to the customer requirement. FAI is able to provide a whole set of documents for client information and approval:
- P&I and Key Diagrams,
- Wiring Diagrams,
- Logic block Diagrams,
- List of signal with DCS,
- I&O list,
- Cable List,
- Instrument list and data sheets.
Our control system can also be equipped with HMI (Human Monitoring)
Automatic operations are achieved by combined differential level control and time switch.
Differential level system
Differential level detector (ultrasonic, radar or air type) are installed for the automatic control of the screening equipment. This system can foresee a direct calculator and monitoring panel installed at site or single level detector that send the 4-20 mA signals directly at PLC or DCS for level indication or differential calculation.
Variable Frequency Drive System (Inverter) is also provided for the smoothest drive of all rotating equipment when high speed are required.
The combined use of Differential Level System and Variable Frequency Driver applied to our rotating screens makes of our screening equipment the best performing package available on the market.
The fight against the corrosion is one of the must important issue to maintain the best performance for each screening system. In addition to the selection of the best painting system, it is mandatory to install Cathodic protection systemsusing Impressed current or sacrificial anodes.
The Impressed current is a fully automatic (PLC) controlled System that allow completely unatten¬ded operation under all conditions and is used to protect all submerged items including but not limited to: Stoplog guide tracks, bar grid system, rotary screens Main and auxiliary pumps.
Temporary or permanent Sacrificial Anodes, installed by means of S. Steel plates and bolts, are normally designed to protect structure not permanently immersed in the water or during installation period, and are designed for a life time from 2 to 5 years.