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BAGASSE HANDLING SYSTEM –24 MW CO-GEN PLANT AT SAMEERWADI

WRITE-UP ON CONTROL SYSTEM ARCHITECTURE

The control system will be based on available models of reputed makes of PLC, having all flexible features, which are normally found In large PLC’s.PLC system included will be non redundant type , made up of digital inputand output modules of 16 channels type.

 All the I/O modules are housed in the Control Desk. The status of all pullcord switches and belt sway switches for each belt conveyor (all connectedseries), ZSS, the status of the drives (ON/OFF), bunker levels, level at thestacking point at stack pile, etc., are wired to the input interface modules of the PLC. In addition, other inputs, such as, mode selection, path selection,drive ON/OFF operation on manual mode using PB’s, etc., which are allmounted on the Control Desk, will also be connected to the input interface

modules.

The CPU and power supply modules are located in the control desk. Thesignals received at the I/O modules communicate with the CPU. The ladder application program (to be developed by PLC equipment supplier) will beloaded in the PLC. The MMI software provided for the system takes thesestatus inputs from the PLC and also from the PC and Keyboard. One monitor for the operator station is also provided.

The outputs, which are activated by PLC’s will drive the output relaysmounted in the CD itself. Set of required number of outputs available in thePLC will be wired up for indication in mimic panel (part of CD). This will

enable the operator to quickly understand the fault and take remedial action.Separate group communication windows are provided in the mimic panel toidentify whether PCS or BSS or ZSS operated and also which drive hastripped, i.e., correlating the above two, the operator will understand whether aparticular drive has tripped due to its PCS operation. In case, only the drivetrip annunciation comes, then he will understand it is due to its overloadoperation.

 Any fault in the PLC system will also be diagnosed automatically andannunciated.

 Annunciations :

 List of annunciations are furnished in the attached annexure.

Power Supply

 A 230V UPS power system of adequate capacity (to be supplied by Fenner)shall provide power supply for the CPU, PC and also for the I / O interfacecards and output relays.

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Interface Wiring Cabling

 All the DI /DO signals from MCC, Local Panels, etc., will be received at theControl Desk. In the case of wiring from MCC, all the DI /DO signals will bechannelled through an interlocking module provided in the MCC, separately for each bus section, i.e., the contacts ‘from’ and ‘to’ the individual drive moduleswill be wired through inter modular wires within MCC itself. Grouped cableswill then take off from this interlocking module to the control desk (PLC).

Other Features

 At least 10% spares of I / O modules are provided in the control desk.

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