Sunday, November 6, 2022

Control system design

Best part being an automation engineer in small-scale firm which manufacturing special machine is you could have opportunity to involve in all steps of manufacturing.

  • Design and drafting 
  • Production 
  • Factory testing 
  • Commissioning 

Let me explain all steps based on my previous company experience.

Design and drafting

This part is the most important area. Here we discuss the with client and note all the requirements from the client side. Mechanical design engineers check the space constraints and prepare the spacing layouts and complete the dimensions.

In the Electrical design section includes the following steps:

Design of sequence of operation.

Sequence of operation design is based on the clients required. From the client side, they give the process details or machine operation details and final product. According to that one, we design the sequence of operation.

Design of Cause-and-effect matrix.

Cause and effect matrix designs includes operation of machine in the different mode like auto, semi-auto, manual. In this section, we design the response of the machine when the inputs are energized. Emergency response of the machine is designed in this section. From these we will get the exact idea of machine response. According to these causes and effect diagram, we prepare the operating manual and parameter list.

Design of schematic diagram.

Once panel SOP and Cause and effect design completed according to that we prepare the schematic diagram for the machine in this section we select the controller and input and output allocation.


Panel sizing, IO listing and material selection.

After schematic preparation we prepare the general layout of the control panel and according to that we decide the panel size also need to consider the temp effect in panel. VFD panels required additional cooling systems.

Cable routing design

From the 3D models of the machine, we prepare the cable routing and cable tray locations. As per the electrical load, we select the cable size. For instruments required specials cables for the communication systems requires shielded cables. As per the cable's selection, we prepare the cable Termini nation Lay-out. According to the glands and gland plate size is done.

BOM preparation

From the above sections we prepare the bill of materials and in this section, we consider the costing side. We take Quotations from different suppliers and finalize the materials.

Production.

In this section, design is handed over to production department. As per the schematic and BOM, they prepare the control panel wiring and fix it in the machine. Cable routing and terminations are done as per the design.

PLC programming, HMI Design and testing.

As per the sequence of operation and IO listing, we prepare a logic program. Initial stage program output is simulated using software and verify the cause-and-effect diagram. Once simulation is ok then we download the Program to the actual controller.



 To be continued......

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