What does the process of PLC Panel Building encompass?

 

• The PLC panel building process should start by conducting some basic but vital research.  It is of the utmost importance to deliver a quality PLC panel which meets customers’ needs, keeping the cost to a minimum, and always allowing for future changes.  The client should pick from a list containing control specifications to ensure the manufacturer knows exactly what the client wants.  These specs will be used to mold the concept design for the PLC panel layout and subsequently cover all aspects of the PLC panel’s components, which include safety criteria, design review requirements, and drawing formats.

• The incoming electrical criteria of the PLC panel such as desired Hertz, phases, and voltage should be identified.  The control voltage requirements regarding inputs and outputs also need to be discussed during this stage.  Clients are asked to tell the manufacturer about their preferred brands of motor starters, power supplies, general relays, safety relays, circuit breakers, and disconnects to be used on the PLC panel. 

• The programmable logic controller (PLC) is the most important component on the PLC panel to spec out.  The entire PLC panel will be based around the programmable logic controller.  Most businesses have a preferred programmable logic controller brand due to training on and thus familiarity with that specific brand or software.  If it so happens that the client does not specify a brand, the manufacturer should make a selection from a preferred line of processors.             

• As soon as the components have been selected, the lay-out of the PLC panel should begin.  This will determine the size of the PLC panel.

• The ductwork around the outside edges of the PLC panel should be done next.  All wire-way ductwork and any components that will go on the PLC panel should be checked to ensure it is level and square to the PLC panel.

• Once the outside ductwork is completed, it is time for the internal ductwork.  If PLC panel lay-outs are not available ahead of time, all items to be placed on the PLC panel should be present to ensure the internal ductwork is placed in a way that will leave enough room to access wiring points.

• Before placing any items on the PLC panel beyond the duct and DIN rail, the duct should be drilled out to accommodate the enclosure bolts. 

• All wiring should be done as neatly as possible and labeled evenly.  All motor starters, relays, circuit breakers, and fuses should be labeled accordingly.  A small, handheld sticker machine is usually used for component identification. 

• After the PLC panels have been completely wired, a PLC panel inspection checklist should be used to ensure the PLC panel is ready for use.  At the end of the build, some key questions should be answered.  Some of these questions include: Are the motor overloads adjusted to the correct amperage?  Is the duct drilled out for the enclosure bolts? Are all fuses inserted? Are all terminal blocks properly labeled?

• At the completion of the PLC panel inspection the manufacturer should stamp the PLC panel with an approval stamp.  This signals that the PLC panel is ready for operation.