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MAY 2018 I SMT007 MAGAZINE 69 An example of the detailed information that was able to be obtained from one of the reflow ovens appears below in Figure 6. Control/Monitoring Hardware Deployment The next stage in the deployment was decid- ing where to place the temperature sensors and controllers on the factory floor. Figure 7 shows the layout of the produc- tion floor highlighting the location of the all air handling units (AHU) and the duct work feeding air to the floor. In this case, there are 6 AHUs feeding air ducts spaced at 20m-centers spread evenly above the factory floor. Each air duct line has a set of six diffus- ers to direct the air where needed. Prior to the deploy- ment of the IIoT energy solu- tion, all these AHUs would simply be running all the time pumping cool air indis- criminately throughout the entire floor based on some average temperature they were being asked to maintain. This resulted in obvious cool and hot spots on the production floor based on the concentration of equipment generating heat. This concentration can be seen in the equip- ment line layout shown in Figure 8. The SMT lines are located at the top and left sides of the factory floor while all the environment test chambers are located on the right side. These chambers typically will consume lots of power Figure 6: Detailed SMT reflow oven power consumption information. Figure 7: IIoT control vs. line layout (control air conditioning).