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<\/a><\/figure>\nA manufacturer that produced a blend of powders for consumers contacted EXAIR for electrical panel cooling.\u00a0 They had two large mixers that would mix different powders.\u00a0 One mixer could fit a total weight between 2,200 lbs. to 4,400 lbs. (1000 kg to 2000 kg) of powder.\u00a0 The second one was between 220 lbs. to 2,200 lbs. (100 kg to 1000 Kg).\u00a0\u00a0\u00a0 By mixing powders, this was a very dusty environment.\u00a0 One potential problem was the over-temp fault with their VFDs, (Variable Frequency Drives).\u00a0\u00a0 VFDs control the speed of the motors that run the paddles.\u00a0 In this industry, production is very extensive, and they wanted to prevent the fault with over-heating from occurring.\u00a0<\/p>\n
<\/a><\/figure>\n<\/div>\nIn our discussions, they were interested in our EXAIR Cabinet Coolers<\/a>. I asked the general questions to correctly size the Cabinet Cooler.\u00a0 For this electrical panel, they used panel fans to cool the internals.\u00a0 Some problems with panel fans are that they will draw the warm ambient air to try and cool what\u2019s inside.\u00a0 It can make it difficult during high summer temps.\u00a0 Also, fans require filters to remove the dust from the environment from entering the cabinet.\u00a0 The plant had a dirty environment and the powder was able to clog the filters. This condition reduced the effectiveness of fan cooling and still allowed dust to get into the electrical panel.\u00a0 The result was that the VFDs were unable to operate properly under such conditions.\u00a0<\/p>\n EXAIR Cabinet Coolers have an option called the Non-Hazardous Purge (NHP) System<\/a>.\u00a0 This product is designed to continuously bleed about 1 SCFM (28 SLPM) of compressed air into the cabinet when not operating.\u00a0 This will cause a slight positive pressure to keep any dust particles from migrating into the electrical cabinet.\u00a0 With the installation of the Cabinet Coolers, the vents and panel fans are removed and covered for proper cooling.\u00a0 This helps to reduce the amount of powder that can migrate into the panel and reduces the maintenance cost of changing or cleaning the panel filters.\u00a0<\/p>\n From the heat load calculation, I recommended the NHP4340<\/a>, which produces 2,800 BTU\/hr of cooling.\u00a0 With this complete system, which included the thermostat control and the NHP solenoid valve, the company was able to save compressed air during the cooler months, keep the dust out of the electrical panel, and had a reliable way to keep the VFD from tripping on high heat.\u00a0 If you would like more information about our Cabinet Coolers<\/a>, you can always contact an Application Engineer<\/a> at EXAIR.\u00a0 We will be happy to help you.\u00a0<\/p>\n John Ball Photo:\u00a0Large mixer by Charlemagne<\/a>.\u00a0\u00a0Pixabay Content license<\/a><\/p>\n
Application Engineer
Email: johnball@exair.com
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