6.2 Σ-V-SD Driver6-11 Installation66.2.4 Installation PrecautionsObserve the following precautions when designing the control panel.(1) General PrecautionsGeneral precautions are given below.• Always use a sealed structure for the control panel.• Install the units so that maintenance inspections, removal, and installation can be performed easily.• Provide about 100 mm of space between components and the control panel surfaces so that the flow of air isnot blocked inside the control panel.• Design the control panel so that the average internal air temperature will be no more than 10°C higher thanthe external air.• We recommend the use of a fan to stir the air to increase cooling efficiency and prevent localized tempera-ture increases in the sealed control panel.• Separate the units from cables or components of 90 VDC or higher and cables or components for AC powersupply by at least 10 mm to help prevent malfunction due to noise.• Separate the primary and secondary sides of transformer and noise filters.(2) Installation PrecautionsPrecautions for installing the Σ-V-SD driver are given below.• Always secure the Σ-V-SD driver on a vertical surface using screws or bolts.• Provide the specified space on the left, right, top, and bottom of the driver to enable maintenance and venti-lation. For details, refer to 6.2.5 Installation Orientation and Space.• Place the heat sink of the Σ-V-SD driver outside of the ventilation ducts to allow external air flow throughthe heat sink. The loss from the control panel will be reduced, and the majority of the loss from the unit willbe cooled directly by the external air.• Cooling the heat sink requires an air flow of 2.5 m/s in the ventilation duct.• Make sure that cooling air flows through the heat sink for each Σ-V-SD driver.• We recommend a metal cooling fan. Plastic fans will deteriorate when exposed to cutting oil, which maycause Σ-V-SD driver failure or other problems.Σ-V-SD Driver InstallationUnitHeat sinkVentilation ductCooling fanFlow of the external airFlow of the external air
