What are the power losses of MICROMASTER Drives and accessories and how is temperature rise calculated?
Like all electrical equipment, inverter drives produce waste heat. This heat must be removed to prevent the drive overheating. As most commercial electronics is limited to 70°C (the internal junction temperature must be limited to 125°C or 150°C, but is usually maintained below this), the maximum temperature of the cooling air surrounding, or supplied to the drive is therefore limited to 50°C. For some types and applications, this is reduced further to 40°C (see operating instructions and specification for details). It is normal to install the drives, together with other equipment, in a cabinet or similar installation. The temperature of the air inside the cabinet must therefore be calculated. In some cases, cooling air may be supplied by an external fan or ducting. In these cases, the calculation will need to account for the amount of air, as well as its temperature. As part of the design of the installation, the following steps should allow the calculation of the temperature rise, an
