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You should consider several environmental factors when installing a VSD. The following should be checked:
Minimum and maximum ambient temperature limits are specified for all VSDs. Avoiding extreme ambient temperatures prolongs the life of the equipment and maximises overall system reliability. If the VSD is installed in an environment where the ambient temperature is higher than specified, derating of the power is needed. The cooling capability of the air is decreased at lower air pressure. Above 1000 m derating of VSDs should be considered.
Electronic equipment is sensitive to the environment. For instance moisture, dust and temperature can all influence the reliability of electronics. Reduced reliability causes downtime in the application with reduced productivity as a result. Therefore it is important to choose the right solution for the actual application. Basically, it is important to protect the electronics from a harsh environment. The best way to do that is to ensure the electronics are placed outside of the harsh environment where possible.
In most cases you cannot directly see how critical the environment is, It depends mainly on 4 factors, the concentration of pollutants present, dirt the relative humidity and temperature. Most VSD manufacturers offer these solutions to minimize the effect of the environment:
VSDs are usually used by professionals of the trade as a complex component forming part of a larger appliance, system or installation. Therefore note that the responsibility for the final EMC and harmonics properties of the appliance, system or installation rests with the installer who has to ensure compliance with the local regulations.
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