Application considerations for class 1 div 2 inverter-fed motors

Application considerations for fixed speed motors utilized in hazardous locations are not new to the electrical community, have been discussed previously and are relatively well known in the petroleum industry. Documented guidelines for these applications are currently established that are primarily centered on motor temperature rise limitations and the use of non-sparking fans in class 1 division 2 / zone 2 locations. However, there are additional considerations when motors and their associated loads are on inverter supply. Items such as the effect on motor temperature rise when operating at reduced speeds for units without independently powered blowers, the effect of non-sinusoidal supply at the motor terminals on motor temperature rise as well as rotor voltage related phenomenon are relevant items. This paper identifies and provides guidelines particular to inverter-fed applications for class 1 division 2 installations.