Table 3: Severity level of fault in liquid-cooled frequency converter.

Effect Severity of effect Ranking

Hazardous The operation of system may not be safe and/or not in compliance with government regulations (f.x. IEC or UL standard) 9
Very high The primary functionalities are lost 8
High The system is only operable at reduced performance 7
Moderate The overall system performance is affected but the system is functional 6
Low Minor parts of the system operating at reduced performance 5
Very low The fault is noticed but does not affect the overall system performance 4
Minor The fault is often noticed but does not affect the overall system performance 3
Very minor The fault is only noticed in rare cases 2
None No noticeable effect 1