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Today, VFD manufacturers like Gozuk offer a well defined life cycle management plan which ensures that any <a href="http://www.vfds.in/">VFD</a> is maintained to the highest standards, thereby ensuring that the risk of failure is minimized. The life cycle management plan looks after all likely areas of VFD failure and makes sure there is a plan in place to combat any risk. 
For example, inadequate cooling is a common source of failure. If VFDs are not maintained according to the manufacturers maintenance schedules - such as regular replacement of air filters and annual checking and cleaning of heat sink fins - then insufficient air flows through the VFD, causing failure.
It is important to know that standard VFDs without all-pole effective sinusoidal filters have block shaped (square wave) or pulse width modulated (PWM) output voltages. As outlined in the European standard for rotating electrical machines, DIN IEC/TS 60034-17, this type of power supply waveform presents potential hazards for motor bearings and windings. In particular, small motors, like those integrated into fans, are at danger. The standard describes the increased stress on the motor windings through voltage peaks, and the hazard of bearing currents through capacitive coupled voltage, which can provoke the premature failure of the motor bearings.

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Date Joined:	2013-10-18 22:32:13
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