The actual value of DC bus voltage is dependent on many parameters some of which are:ĭue to the above factors, DC bus voltage under normal condition could vary a lot. For a 415V 3 phase system drive idle DC bus voltage should be around 586V. Hence for a 480V, 3 phase system the expected idle DC bus voltage should be around 678V. The ideal DC bus voltage for a 3 phase VFD under idle (not running) condition should be approximately square root of 2 multiplied by the AC RMS voltage. In these cases, it is important to know where the voltage signal is derived from for overvoltage fault code troubleshooting. It does not matter if the drive is running or not.Īlso read- How to measure DC bus voltage and DC bus voltage rippleįor large HP drives, medium voltage (high voltage) drives, there could be overvoltage fault protection on the input, DC bus and on the output side. Note: Overvoltage protection for drives is turned on the moment drive is powered ON. This guide will help you in troubleshooting VFD problems with overvoltage fault code. Any and all events that could cause a jump in DC bus voltage could lead to a dc link overvoltage fault event. It is important to realize this fact to aid in troubleshooting. Drive (VFD) overvoltage protection for common low HP drives is based on the measured voltage on the DC bus of the unit and not the input AC voltage.
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