Drives Service & Support > PowerFlex 700 > Fault Finder

Fault Number : 17

Fault Display : Input Phase Loss

Fault Name : Input Phase Loss

Fault Type : None

Fault Description : The DC bus ripple has exceeded a preset level.

Corrective Action : The most common cause of this fault would be a loss of a phase on the incoming line. This will cause the bus ripple to increase going beyond specifications. This can also be caused by extremely noisy utility power, or disturbances being induced on the line. An example would be a punch press on the same transformer line as the drive. These presses put large spikes on the power line, and can wrachet the voltage on the bus quite dramatically.

If a noisy power supply line is inevitable, then an isolation transformer or a line reactor may be necessary.