Overvoltage

What does -OSF mean?

This fault indicates that the DC bus voltage within the drive controller has exceeded a safe threshold during steady-state operation or acceleration. The primary cause is typically an input line voltage that is consistently higher than the drive controller's nominal rating, which can stress and damage internal power components like the DC bus capacitors and IGBTs.

Complete Troubleshooting Guide

1. 1

   Measure the incoming line voltage with a multimeter and compare it to the drive controller's specified input voltage range on its nameplate.

2. 2

   If the line voltage is consistently high, identify and correct the source of the overvoltage (e.g., utility supply voltage too high, incorrect transformer taps).

3. 3

   Reset the drive controller after verifying the line voltage is within acceptable limits to clear the fault.