Undervoltage

What does E.UVT mean?

This protective function activates, particularly with PM motors, when the converter voltage drops due to power supply issues like power failure or voltage sags. This causes the motor to coast, and if an automatic restart function is enabled, it may lead to repeated restarting and coasting cycles. Insufficient input voltage can prevent the inverter from maintaining stable operation and delivering rated power, potentially leading to inconsistent process control.

Complete Troubleshooting Guide

1. 1

   Check the incoming AC power supply for stability, voltage drops, or complete power failures using a multimeter.

2. 2

   Ensure that the power supply voltage is consistently within the inverter's specified operating range.

3. 3

   If automatic restart after instantaneous power failure is active, verify its settings (e.g., restart time, voltage thresholds) are appropriate for the application.