Undervoltage

Hva betyr Undervoltage ?

The voltage at the main circuit power supply has dropped below an acceptable operating level. This can be caused by issues in the incoming power supply line, insufficient capacity, or a fault within the power supply itself, leading to insufficient power for the inverter and potential damage if the voltage fluctuates excessively. The inverter output is shut off.

• Sag or complete loss of one or more phases in the incoming AC main power supply (e.g., R/L1, S/L2, T/L3 terminals).
• Insufficient power supply capacity for the driven load, causing voltage drops during peak current demand.
• Loose or corroded connections in the main power circuit, leading to voltage drop under load.
• Faulty main circuit capacitors within the inverter, affecting DC bus voltage regulation.

Klikk på steg for å spore fremgangen.

1. 1

   Measure the incoming AC line voltage at the inverter's main input terminals (R/L1, S/L2, T/L3) using a multimeter or power quality analyzer.

2. 2

   Check for loose connections or corrosion on the main power wiring terminals, both at the inverter and upstream circuit breakers/contactors.

3. 3

   Verify the capacity of the upstream transformer and circuit breaker to ensure they can adequately supply the inverter and motor.

4. 4

   Monitor the DC bus voltage (e.g., using Pr. 08 "DC Bus Voltage" monitor function) during operation to observe sag trends.

5. 5

   Consult an electrician to inspect the facility's power distribution system for sags or imbalances affecting the inverter's supply.