Cause : Armature current ripple comes when excessive fluctuations or ripples in the armature current of a motor. This  can lead to poor performance, increased heating, and mechanical vibrations.

F517 fault in ABB DCS800 drive Armature current ripple fault. This means that the current flowing through the armature winding of the motor has excessive fluctuations or ripples.

Here’s a guide to troubleshoot and address excessive armature current ripple:

1. Check Power Supply Quality:

• Measure the DC bus voltage to verify if there are any fluctuations. High ripple on the DC bus can lead to instability in armature current.
• Inspect the AC power supply for irregularities or voltage imbalances, which may contribute to fluctuations on the DC bus and subsequently in the armature current.

2. Inspect Drive and Motor Connections:

• Check all connections between the drive and the motor. Loose or corroded connections can cause intermittent contact and ripple in the armature current.
• Ensure that grounding is secure and consistent throughout the drive system to minimize electrical noise that can interfere with current stability.