Danfoss has expanded the condition-based monitoring (CBM) capabilities of its VLT variable frequency drives to include sine-wave filter capacitor supervision. This enhancement enables earlier detection of component degradation, helping prevent unplanned downtime in critical applications.
The new function continuously monitors sine-wave filter capacitors, which have a known end-of-life due to internal material changes. Using built-in algorithms, the system checks capacitor condition every two days. If capacitance values fall below preset thresholds, it triggers a warning or alarm, allowing maintenance teams to replace components before failure occurs.
Sine-wave filter monitoring is particularly beneficial in applications with long cable lengths, retrofit systems using older motors, and sensitive environments such as hospitals and laboratories. It also supports high-performance applications and motors with specific insulation or winding characteristics.
The CBM function does not require external sensors and can be commissioned in both new and existing systems. Drives equipped with this function include:
VLT Refrigeration Drive FC 103
VLT AQUA Drive FC 202
Enhanced VLT HVAC Drive FC 102
VLT AutomationDrive FC 301 / FC 302
“Our enhanced condition-based monitoring capabilities, including sine-wave filter monitoring, empower our customers to move from reactive to proactive maintenance strategies,” said John Bargmeyer, Product Owner at Danfoss Drives. “By detecting potential issues early, we help them minimize downtime, reduce maintenance costs, and improve the overall reliability of their operations.”