VLT Control Cards

The VLT FC Series control cards serve as the primary control and interface boards inside Danfoss VLT frequency converters, managing essential drive control tasks and providing the internal links to operator interfaces and I/O hardware. Because these drives contain DC-link capacitors capable of retaining hazardous voltage after power is removed, all power sources must be isolated and the specified discharge time allowed before accessing any control electronics. The control card assembly interfaces directly with the Local Control Panel and is located behind the LCP cradle and front cover, making it a field-replaceable module within the drive. It connects to the system's modular hardware through removable I/O terminals and option expansion slots, with dedicated shielding and cable-routing features to maintain EMC performance. Depending on configuration, additional internal ribbon-cable connections may be present for optional functions, and safety-option variants require particular care during disassembly to prevent damage to connectors or cables.