The drive's internal control card and its main power card are experiencing a firmware or version processing conflict. This happens often after replacing hardware components without matching the original system configuration.
Cycle power to the drive and press the “Reset” key to clear the alarm. Design Guide VLT HVAC Basic Drive FC 101 - REMAK
Check for any visible signs of overheating, burns, or bent connector pins. Danfoss Vlt Error Code 2563
Check Parameter 5-10 to 5-15 (Digital Inputs) to confirm which input is set to "External Interlock" (typically option 6).
High electromagnetic interference (EMI) from unshielded motor cables or poor grounding can corrupt the internal high-speed data buses of the drive, causing the control board to drop its connection to peripheral cards. E. Damaged Control Board or Option Card The drive's internal control card and its main
Sometimes corrupted EEPROM data causes the control card to misidentify connected hardware.
Observe the LCP during boot-up to see if the error triggers immediately or only when a run command is given. Design Guide VLT HVAC Basic Drive FC 101
if the motor nameplate data (Parameter 1-2*) is inconsistent with the detected motor. Troubleshooting Steps Top ten VFD tech support calls - Danfoss
Did this error happen , or after a configuration change ?
: Internal memory on the power or control cards may have become corrupted or reached the end of its life.