Fluctuations in the drive’s internal 24V DC supply can cause the control card to "glitch" and report an internal communication error. Troubleshooting & Fixing Error 2563
If the error returns immediately after a power cycle, the issue is likely physical. Danfoss Drives - Basic Troubleshooting of VLT Series Drives Danfoss Vlt Error Code 2563
Check that the drive and motor are grounded to a common, low-impedance ground point. 3. Inspect for Physical Damage Fluctuations in the drive’s internal 24V DC supply