error 84 in danfoss vfd
Danfoss VFD, Error 84 (often appearing as Alarm 84) typically indicates a communication or safety configuration issue. The specific meaning can vary slightly depending on your drive series (VLT AutomationDrive vs. VLT Micro Drive), but it generally points to the LCP (Local Control Panel/Keypad) or a Safety Option mismatch.
1. LCP Communication Lost (Common on FC 51/FC 101)
For the VLT Micro Drive series, Error 84 means the communication between the frequency converter and the LCP keypad has been lost.
Loose Connection: The most common cause is the keypad being loose or the remote mounting cable being damaged.
Firmware Defect: On some specific older versions (like FC 101 SW V2.90), a bug can trigger Error 84 if certain parameters (like language selection) are changed.
Solution: * Power down the drive and reseat the LCP.
If using a remote cable, test it for continuity or swap it with a known good cable.
Perform a Manual Initialization (Two-finger reset): Hold down the
[Status],[Main Menu], and[OK]keys while powering up the drive. Note: This will reset all parameters to factory defaults.
2. No Safety Option (Common on FC 302)
For the VLT AutomationDrive FC 302, Alarm 84 specifically means "No Safety Option." This occurs when the drive expects a functional safety module (like Safe Torque Off) but cannot detect it.
Cause: This usually happens if a safety option was removed or replaced without performing a general reset to tell the drive the hardware configuration has changed.
Solution: * Ensure the safety option card is physically seated correctly in the slot.
If you intentionally removed the card, you must perform a factory reset to clear the drive's memory of that hardware.
Check for 24V DC on the Safe Torque Off (Terminal 37) if your drive uses that feature.
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