Fix: Increase the (Parameters 3-42 or 3-52) or activate "Overvoltage Control".

The drive will usually trip and stop the motor, requiring a power cycle or reset. Primary Causes of Error 1027

Configure a digital input (e.g., Terminal 18) with . A momentary closure clears the alarm.

Comprehensive Guide to Troubleshooting Danfoss Error 1027 In industrial automation and HVAC system control, Danfoss VLT Frequency Converters are heavily relied upon to manage motors efficiently. When production lines grind to a halt or an air handling unit shuts down, the Local Control Panel (LCP) on the variable frequency drive (VFD) serves as the primary diagnostic window. Among the deeper, more complex internal faults that can surface on high-performance models like the VLT AutomationDrive FC 302 is .

If the error returns, check if any option cards (e.g., Fieldbus, I/O modules) are installed. Power down and remove the main control panel.

The 1027 error is categorized within the internal processing fault block. It represents a strict system lockout. Diagnostic Category Value / Status Technical Definition 1024–1279 Internal Communication & CAN Bus Range Specific Code CAN Telegram Cannot Be Sent Drive Status Immediate motor coast-to-stop Primary Mechanism Hardware Failure Physical link or control component failure Step-by-Step Troubleshooting Procedure

When this critical internal error trips, the VFD drops output voltage, causing the motor to coast to a complete stop to protect its components. Resolving this issue requires a structured diagnostic approach to pinpoint whether the fault is transient, environmental, or an outright control card failure. What Causes Danfoss Error 1027?

Danfoss option cards like the VLT® MCA 101 (Profinet), MCA 104 (EtherNet/IP), or MCA 120 (Profibus) can fail due to ESD damage, power surges, or internal component aging.

If a factory reset does not clear Error 1027, the internal EEPROM chip or the control card itself has suffered hardware failure. Control Card Replacement

Verify zero voltage across all input and output terminals using a certified multimeter. 2. Inspect Internal Control Connections

[Isolate Power] ──> [Inspect Cables/EMI] ──> [Check Error Logs] ──> [Perform Hard Reset] 1. Perform Safe Power Isolation

This article provides a deep technical dive into Danfoss Error 1027. We will cover what it means, its common causes, step-by-step diagnostic procedures, and both field-level and long-term solutions.