Look at the rotary switches or DIP switches on the expansion modules.
Cycle power to the drive and press the “Reset” key to clear the alarm.
The of your controller (e.g., AK-CC55, AK-SM 800) What expansion modules or displays are connected
Once you’ve resolved the immediate failure, implement these engineering best practices to avoid recurrence.
: Keep control cabinets clean and dust-free. Overheating accelerates the breakdown of the delicate electronic components that handle data processing. danfoss error 1027
Hold for 5 seconds until the display prompts , then clear it with the reset key. Hardware Validation Matrix
The problem isn’t the drive — it’s the PLC. If the master stops sending cyclic I/O due to a program crash, power loss, or halted scanner task, all slave drives will log 1027 simultaneously.
There may be a physical fault or a failure in how the drive’s internal components "talk" to each other. Step-by-Step Troubleshooting
: Aged capacitors or failing logic gates on the drive's control board can cause voltage ripples that corrupt the data path. Look at the rotary switches or DIP switches
The Danfoss error code 1027 is a fault code that appears on Danfoss VLT drives, indicating a problem with the drive's operation. According to the official Danfoss documentation, error code 1027 is defined as:
: If the network infrastructure checks out, the problem most likely resides inside the frequency converter itself. The official Danfoss documentation is explicit about this, classifying Error 1027 under the "Internal fault" alarm (Alarm 38). This indicates a failure that cannot be fixed by the end-user. A hardware failure might involve:
If the error persists after a factory initialization, use this table to cross-reference component states: Component Status Indication Recommended Action Thermal stress on ASIC processor chip
Follow this field-tested workflow. It assumes you have a multimeter, a laptop with Danfoss MCT-10 or VACON® NCDrive, and physical access to the drive. : Keep control cabinets clean and dust-free
If your Danfoss drive is flashing Error 1027, follow these steps to diagnose and potentially fix the issue: 1. Perform a Hard Reset
Theoretically, set Parameter 8-03 Control Timeout Time = 100 seconds (max). But this is dangerous – the drive would run uncontrolled for over a minute. Not recommended for safety.
Verify that any optional modules are seated correctly in the slots.
Release the keys; the drive should now be in its default state. MyDrive® Assistant Recommendation
Ensure the main power supply is completely disconnected and locked out. Wait at least 20 minutes after power-down for internal DC bus capacitors to fully discharge before touching any internal components.