How to Fix Danfoss FC360 Error 85 LCP Key Disabled?

Getting "Err 85" on your Danfoss FC360 drive? This isn't a hardware fault—it's a keypad lockout. Learn how to re-enable your LCP keys in parameter group 0-4.

How to Fix Danfoss FC360 Error 85 LCP Key Disabled?


You walk up to your Danfoss VLT AutomationDrive FC360, press a button on the Local Control Panel (LCP) to start or reset the motor, and instead of the machine springing to life, the display flashes Err 85.

The good news? Your drive isn't broken. There are no blown fuses, no shorted motors, and no damaged circuit boards. Err 85 is a configuration message telling you that the button you just pressed has been software-locked. Here is how to unlock it and get back to work.

What Causes Err 85?

In industrial environments, it is common for engineers to disable certain keypad buttons to prevent unauthorized personnel from accidentally stopping a process or changing settings.

Err 85 occurs when a user presses a key (like Hand On, Off, or Reset) that has been set to "Disabled" in the drive's internal parameters. Essentially, the drive is obeying its security settings.

The Fix: Parameter Group 0-4* (LCP Keypad)

To clear this error, you need to navigate to the LCP Keypad parameter group and re-enable the specific key that is causing the issue. Follow these steps:

1. Access the Main Menu

Press the [Main Menu] button on your LCP. If the [Main Menu] button itself is locked (which is rare but possible), you may need to connect to the drive using the Danfoss MCT 10 software via a PC.

2. Navigate to Group 0-** (Operation/Display)

Scroll down to Group 0 and press [OK]. Then navigate to Sub-group 0-4* (LCP Keypad).

3. Check the Individual Key Settings

Within this group, you will find four primary parameters that control the keypad behavior. Ensure they are set to [1] Enabled:

Step-by-Step Recovery Checklist

  1. Press [Main Menu].
  2. Select 0-** Operation/Display and press [OK].
  3. Select 0-4* LCP Keypad and press [OK].
  4. Check 0-40, 0-41, 0-42, and 0-43. Change any value from "0" (Disabled) to "1" (Enabled).
  5. Press [OK] to save the change.
  6. The Err 85 message will disappear immediately once the key is re-enabled.

Why Use This Feature?

While frustrating when you don't expect it, disabling keys is a powerful safety tool. For example:

  • Preventing Accidental Stops: On critical pumps or fans, disabling the [Off] key ensures that a passerby cannot accidentally shut down the system.
  • Forcing Remote Control: Disabling the [Hand On] key ensures the drive is only operated by the PLC or SCADA system, preventing manual overrides that could upset a delicate process.

Summary

If your Danfoss FC360 is showing Err 85, don't reach for your multimeter. Simply check Parameter Group 0-4*. Someone likely locked the keypad for safety, and you just need to toggle that permission back on to regain local control.

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