For CNC technicians and maintenance professionals, there are moments when a “clean slate” is the only path forward. Whether you are dealing with persistent memory corruption, preparing a machine for a complete reconfiguration, or troubleshooting deep-seated system errors, knowing how to manually clear system parameters is a fundamental skill.

At T.I.E. Industrial, we understand that downtime is the enemy of productivity. This guide breaks down the hardware-level sequence required to wipe parameters and reset your Fanuc control system.

Critical Pre-Procedure Warning

Before proceeding, ensure you have a verified backup of all machine parameters, pitch error compensation, tool offsets, and macro variables. Clearing parameters is an irreversible action that will render the machine inoperable until the original manufacturer (OEM) data is reloaded.

Step-by-Step Guide: The Parameter Deletion Sequence

The following procedure bypasses the standard software interface and utilizes the boot-level hardware commands.

1. The Initial Power-Up Sequence

With the machine completely powered down:

1. Locate the [RESET] and [DELETE] keys on the MDI keyboard.
2. Press and hold both keys simultaneously.
3. While holding the keys, turn the controller power ON.
4. Important: Continue holding these two keys throughout the entire booting process until the system initialization screen appears.

2. Entering the Memory Clear Menu

Once the system has initialized into the boot-level menu:

1. Press the [1] key on the keyboard.
2. The system will prompt you with a confirmation message: “Are you sure you want to erase parameters?”
3. Select YES to confirm.

3. Loading the System Program

After the initial erase, the system requires an “Input” trigger to cycle through its internal logic:

1. Press and hold the [INPUT] key.
2. Maintain the hold while the system loads the necessary internal programs.

4. Navigating the All-Clear Menu

Once the program loading is complete, you will be presented with a numbered menu. To perform a comprehensive wipe:

1. Select Item 3 from the menu.
2. From the subsequent sub-menu, select Item 2 (labeled “All Parameters”).
3. When prompted for confirmation, select YES.

5. Finalizing the Reset

To finalize the operation and commit the changes to the system’s memory:

1. Press the [0] key on the keypad.
2. Power the machine OFF.

Post-Procedure: Verification

After the machine has been turned off, wait approximately 30 seconds and power the machine back on. You will notice that the system is now devoid of its previous parameter set, and most likely, the controller will display several alarms (such as APC or Servo alarms) because the configuration data is missing. This confirms the clearing process was successful.

Restoring Your Machine

A controller with cleared parameters is a blank canvas. Your next steps will involve:

• Reloading the SRAM backup via CF Card or USB.
• Restoring OEM-specific parameters.
• Re-homing axes and calibrating tool changers.

Need Replacement Parts?

If your controller is failing to hold parameters even after a reset, you may be facing an SRAM module failure or a depleted backup battery.

Reach out to FanucWorld for high-quality Fanuc replacement parts, including Fanuc controls, PCBs, and more. Our team of experts is dedicated to keeping your CNC machines running at peak performance with the largest inventory of Fanuc parts in the industry.