An iTNC 530 can show an Nm indication near the speed potentiometer visualization while the expected feed-percentage indication remains unchanged as the potentiometer turns. The available evidence identifies this as a display-mode selection issue, not proof that the potentiometer or machine feed control has failed.
Identify the Display-Mode Problem
Check what changes on the screen when you rotate the potentiometer. If the visualization remains in Nm and does not show the expected feed-percentage response, change the displayed mode before troubleshooting wiring, hardware, or machine parameters. Do not infer actual machine motion or override behavior from the visualization alone; verify those functions separately under the machine builder's safe operating procedure.
Change the iTNC 530 Visualization
- Place the control in manual mode.
- Press the function key associated with the display selection.
- Press the mode key.
- Select the upper or lower mode to change the displayed potentiometer information.
This sequence resolved the reported selection problem. The resulting visualization provided the required selection buttons, although its appearance did not exactly match the expected screen.
Account for Screen Differences
Use the available selection buttons as the functional verification criterion rather than requiring an identical screen layout. The evidence suggests that display appearance may vary with the control version or machine-builder customization, but it does not identify an affected software version or configuration parameter. If the buttons or modes are absent, document the current screen and contact the machine builder or the control manufacturer's official support channel.
FAQ
Why does my iTNC 530 potentiometer display show Nm instead of feed percentage?
The control is displaying a different visualization mode. In manual mode, use the function and mode keys, then select the upper or lower display mode.
Does an unchanged percentage mean the iTNC 530 potentiometer has failed?
No. The evidence confirms that changing the display selection resolved the reported issue; verify actual override operation separately before diagnosing hardware.
Why does my iTNC 530 screen look different after changing the mode?
The selection buttons can work even when the visualization is not identical. Control-version differences or machine-builder customization are possible explanations, but the available evidence does not identify a specific version or parameter.