Access the Main power supply panel from the Slow monitoring overview panel as shown below:
Now click on the "open panel" button to access panels for a given crate.
This opens up non-expert level TPC Crate panel. The power supply on/off capability is provided in this panel with an expert password.
From here, one can supply the expert password and access the expert panel. This is strictly expert operation. We show the panel here as an example.