Right procedure to change a bit on a spindle during a job?

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PS:

Quickly searched it for you :

1. Emergency Stop circuit on VFD ← Here it is

2. Risks from rotating parts and flying debris:

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… the spindle manual also says:

5.2 Risks from rotating parts and flying debris

Use machine encapsulation!

The high speed of tools up to 24,000 rpm poses a risk of injury from flying chips or the tool bursting. Fragments reach high flight speeds and can sometimes cause serious injuries. A separating protective device (machine encapsulation) must therefore be used that protects against flying chips and debris and also has a safety switch that disconnects the frequency converter or the motor spindle from the power supply on all poles(¹) as long as the encapsulation is not closed.

– Source: Mechatron HFS Series High-Frequency Spindle Operating Manual

That is why ISO 13849 Safety relays like the Omron G9SE (datasheet) have an input for a sensor switch on the door of the enclosure of a CNC machine, which signals him someone opened the door, which allows, if VFD is configured appropriately, to decelerate spindle immediately.

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¹) by ensuring “Safe Torque Off (STO)” mode on the VFD