During the safety loop fault procedure, when should the Master Controller be set to 'coast'?

In the context of the safety loop fault procedure, setting the Master Controller to 'coast' is essential when the Deadman's device is not operating correctly. The Deadman's device is a critical safety feature designed to ensure that the operation halts or is controlled if the operator is incapacitated or unable to provide input. When this device fails, it poses a significant safety risk, as there might be a potential for unexpected movement or operation of equipment that could lead to accidents.

By setting the Master Controller to 'coast,' you effectively disengage the control mechanisms that could cause the equipment to operate in an unsafe manner while allowing the system to maintain its current speed without additional input. This action serves as a safety precaution to prevent accidents and ensure that the equipment does not move unexpectedly due to a malfunction in the Deadman's device.

In contrast, the other scenarios mentioned do not warrant a 'coast' setting. The oversight of the Automatic Coupler, for instance, may involve different safety protocols not primarily focused on the Deadman's device. Similarly, at the start of the procedure or when the Trip Indicator Light is on, there may be standard operational protocols that should be followed, which do not directly relate to the safe handling of the Master Controller in response