3.1.10 Control system requirements
If an appliance is equipped with safety and controlling devices, the functioning of the safety devices must not be overruled by the controlling devices (see IEC 61508 [16] for control device requirements).
All parts of appliances that are set or adjusted at the stage of manufacture and which should not be manipulated by the user or the installer must be appropriately protected.
Levers and other controlling and setting devices must be clearly marked and give appropriate instructions to prevent any error in handling. Their design must preclude accidental manipulation.
The surface temperature of knobs and levers of appliances must not present a danger to the user.
Other areas that need to be addressed in the design of the control system are:
- Safety and reliability of control systems;
- Control devices;
- Starting;
- Stopping;
- Selection of control or operating modes;
- Failure of the power supply.