Coast to stop is a braking method used in variable frequency drives (VFDs) and motor controllers. It involves gradually reducing the frequency and voltage applied to the motor, allowing it to decelerate naturally until it comes to a complete stop.

Key characteristics of coast to stop:

• No external braking: Unlike regenerative braking or dynamic braking, coast to stop doesn't require additional braking mechanisms.
• Gentler deceleration: It provides a smoother and less abrupt stop compared to methods that use active braking.
• Energy dissipation: The kinetic energy of the motor is dissipated as heat during the deceleration process.
• Suitable for low-inertia loads: Coast to stop is often used for applications with relatively low-inertia loads, where a gradual stop is acceptable.

When to use coast to stop:

• Applications where a gentle stop is desired: For example, in conveyor systems or machinery that requires smooth transitions.
• Low-inertia loads: When the load being driven has a relatively low mass and rotational inertia.
• Energy efficiency: Coast to stop can be more energy-efficient than braking methods that require external resistance or regenerative braking.

Note: While coast to stop is a common method, it may not be suitable for all applications. In some cases, more aggressive braking methods like regenerative braking or dynamic braking may be necessary to achieve a faster or more controlled stop.