What is safe torque off function?

What is safe torque off function?

Safe Torque Off is a function that prevents the inverter from generating torque in the motor. It ensures that no torque generating energy continues to act on the motor and that the motor cannot be re-started until the STO is removed.

What is VFD safe torque off?

Safe Torque Off, known as STO for short is a safety feature on newer VFDs that turns off power on the VFD output to prevent the motor from producing torque. STO is considered an emergency stop method that will cause the motor controlled by the VFD to coast to a stop.

What is sto in electrical?

The “Safe Torque Off” function, better known as STO function, is a basic safety function that can be integrated in motor drives. It mainly prevents the drives from generating torque on the motor as well as the unintentional on unexpected starting, as long as the STO function is enabled.

What is an STO switch?

The STO function is the most basic drive-integrated safety function. It ensures that no torque-generating energy can continue to be applied to a motor and prevents unintentional starting.

What is Coast stop?

Coast stop is a braking method in which the motor drive shuts off the voltage to a motor, allowing the motor to coast to a stop. When the coast stop method is used, the drive does not have any control of the motor after the stop command is entered.

What is a safe off?

The DriveGuard Safe-Off Option Board: • Is designed to help safely remove power from the gate firing circuits of the drive’s output power devices (IGBT’s). This helps prevent the drive’s output power devices from switching in the pattern necessary to generate AC power to the motor.

When should I use a safety relay?

Safety Relays are devices that implement safety functions. In the event of a hazard, a safety relay must work to reduce risk to an acceptable level. The safety relay must initiate a safe and reliable response as well as monitor the integrity of its function.

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What is the purpose of safe torque off?

Safe Torque Off or STO is a basic drive integrated safety feature available in most mid to large size digital servo drives AMC manufactures. STO is essential to making it safe to clear blockages from your servo motor driven system or repair damage without fear of unexpected motor restart. In the early development…

What is safe torque off ( Sto ) wiring terminals?

Example of STO Wiring Terminals What Exactly is Safe Torque Off? Safe Torque Off, known as STO for short is a safety feature on newer VFDs that turns off power on the VFD output to prevent the motor from producing torque. This is done through the VFD’s hardware to ensure fault tolerance.

What does safe torque off ( Sto ) mean on Keb?

What this functional description means, is that a 2-channel safety-rated circuit is implemented inside of KEB Variable Frequency Drives (VFD) products. When 1 of these 2 channels is disconnected, lost, or opened, the drive will immediately remove modulation and electrical supply to the motor.

Why is there no torque on a VFD?

Since the power device cannot turn on there is no current to the motor, so no torque is produced by the motor. However, it is important to note that the output circuit of a VFD is comprised of solid-state components and the circuit will not physically open, so voltage may still be present at the output terminals.