Safety is Pilz's core competitive advantage, and effective and reliable safety technologies are the foundation for ensuring the safety of equipment and personnel. Pilz's safety-driven technologies help customers improve production efficiency while ensuring safe production.
Wide range of applications
In any industry, safety is the top priority. Pilz's safety drive technology has been successfully applied in industries such as automotive, stamping and metal processing, packaging, power, cable cars, and amusement parks.
Driving principle of integrated security functions
Integrated safety-based drives integrate safety functions (corresponding to safety logic in traditional relay control systems) into the drive control system, essentially integrating safety logic into the NC (Non-Controlled Controller). Simultaneously, safety bus technology integrates control and safety communication. When the drive reaches certain set safety limits (such as maximum speed, position, or torque), relevant safety function signals directly act on the power semiconductor devices in the drive controller through corresponding channels, causing the drive to enter a safety mode. This allows the drive system to perform its tasks while simultaneously prioritizing safety, resulting in a safer, faster, and more efficient drive.
How much do you know about integrated security features?
According to IEC 61800-5-2, safety integrated functions include: Safety Torque Cut-off (STO), Safety Stop 1 (SSI), Safety Brake Control (SBC), Safety Stop 2 (SS2), Safety Speed Limit (SLS), Safety Position Limit (SLP), Safety Torque Limit (SLT), Safety Stop on Operation (SOS), Safety Direction (SDI), Safety Increment Limit (SLI), Safety Speed Monitoring (SSM), and Safety Acceleration Limit (SLA).
These safety functions are either directly embedded in the drive terminal and implemented by the driver, or indirectly implemented by the safety-integrated driver by feeding back the signals from the drive terminal to the controller.
1. Safety Torque Cut-off (STO)
By monitoring the output torque of the motor and integrating this function as a standard into the motor driver, and by constantly monitoring the operating status of the motor, the safety function is activated to cut off the power supply to the power section when a certain function of the motor fails or a dangerous situation occurs, so that the motor can smoothly transition to a stop state and ensure personal safety. At the same time, STO also prevents personal injury or machine damage caused by accidental restart of the driver.
The basis for achieving this function is that after STO is activated, the power supply to the power section can be cut off through a pulse signal via a specified shutdown path, and this function is integrated into the motor drive module.
2. Safe Parking 1 (SS1)
This function is used to activate the motor deceleration and stop function, and after a certain delay, it triggers the safety torque cut-off function, thereby ensuring a safe stop of the drive. Additionally, the safety torque cut-off function will be activated through this function in the event of any safety fault.
It should be noted that the Safe Stop 1 function can only be implemented in conjunction with the Safe Torque Cut-off function, and the STO or SBC function will be automatically activated after a certain time delay. If SS1 is canceled within the specified time delay, the STO or SSI function will still be automatically activated after the delay is reached, and will be automatically shut down randomly.
3. Safety Brake Control (SBC)
When the safety torque cut-off function is activated, or when any safety monitoring function responds, the drive will enter the safety brake control function. This function is executed through dual channels, and the brake status is monitored during the process.
4. Safe Operation Shutdown (SOS)
When the motor is stationary, the system monitors its position using closed-loop position or speed control to ensure it remains in a safe stopping state and maintains the power required by the external load. For example, when a heavy object is suspended in the air at a certain position under a tower crane, the motor needs to provide a constant torque to ensure safety.
5. Safe Speed Limit (SLS)
A certain speed value is set, and when the motor speed exceeds this set value, the corresponding safety stop function response is triggered, thereby activating the safety integrated drive function response.
6. Safe Parking 2 (SS2)
When the motor reaches a certain set speed limit, the motor deceleration function is activated, and the motor is monitored during the deceleration process. At the same time, a timer is started, and the SOS function is triggered when the motor stops or after a specified delay.
7. Safety Acceleration Limit (SLA)
The safety acceleration setting monitors the acceleration and deceleration process of the electric motor to prevent the acceleration from exceeding a given safety value, thereby reducing mechanical vibration, avoiding mechanical collisions, and preventing accidents.
8. Safe Position Limitation (SLP)
During machine operation, the absolute position of the machine's movement is monitored to prevent the movement from exceeding the given position limits, thereby reducing the occurrence of accidents such as tool collisions, design and mechanical collisions.
9. Safety Direction (SDI)
This ensures that the motor can only run in a specific direction and cannot reverse due to human error, thereby effectively protecting mechanical safety and preventing accidents.
Based on the safety requirements of motion control, Pilz's PMCprotego DS series servo drives integrate servo safety functions, which can provide timely feedback under various abnormal conditions and further control the motor's stop, speed, and position to achieve the requirements of safe drive.
STO, SS1, and SBC, as the basic functions of the drive, are directly integrated into the drive controller, which directly controls the motor to achieve safety functions.
Safety functions such as SS2, SLS, SLA, SLP, SOS, and SDI can be abstracted into safety logic and then integrated into the driver. By monitoring the machine's operating status during motor operation, the safety signals and related data corresponding to each safety function are periodically fed back to the safety integration system. Finally, the driver is controlled through its built-in safety integration functions (STO, SSI, and SBC) to achieve functional safety.
As a safety ambassador in the field of automation, Pilz is committed to bringing users the most suitable solutions.
Pilz China
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