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Do Delta servo drives meet all safety requirements?
Below is an overview of all safety functions of the A3 series servos that comply with the IEC 61508, SIL 3 safety standards.
| Safety Function | Function | Application |
|---|---|---|
| Safe Torque Off (STO) | Disables the output power of the servo drive. The motor no longer delivers torque. | Maintenance, emergency stop, prevention of unintended startup |
| Safe Stop 1 (SS1) | The motor decelerates in a controlled manner to a standstill within a set time or ramp, and then automatically switches to STO. | High-speed applications or applications with a risk of machine damage |
| Safe Stop 2 (SS2) | The motor decelerates in a controlled manner to a standstill, but motor torque remains available to hold position. | Precise positioning and controlled stopping |
| Safe Operating Stop (SOS) | Holds the motor stationary with active control, ensuring position is maintained and a quick restart is possible. | Robot positioning and high-precision applications |
| Safe Limited Speed (SLS) | Monitors motor speed and intervenes if the set limit is exceeded (stop or controlled deceleration). | Safe operation during runtime, for example during manual interaction |
| Safe Maximum Speed (SMS) | Limits the maximum motor speed to a fixed safe value. | Applications where speed must be structurally limited |
| Safe Speed Monitoring (SSM) | Continuously monitors whether the motor speed remains within a safe limit. | Situations where operators must be able to approach safely |
| Safe Incremental Movement (SIM) | Limits the motor’s movement to a predefined range or path. | Controlled movement within a limited space |
| Safe Direction (SDI) | Limits movement to a single safe direction and prevents unwanted reverse movement. | Vertical axes or applications with a risk of falling |
| Safe Limited Position (SLP) | Defines and monitors a safe working area for the motor position. | Robots, axes, and lifting platforms |
| Safe Brake Control (SBC) | Controls the mechanical brake via a safe output signal. | Applications where a brake must be actively controlled |