Speed
Violation
Logical level
Logical level
SLS Request
SLS 1 Limit
SLS 2 Limit
SLS 3 Limit
SQS Active
& STO Active
SQS Reached
& STO Reached
t
Illustration 54: An SLS Ramp Violation. The SQS-STO Function as a Violation Response.
6.3.3 SMS - Safe Maximum Speed
6.3.3.1 Introduction to the SMS Function
The Safe Maximum Speed (SMS) safety function monitors that the motor speed does not exceed the parameterized speed limit. The
limit can be set independently for both the rotation directions of the motor.
The violation response is the SQS function.
The parameters of the SMS safety function are described in 8.9 SMS Parameters.
6.3.3.2 The Maximum Speed Monitoring
The maximum speed monitoring starts immediately when the SMS function is requested and becomes active. If the limits are not
violated, the function stays in the Reached state.
AQ319736045637en-000101 / DPD0179896 | Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide