Safety Functions; General Information; The Different Safety Functions; Safety Function States - Danfoss Vacon OPTEA Operating Manual

VACON® NXP Advanced Safety Options
Operating Guide

6 Safety Functions

6.1 General Information

6.1.1 The Different Safety Functions

The safety functions of the Advanced safety option board fulfill the corresponding requirements of the standard EN IEC 61800-5-2.
The standard EN IEC 61800-5-2 does not define the SQS safety function, but the function can be parameterized to behave like
STO(+SBC), SS1 or SS2. These functions fulfill the requirements of the standard.
The safety functions are divided into two categories: the safe stopping functions and the safe monitoring functions. The safe stop-
ping functions start and monitor the stopping of the motor, the safe monitoring functions monitor the speed, the position, or the
acceleration of the motor.
The safe stopping functions
• the STO function
• the SBC function
• the SS1 function
• the SS2 function
• the SOS function
• the SQS function
The safe monitoring functions
• the SLS function
• the SMS function
• the SSR function
• the SSM function
The SQS function can be used in STO, SS1 or SS2 modes. In this manual, these modes are referred to as SQS-STO, SQS-SS1, and SQS-
SS2.
Safe monitoring functions
Safety function
request
Acknowledgement
Active, Reached
Illustration 21: The Simplified Relations Between the Safety Functions

6.1.2 Safety Function States

The safety functions can be in three different states: inactive, active, and reached. The safety functions that are not requested or
have been acknowledged after their execution are inactive. Inactive safety functions are not executed and they do not do any moni-
toring. The states active and reached are shown with signals.
An inactive safety function becomes active when it receives a request. An active safe stopping function becomes reached when the
function is completed. An active safe monitoring function becomes reached when the monitored values are within the monitoring
limits.
Danfoss A/S © 2021.06
SLS
Safety function
request
Acknowledgement
SSR
Limit violation
SMS
SSM
Safe stopping functions
Limit violation
SS1
SS2
SQS
SOS
Active, Reached
AQ319736045637en-000101 / DPD01798 | 57
Safety Functions
STO
SBC
Reset