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Logical level
SS1 Request
STO Reached
SS1 Reached
Reset
SS1 t1
t
SS1 Active
t
t
t
t
Illustration 40: The SS1 Signals in Zero Speed Monitoring Mode in a Violation Case. The STO Function without SBC.
6.2.4 SS2 - Safe Stop 2 and SOS - Safe Operating Stop
6.2.4.1 Introduction to the SS2 and SOS Functions
The Safe Stop 2 (SS2) safety function starts the motor deceleration and activates the SOS function.
The SS2 function can operate in one of the three monitoring modes:
Time monitoring mode
Time + zero speed monitoring mode
Time + zero speed + ramp monitoring mode
The SS2 function can activate the SOS function:
When an application-specific time delay has passed (Time monitoring)
When the speed reaches zero speed (Zero speed monitoring)
The violation response of the SS2 function is the STO(+SBC) function. During ramp down, it is possible to monitor the deceleration.
If there is a violation in the ramp monitoring of the SS2 function, or if zero speed is not reached, it activates the STO(+SBC) function
as a violation response.
The SOS safety function keeps the drive output active and monitors the positions of the motor shaft. A violation of the position
monitoring of the SOS function activates the STO(+SBC) function.
The SS2 and SOS functions fulfill the stop category 2 of the standard IEC-60204-1.
The parameters of the SS2 and SOS safety functions are described in 8.6 SS2 and SOS Parameters.
N O T I C E
The SS2 safety function can be used only with Sin/Cos encoders.
AQ319736045637en-000101 / DPD0179878 | Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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