The STO function can also become active as a violation response, when the speed does not follow the set deceleration ramp (Ramp
monitoring).
The SS1 function fulfills the stop category 1 of the standard IEC-60204-1.
The parameters of the SS1 safety function are described in 8.5 SS1 Parameters.
6.2.3.2 Time Monitoring
SS1 t1
t
Speed
STO + SBC
e30bi390.10
Illustration 35: The SS1 Function in the Time Monitoring Mode
The time monitoring mode is always used when SS1 is active. In the time monitoring mode, the STO function is activated when the
time indicated by parameter SS1 t1 has elapsed. The SS1 t1 timer starts when the SS1 function starts its operation.
If the SBC function is used and the value of the parameter SBC Speed is set to above zero, the STO(+SBC) becomes active after SS1
t1, or when the speed goes below SBC Speed, whichever is valid first.
6.2.3.3 Zero Speed Monitoring
Zero speed /
SBC speed
SS1 t1
t
Illustration 36: The SS1 Function in the Time + Zero Speed Monitoring Mode
AQ319736045637en-000101 / DPD0179874 | Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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