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The STO function can be used together with the Safe Brake Control (SBC) safety function. The SBC function provides a safe output
with which it is possible to control an external brake.
The STO function fulfills the stop category 0 of the standard IEC-60204-1.
For effects of the STO function on the AC drive, see the VACON
®
NX OPTAF STO Board Manual.
Things that can activate the STO(+SBC) function:
An external request
A violation of another safety function (as SQS or as a safe stopping function violation response)
A fault detected by the internal diagnostics of the Advanced safety option board
The parameters of the STO and SBC safety functions are described in
8.4 STO and SBC Parameters.
6.2.2.2 The STO Function Used without the SBC Function
When there is an external request for the STO function, or a violation of another safe stopping function, the STO function is activa-
ted immediately.
Illustration 29: The STO Function
The STO output of the Advanced safety option board is connected to the STO option board that handles the operation of the STO
function in the drive. When the STO function is active, it disables the drive output. Then the drive cannot generate torque to the
motor shaft.
6.2.2.3 The STO Function Used with the SBC Function
When the STO function is used with the SBC function, the behavior of the STO output, the STO signals, the SBC output, and the SBC
signals depends on the values of the SBC parameters. The parameter SBC Order defines which safety function becomes active first.
The second safety function becomes active after the time that is set in SBC t1.
Speed
SBC
STO
SBC t1
t
e30bi388.10
Illustration 30: STO Behaviour with SBC Order = SBC First
AQ319736045637en-000101 / DPD0179868 | Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
Operating Guide
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