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VACON® NXP Advanced Safety Options
Operating Guide
3 Overview of the System
3.1 Using the Advanced Safety Options
The Advanced safety option board is used to implement safety functions in accordance with the standard EN IEC 61800-5-2. The
option board handles the safe I/O and the monitoring of active safety functions. The option board does not handle the control of
the AC drive. The AC drive can be controlled, for example, with the drive application, or the external process control system can give
the speed reference to the AC drive.
The Advanced safety option board must be used with a subsystem that provides the STO function, it is not possible to use the
Advanced safety option board alone. The STO function is provided, for example, by the OPTAF STO option board. To use the safety
functions that do speed monitoring, an external speed sensor is necessary. The sensor can be a digital or an analog encoder or a
digital proximity sensor. See chapter Speed Measurement.
The Advanced safety option board can be used with the digital I/O and over safe fieldbus. Using a safe fieldbus allows you to control
more safety functions than is possible with the limited number of inputs and outputs that the Advanced safety option board has.
When using a safe fieldbus, install an option board that supports the fieldbus. See
The
Illustration 4
shows the configuration of the AC drive with the Advanced safety option board in slot C. The safe fieldbus and the
closed-loop control are optional. The possible configuration and available features can depend on other option boards and their
installation slots. For use cases with other encoder board installed in slot C, see
NCDrive
Power
Unit
Motor
Illustration 4: An example configuration of the VACON
actions are marked in gray.
The parameterization of the option board is done by selecting and editing the safety functions and features with the VACON
tool. See
5.4 Setting the Parameters
3.2 The Safe State
There must be a safe state to which the system can be set when necessary. Usually the safe state is reached when the AC drive does
not generate torque to the motor shaft. In the Advanced safety option board, this is realized by the Safe Torque Off (STO) safety
function.
In some systems, the active STO function in the AC drive does not create a safe state. It means that external forces can generate
torque to the motor shaft and cause it to rotate. To achieve the safe state in these systems, additional means are necessary. For
example, it is possible to use the STO function and a mechanical brake. The brake can be used with the Safe Brake Control (SBC)
safety function of the Advanced option board, or with another safe control system for the brake.
24 | Danfoss A/S © 2021.06
VACON
Loader
VACON
®
SLOT A
SLOT B
Basic I/O
STO
option
board
Encoder
Encoder
signals
NXP drive with the Advanced safety option board. The subsystems that handle safety
®
and chapter Parameter List.
7.1.1 Introduction to
3.6.4
Encoders.
Safe
®
Control Board
SLOT C
SLOT D
Advanced
safety
option
board
Digital
STO
I/O
Safety PLC or other safety systems
Overview of the System
PROFIsafe.
PC
Drive
SLOT E
Fieldbus
board
Safe
fieldbus
AQ319736045637en-000101 / DPD01798
Safe
®
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