General vacon • 11
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
2
Safe Torque Off (STO)
The hardware based 'Safe Torque Off' safety function prevents the drive from generating torque on
the motor shaft. The STO safety function has been designed for use in accordance with the following
standards:
• EN 61800-5-2 Safe Torque Off (STO) SIL3
• EN ISO 13849-1 PL"e" Category 3
• EN 62061: SILCL3
• IEC 61508: SIL3
• The function also corresponds to an uncontrolled stop in accordance with the stop category 0, EN
60204-1.
• The STO safety function has been certified by TÜV Rheinland
NOTE! The STO function is not the same as a prevention of unexpected start-up function. For fulfilling those
requirements, additional external components are required according to appropriate standards and applica-
tion requirements. Required external components may be for example:
• Appropriate lockable switch
• A safety relay providing a reset function
NOTE! The safety functions of OPTBJ do not comply with Emergency Switching Off according to EN 60204-1.
NOTE! Do not use the STO function as a standard stop function of the drive.
NOTE! In an IGBT fault situation, the shaft of a permanent magnet motor can rotate up to 180 degrees around
the pole of the motor.
NOTE! If the pollution degree 2 cannot be guaranteed, use the IP54 protection class.
Safe Stop 1 (SS1)
The SS1 safety function is realized in compliance with type C of the drives safety standard EN 61800-
5-2 (Type C: "The PDS(SR) initiates the motor deceleration and initiates the STO function after an
application specific time delay").
The SS1 safety function has been designed for use in accordance with the following standards:
• EN 61800-5-2 Safe Stop 1 (SS1) SIL2
• EN ISO 13849-1 PL"d" Category 3
• EN 62061: SILCL2
• IEC 61508: SIL2
• The function also corresponds to a controlled stop in accordance with the stop cat. 1, EN 60204-1.
Motor Thermistor Over temperature protection (according to ATEX)
Overtemperature detection using thermistor. It can be used as a tripping device for ATEX certified
motors.
The thermistor tripping function is certified by VTT* according to ATEX directive 94/9/EC.
All safety functions of the OPTBJ board are described in this manual.
* VTT = Technical Research Centre of Finland
2.1 References
VACON
®
100 family Installation and Application manuals are downloadable at https://www.dan-
foss.com/en/service-and-support/.
CAUTION! The OPTBJ board and its safety functions do not electrically isolate the
drive output from the mains supply. If electrical work is to be carried out on the
drive, the motor or the motor cabling, the drive has to be completely isolated
from the mains supply, for example, using an external supply disconnecting
switch. See, for example, EN60204-1 Chapter 6.5.
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