192-011006N8 PSD1 Installation Guide
192-011006N8 2019-07
09.10.19 09:27
67 (109)
In this chapter you can read about:
•
General Description .................................................................................................................. 67
•
STO Operating Principle ........................................................................................................... 69
•
Notes on the STO function ....................................................................................................... 73
•
Conditions of utilization for the STO function ............................................................................ 73
•
STO delay times ....................................................................................................................... 74
•
STO Application examples ....................................................................................................... 75
•
STO function test ...................................................................................................................... 78
•
Technical data STO .................................................................................................................. 80
6.1
General Description
In this chapter you can read about:
•
Important Technical Terms and Explanations ........................................................................... 67
•
Applications in accordance with the regulations ........................................................................ 68
•
Qualified Personnel .................................................................................................................. 68
•
Advantages of using the "safe torque off" safety function" STO ................................................ 68
The following documentation is meant to provide the basic information concerning
our drive controller and an understanding about the advanced, safety oriented
machine construction. References to standards or other regulations are made in a
general overview manner. The specific standards or regulations for your installation
will vary depending upon the equipment employed and the specifics of your
application.
For complementary information, we recommend the respective technical literature.
6.1.1.
Important Technical Terms and Explanations
Term
Explanation
Safety category 3 in
accordance with EN ISO
13849-1
Definition according to standard:
Circuit with built-in protective functions for individual fault conditions.
Some, but not all faults will be recognized.
The frequent occurrence of fault conditions can lead to a loss of the safety functions.
The remainder of the risk must be understood and accepted.
The determination for the application of the appropriate safety category requirements,
(risk analysis), lies with the installer and operator of the equipment.
It can take place according to the method described in EN ISO 13849-1, appendix A.
"Safe torque off"
or abbreviated:
STO=Safe torque off
With the "safe torque off", the energy supply of the drive is safely interrupted according
to EN 14118, paragraph 4.1.
The drive is not to be able to produce a torque and thus dangerous movements (see EN
14118, paragraph 5.3.1.3).
The standstill position must not be monitored.
If an external force effect, e.g. a drop of hanging loads, is possible with the "safe torque
off", additional measures to safely prevent those must be provided (e.g. additional
mechanical brakes).
The following measures are appropriate for a "safe torque off":
Contactor between mains and drive system (mains contactor)
Contactor between power section and motor (motor contactor)
Safe blocking of the power semiconductor control (start inhibitor)
Start-Up Lockout
Safe blocking of the power semiconductor control.
With the aid of this function, you can obtain a "safe torque off".
Stop categories according to EN60204-1 (9.2.2)
6. Safe Torque Off (STO) with PSD1
