Parker EME
Compax3 device description
192-120114 N5 C3I22T11 June 2008 87
3.11 Compax3M with safety option S1: Safe torque off
In this chapter you can read about:
General Description............................................................................................................87
STO function on the Compax3M ........................................................................................90
Compax3M STO application description ............................................................................93
STO function test................................................................................................................98
3.11.1. General Description
In this chapter you can read about:
Important terms and explanations ......................................................................................87
Intended use.......................................................................................................................88
Advantages of using the "safe torque off" safety function. .................................................89
The present documentation assumes a basic knowledge of our drive controllers as
well as an understanding of safety-oriented machine design. References to stan-
dards and other regulations are only rudimentarily expressed.
For complementary information, we recommend the respective technical literature,
e.g.:
BIA Report 6/97 and BIA Report 5/2003 (Information issued by the german go-
vernment safety organization)
Download under: http://www.hvbg.de/d/bia/pub/rep/index.html
http://www.hvbg.de/d/bia/pub/rep/index.html
3.11.1.1 Important terms and explanations
Term Explanation
Safety category 3 according to
EN 954-1 or EN ISO 13849-1:2007
Definition according to standard:
Circuit with safety function against individual faults
Some, but not all faults are detected.
An accumulation of faults may lead to a loss of the safety function.
The remaining risk is accepted.
The determination of the safety category required for an application (risk analysis) lies within the
responsibility of the machine manufacturer.
It can take place according to the method described in EN ISO 13849-1:2007, 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
1037, paragraph 4.1.
The drive is not to be able to produce a torque and thus dangerous movements (see EN 1037,
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 inhibitor
Safe blocking of the power semiconductor control.
With the aid of this function, you can obtain a "safe torque off".
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