Parker EME Compax3 device description192-120114 N5 C3I22T11 June 2008 873.11 Compax3M with safety option S1: Safe torque offIn this chapter you can read about:General Description............................................................................................................87STO function on the Compax3M ........................................................................................90Compax3M STO application description ............................................................................93STO function test................................................................................................................983.11.1. General DescriptionIn this chapter you can read about:Important terms and explanations ......................................................................................87Intended use.......................................................................................................................88Advantages of using the "safe torque off" safety function. .................................................89The present documentation assumes a basic knowledge of our drive controllers aswell 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.htmlhttp://www.hvbg.de/d/bia/pub/rep/index.html3.11.1.1 Important terms and explanationsTerm ExplanationSafety category 3 according toEN 954-1 or EN ISO 13849-1:2007Definition according to standard:Circuit with safety function against individual faultsSome, 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 theresponsibility 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 offWith the "safe torque off", the energy supply of the drive is safely interrupted according to EN1037, 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".
