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For all SIMODRIVE devices the basic principle of the safety–related circuit is the same. However, the different devices can have different terminal designations. The following circuit examples can be used, in an adapted form, for all SIMODRIVE infeeds and drives, including the 6SN1145-1BA02-0CA1. The specifications to prove the Performance Level can be kept. For reasons of transparency, in the following examples, only the safety–related terminals are connected. To move the drives, all of the necessary enable terminals must be supplied. In the following examples, power contactors with mirror contacts as well as contactor relays with positively–driven contacts are used. For reasons of simplicity, the mirror contacts of the power contactors are designated as standard as positively–driven contacts.
The supplementary safety function EMERGENCY STOP results in the drive being safely stopped in a controlled fashion. After the stopping time has expired, the drive is safely switched into a no–torque condition.The EMERGENCY STOP push button is actuated 1x per month. . As a result of the risk assessment, the required Performance Level for the safety function is defined to be PLr = d.
The instantaneous contacts of safety relay –A1 are opened. The axis–specific control enable RF (terminal 65) is switched to low. The drive is immediately braked to zero speed at the current limit. After the delay time of –A1 has expired, safety relay –K1 and line contactor –K2 are switched into a no–voltage state. The NO contacts open, and the motor is disconnected from the torque–generating power supply through two channels. This behavior corresponds to stop Category 1, according to EN 60204–1:2006. The safety functions are initiated by the EMERGENCY STOP pushbutton, which can be released by turning, and which is connected through two channels. This has positively opening contacts. Fault exclusion is assumed for the positively opening contacts as well as for the mechanical system of the EMERGENCY STOP pushbutton. An accumulation of faults between two consecutive actuations of the EMERGENCY STOP pushbutton can result in the safety function being lost. This behavior corresponds to Category 3.
The RESPOND subsystem has a two channel structure. The first channel is implemented using safety relay –K1. The line contactor in the line infeed forms the second channel. Both channels are simultaneously controlled from safety relay –A1. The positively opening NC contacts of the contactor and relay are tested as feedback signal contacts by –A1 at each start. An accumulation of faults between two consecutive actuations of the EMERGENCY STOP pushbutton is not detected: Basic as well as well–proven safety principles – such as the requirements regarding Category B – are maintained. Protective circuits are provided. When a component fails, the safety function is always maintained. The failure is detected. This structure corresponds to Category 3, according to EN 13849–1:2008.
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