Switch assembly with drive system

A switch assembly, the switch assembly comprising:

• a switch;
• and
• a servo drive system for driving the switch, the servo drive system comprising:
• a drive shaft connecting the servo drive system to the switch;
• a motor configured to drive the switch;
• a power section configured to supply power to the motor;
• a feedback system, which is configured to:
• determine at least two values for an absolute position of the drive shaft generate a feedback signal on the basis of the at least two values;
• and
• a control unit which is a programmable safety controller and is configured to:
• control the power section depending on at least one desired value;
• influence an operation of the motor depending on the feedback signal;
• and
• identify the presence of at least one safety-relevant event and, in the case of identifying the presence of the safety-relevant event, to transmit at least one control signal to the power section,
• wherein the power section is configured to initiate or carry out at least one safety measure depending on the control signal,
• wherein the control unit comprises a first processor unit and a second processor unit,
• wherein the control unit is further configured to run a program in order to implement a switching command for the switch,
• wherein the first processor unit and the second processor unit are configured to run the program in parallel,
• wherein the control unit is further configured to carry out at least one reconciliation between the first processor unit and the second processor unit whilst the program is being run,
• wherein the control unit is further configured to initiate a further safety measure depending on a result of the at least one reconciliation, and
• wherein the further safety measure comprises:
• a safe stopping of the motor,
• a blocking or shutdown of the power section, or
• a tripping of a circuit breaker that is configured to connect or to disconnect equipment to a power network.