Introduction
1.4 Armature circuit with one switching device
Application document for functional safety STO, SS1 (ISO 13849-1)
14 Compact User Manual, 09/2016, A5E34871844AM
The power contactors and circuit breakers that have been tested are listed in Recommended
circuit breakers and power contactors (Page 81).
are, according to EN ISO 13849-2: 2013-02 considered as proven
components. As a consequence, two NC contacts of each circuit breaker are connected in
series to provide a feedback signal, which must be integrated in the feedback circuit of the
safety relay
must have mirror contacts or positively-driven contacts to be considered
as proven component in compliance with EN
ISO 13849-2: 2013-02; these contacts must be
integrated in the feedback circuit of the safety relay.
Armature circuit with one switching device
The armature circuit power supply is realized with only one circuit breaker or one power
contactor. The E-Stop for the power unit is controlled in parallel.
After STO has been selected, the E-Stop function of the drive is activated using the safety
relay (supply at terminal 105 is disconnected). When setting p51616=0, using Alpha-W
pulses, the SINAMICS DCM reduces the armature current - and then inhibits the firing
pulses and also interrupts the main contactor control (terminals 109-110). The active E-Stop
state is integrated in the feedback circuit of the safety relay using digital output (DO3) via a
relay.
Via the expansion device, independent of the SINAMICS DCM state, a safety-related
coupling relay is switched, which immediately opens the circuit breaker with the undervoltage
coil - or for a power contactor, disconnects the solenoid.
If STO is not selected, then the circuit breaker or power contactor is switched with a
positively-driven interface relay from the SINAMICS DCM.
Armature circuit with two switching devices
The armature circuit power supply is realized with two circuit breakers or power contactors
connected in series. The E-Stop for the power unit is also controlled.
This solution essentially differs as a second switching device is installed in the amateur
circuit.
After STO has been selected, the E-Stop function of the drive is activated using the safety
relay (supply at terminal 105 is disconnected). When setting p51616=0, using Alpha-W
pulses, the SINAMICS DCM reduces the armature current - and then inhibits the firing
pulses and also interrupts the main contactor control (terminals 109-110). The active E-Stop
state is integrated in the feedback circuit of the safety relay using digital output (DO3) via a
relay.
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