Eaton Logo

How do you connect Emergency Stop pushbuttons in a SmartWire-DT network?

The emergency stop of motor starters with the SmartWire-DT contactor module DIL-SWD-32 can be accomplished with the
interruption of the 24Vdc control voltage at the SmartWire-DT gateway or powerfeed module.
 
Safety Category 1:
The emergency stop of motor starters with the SWD contactor module DIL-SWD-32 can be accomplished with the interruption
of the 24Vdc control voltage at the SWD gateway or SWD powerfeed module (AUX). Using the opening contacts of an
emergency switch or opening output of a safety relay (e.g. ESR5) to interrupt this control voltage conforms to Safety Category 1 to EN 954-1.
 
Safety Category 3:
For an increased safety level of the emergency stop one has to add one group contactor which carries the current of all motor
starters. The coil of the group contactor is controlled by the relay output of the safety relay and must also be switched off in the case of an emergency. This provides a redundancy off-switching for the motor starters. In addition to this group contactor one also has to read back the switching status of the contactors in the feedback circuit of the safety relay. Therefore the auxiliary contacts of the motor starter contactors and the group contactor have to be normally closed contacts.