Safely monitored Emergency-Stop circuits
The electronic safety relays ESR from
Moeller switch several enable current paths for direct or time-delayed
disconnection of the energy supply when the Emergency-Stop actuator is
triggered. Depending on their configuration, they can detect faults such
as cross short-circuits, earth faults or short-circuits in the Emergency-Stop
actuator circuit. These lead either to immediate disconnection or prevent
restart as long as the fault is not remedied. Safety relays for category
4 feature additional restart monitoring. The enable becomes effective
only after the On button is released. Tampering is safely avoided in this
manner!
The safety relays conform to the demands of categories 2 to 4 of the EN 954-1 depending on their type and configuration.
For applications which require more contacts, the ESR relay can be extended by the expansion module ESR4-NE which each provide up to four additional enable paths.
For processes which must be retracted or wound down and may not be directly de-energized (Stop category 1 to EN 60204-1), there are delayed safety relays ESR 4-NV available. They are suitable for time ranges up to 30 s.
