Machine safety - SmartRelay 3 system

Machines can pose significant hazards:

  • Cuts
  • Burns
  • Electric shocks
  • Laser radiation
  • Crushing

For safety reasons, only qualified people should therefore be allowed to operate hazardous machines. Unauthorised persons must not be able to put hazardous machines into operation.

An option to switch off the machine without authorised identification media further increases operational safety.

DANGER

danger

Risk of injury due to incorrect programming

The SREL3 ADV system is not suitable as a sole disconnecting device. A contactor activated via the controller must never be the only means to switch off a machine.

  1. Use the SREL3 ADV system as an additional disconnecting device only, not as the sole one.
  2. Use the actuated contactor in a series circuit with the machine's emergency stop switch only.

The SREL3 ADV system provides effective protection to prevent unauthorised persons from putting dangerous machines into operation and injuring themselves. The reader is fitted to the machine requiring protection and connected to the controller. The relay in the controller does not switch until an authorised identification medium has been activated on the reader, thus unblocking the power supply to the machine by switching the contactor. Only then can the machine be switched on at the safety switch. There are two options for installing the reader:

  • The reader is fitted into the machine housing. This variant is hidden from view and offers effective protection against the weather, dirt, fluids and mechanical impacts, depending on the machine housing.
  • The reader is fitted on or next to the machine housing. This variant is visible on the outside and makes it easier for users to place their identification medium onto the reader. The read range is better compared to a reader fitted inside a (metal) housing. The protective housing (SREL2.COVER1) ensures protection against the weather, dirt, liquids and slight mechanical impacts.

No-one can manipulate the data since communication is secured from the reader to the controller and to LSM. When the data reach the controller, the controller evaluates them. If there is a virtual network and connection to LSM (Ethernet), the latest information is retrieved using the identification medium; if not, the system used the last status saved internally. Depending on the result of the evaluation, the controller triggers the required action, such as actuate a relay.

The machine can only be put into operation if an identification medium is used on the reader. In the event of damage, the access list (for ZK variants only) will allow management to identify exactly who operated the machine last and take appropriate measures.

The controller can be powered either via an external power supply unit or via the network line. The controller, in turn, can power the reader. If the voltage drop is too great, the reader can also be supplied by an external power supply unit (see External power supply).

See Connecting one or more readers on wiring.