Aisle Access in Automated Storage and Retrieval Systems
Automated storage and retrieval systems (ASRS) often span across many aisles, have multiple access points, and are likely to have cranes to retrieve and store products. In some regions, such systems need to conform with EN 528, a safety standard for rail dependent storage and retrieval equipment, which includes a range of requirements with respect to self-closing guards, mode selection and key dependency.
This example discusses a warehouse facility of a car manufacturer used to store cylinder engines.
The challenge
The system needs to include a key for external mode selection between automatic and manual mode; the guard needs to close after personnel enter; to operate the crane from within the aisle, the on-board control station needs to be in manual mode. Moreover, in this specific case, the customer also wants protection for personnel entering the area, preventing unexpected start-up of the machine.
The solution – amGardpro with proNet
On the self-closing guard there is an amGardpro interlock with a proNet module that communicates over PROFINET. The unit has a key-operated switch for mode selection and a control pod with pushbuttons. Personnel entering the aisle can apply a personal padlock on the padlockable dustcover.
Inside the aisle, an internal key-operated switch for mode selection enables manual crane operation. When the work is completed, the operator returns the mode selection device to automatic mode, removes the key, and exits the aisle. The interlock has also an escape release function in case personnel become trapped.
When the key is returned, automatic mode can be restored. The machine can then be reset with appropriate procedures.
Step by step process
Why amGardpro?
Fortress devices may be used as part of a wider system to meet the requirements of EN 528. In addition, the amGardpro interlock used in this case:
– Enables easy integration within the existing network thanks to the proNet module
– Provides prevention against unexpected start-up
– Protects personnel entering the area thanks to the padlockable dustcover
– Through the escape release function allows personnel to leave the area if they become trapped
Additional Considerations
This solution successfully resolved a challenge for a specific customer. Fortress can accommodate alternative setups and/or multi-range options. Share your application details with us so we can design a bespoke solution to meet your needs.
