Rockwell Automation Publication 442G-DM001A-EN-P - September 2015
1
Demo
Multifunctional Access Box and Guard Locking
with Time Delay Safety Relay
442G-MABR-URM-C03
Purpose
This demo is designed to demonstrate the features of a Multifunctional Access
Box and the Guard Locking with Time Delay (GLT relay) Safety Relay.
Product Overview
The multifunctional access box is a guard locking interlock with integrated
controls that helps facilitate access to a safeguarded area. The customer
determines the functions of the integrated push buttons and the functions can
vary depending on the application. For this demo, a push button has been
assigned as an “Unlock Request” and the other one as a “Reset and Lock
Request.”
You press the Unlock Request button to request access to the safeguarded area.
The control system (GLT relay) shuts down the hazard and unlocks the guard
door after a time delay. Then you are allowed to open the guard door and enter
the safeguarded area. Upon exiting the safeguarded area, you close the door and
press the Reset and Lock Request button to lock the guard door and reset the
safety system.
Guard Locking with Time-delay (GLT relay) Safety Relay
The GLT relay safety relay is designed to use time-delay outputs for use in
Stop Category 1 applications and to unlock a guard door when the time
expires. The relay also provides a lock command to lock a guard door before the
starting of the hazard. In this demo, there is a three-second delay between the
time that the GLT relay receives the Unlock Request and the time that the
relay issues the Unlock command to the access box.
