Rockwell Automation Publication 442G-DM001A-EN-P - September 2015
3
Multifunctional Access Box and Guard Locking with Time Delay Safety Relay
Note:
If the PWR/Fault status indicator on the relay blinks red, push the blue
button on the access box to reset the relay.
Note:
If the DIA status indicator on the access box is red, clear the fault by
pressing the green power reset button (found next to the circuit breaker) for at
least three seconds.
3.
To request access to the hazardous area, press the yellow push button.
The GLT relay immediately turns its outputs OFF to shut down the
hazard and after three seconds, unlocks the guard door. The yellow
push button on the access box turns OFF.
4.
Open the guard door.
The blue push button on the access box turns OFF.
Note:
The yellow push button is illuminated when the door is “closed and
locked (diagnostic signal OL is on).” The blue push button is illuminated when
the door is “closed and the bolt actuator is inserted in the lock module” (and
therefore, ready to be locked (diagnostic signal OT is on)). See Diagnostics for
more information about the access box diagnostic signals.
5.
Close the guard door.
The blue push button does not turn on again until you rotate the
handle to insert the bolt into the lock module.
6.
To reset the safety system, press the blue push button.
The yellow push button turns on again, which indicates the device is
closed and locked.
E-stop
The GLT relay can be operated with other safety relays in the Guardmaster
Safety Relay (GSR) family, by use of the single-wire safety (SWS) connection.
When the GLT relay receives a single-wire safety signal from another GSR
relay, the GLT relay issues an Unlock command.
In this demo, the E-stop of the access box is connected to the GSR single input
(SI) safety relay. The single-wire safety (SWS) output of the SI is connected to
the SWS input of the GLT relay. When the E-stop is pressed, the GLT relay
immediately turns its outputs OFF to shut down the hazard and after three
seconds, unlocks the guard door.
7.
With the door closed and locked and the outputs ON, press the E-stop.
This action turns the outputs of the SI OFF. The single wire safety of
the SI turns OFF, which turns the outputs of the GLT relay off. The
GLT relay cannot be reset until the E-stop is released.
8.
Release the E-stop. To reset the GLT relay, press the blue push button.
IMPORTANT
The guard door must be in the open position to clear a latching fault.