Rockwell Automation Allen-Bradley Guardmaster 440G-LZS21SP Series - Chapter 6; Diagnosis of Switch Condition Using LED Indicators; LED Indicators During Normal Operation; LED Indicators During Power-Up Routine

Rockwell Automation Publication 440G-UM001C-EN-P - June 2019 31
Chapter 6
Diagnostics and Troubleshooting
LED Indicators during Power-
up Routine
When power is applied to the switch, the green LED indicators flash slowly
three times and then fast three times. See Tab le 1 3
for LED status at the
conclusion of the power-up routine.
LED Indicators during Normal
Operation
Tab le 13 shows the LED status of the Guardmaster® 440G-LZ guard locking
safety switch during normal operation.
Table 13 - Switch Status during Normal Operation
Diagnosis of Switch
Condition Using LED
Indicators
LED Indicators Off
When the LED indicators are OFF, Bulletin 440G-LZ is not connected
properly to either the 24V power supply or ground. Check the power supply
and the wiring to the switch. Check that the input voltage is within
specification (measures between 20.4V and 26.4V DC).
LED Indicators Solid Green
When the LED indicators are solid green, the switch is in the operational state.
The guard door is closed and locked and the OSSD outputs are ON. This is
normal operation and no action is required.
Guard
Status
Lock
CMD
OSSD
Input
Lock
Status
(1)
(1) See Lock Command on page 25.
Status
Indicator
OSSD
Status
State
Open or
closed
Unlock Off or on Unlocked Solid red Off Safe
Open Lock Off or on Unlocked Fast flash
green
Off Safety Inputs (Safety A+ and Safety
B+) are not connected to 24V DC or
there is a demand on the device
connected in series.
Closed Lock Off Locked Slow flash
green
Off Ready. Close guard door to lock
Closed Lock On Locked Solid green On Operational