32 Rockwell Automation Publication 440G-UM001C-EN-P - June 2019
Chapter 6 Diagnostics and Troubleshooting
LED Indicators Solid Red
When the LED indicators are solid red, the switch is in safe state, meaning the
switch is unlocked.
To transition to operational state, close the door, and turn the lock command
ON, see Lock Command
on page 25.
LED Indicators Flash Green at 1 Hz
When the LED indicators flash green at a 1 Hz rate, the switch is waiting for
24V DC to be applied to the OSSD input signals.
If the 440G-LZ is the only switch or the first switch in a series connection,
check that the safety input signals Safety A+ (red wire) and Safety B+ (yellow
wire) are connected to 24V DC.
In a series connection, check for a demand on the prior switch to determine
why its OSSD outputs are OFF. See Troubleshoot Series Circuit
on page 35.
LED Indicators Flash Green at 4 Hz
When the LED indicators are flashing green at a 4 Hz rate, it indicates the
Lock command is ON, but the guard door is in the open position (RFID signal
is not detected).
If the guard door is confirmed closed and this condition continues, use a spare
actuator to confirm the actuator is working properly.
LED Indicators Repeat Flash Pattern—Green 3x, Red 1x
This LED flash pattern occurs when a condition exists that prevents the switch
from locking or unlocking successfully. This condition can happen when the
guard door is slightly ajar. Confirm that the guard door is closed all the way.
If the door is misaligned and the bolt cannot enter the actuator freely during
locking, or if there is a mechanical load applied to the guard door during
unlocking, it can also prevent the switch from locking or unlocking
successfully. The locking bolt must be free to enter and withdraw from the hole
in the actuator without binding.
Check to see if there is a mechanical load applied to the guard door that
prevents the bolt from retracting.
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