Issue:
Unable to get LTU software to communicate with and test Micrologic trip unit in Powerpact H, J, or L frame circuit breaker.
Step 1 below should resolve "A1 trip unit identification command failed" error.

Product Line:
Circuit Breakers

Resolution:

1. Check Help and About to see the version of software that you have. If it is anything less than 10.2.7 install the latest software from this link https://www.se.com/us/en/download/document/LTU_Test_Software/ .
   • Install the 32 bit version even for 64 bit computers.
2. Go to the Setup menu item, and select PC Communication Parameters.
   • Under Serial port name, select com port with identifier: Maintenance Module.
   • Under Channel, select USB Maint. Module
   • Proceed with testing
3. If there is a problem with either of the Step 2 items:
   • Open Control Panel, double click on Device Manager.
   • Scroll down to Ports, right click and Scan for hardware changes
   • Expand the Ports tree and check for exclamation points "!".  If you find one on the Maintenance Module port, right click and Update Driver Software
4. Reset the UTA Maint. Module by unplugging from the computer and from the wall outlet for 20 seconds.  Then plug in and reconnect.
5. Go to Setup and PC Communication parameters again and check settings.
   • Under Serial port name, select com port with identifier: Maintenance Module.  If not available, move USB cable to a different USB port on your computer or restart the computer.
   • Under Channel, select USB Maint. Module
6. Go to Remote Functions and Get Micrologic Settings
7. Proceed with testing.

Released for: Schneider Electric USA