Technical FAQs

Ask a Question

What does a 991 error code on a Circuit Monitor 2000 (CM2000 / CM2) display mean?

Issue:
CM2000 Series meter's front display shows an alarm code "991" and user may not know what that means and how to fix it.

Product Line:
CM2000, CM2050, CM2150, CM2250, CM2350, CM2450

Environment:
Alarm code, Error Message, Power meter retrofit and replacement
 
Cause:
If the front display of a Circuit Monitor 2000 displays a 991 message, this indicates an internal memory failure.

Resolution:
It is possible that re-loading the latest firmware for the meter could correct the issue. If a firmware refresh does not correct the error, the unit will need to be replaced.

The lateset firmware for a CM2 Series meter can be found here:
FA221408

The following link conains the DLF-3000 software, to re-load the firmware of CM2000: 
http://www.schneider-electric.us/en/download/document/DLF3000/


 
Was this helpful?
What can we do to improve the information ?