CPU 01, 02, or 03 Fail on Unison DR racks
The information in this post is provided to assist in troubleshooting. Perform work at your own risk. ENSURE ANY POWER FROM DEVICES HAS BEEN DISCONNECTED BEFORE SERVICING ANY EQUIPMENT. If you do not feel comfortable performing the work, please contact us or your local service center. Be aware that ETC and its Affiliates are not responsible for any damage or injury caused by service of our products by anyone other than us or our authorized service providers, and such damage is excluded from the product’s warranty.
Symptoms
Unison processor is displaying a CPU Error, and the overlay LED is continually blinking.
Cause
There are several causes for this error:
- One or more of the incoming phases has improper voltage and is causing the phase processor(s) to throw an error.
- One or more of the processor chips monitoring each phase has failed.
- One or more of the opto-isolators for monitoring the phase voltages has failed.
It is entirely possible that this is normal operation due to timing issues at the firmware level. The error should normally clear within about a minute. In systems where the incoming power is dirtier than normal, this error may persist a little longer.