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What can cause a "M/S Warning" error on the ATV930 drive that can not be cleared?

Issue:
What can cause a "M/S Warning" error on the ATV930 drive that can not be cleared?

Product Line:
ATV930

Environment:
All 

Cause:
Issue with the master slave set up

Resolution:
indeed on both (Master and slave) configurations, there is "M/S Device Warning (MSDA)".
This alarm is raised:
On Master, when at least one Slave is not present whereas the Master was running or is waiting to start.
On Slave, when Master device is not present whereas the Slave was running.
 
To avoid this warning, first power-on the master then the slave. It will work as follow:
1 - Master is powered-on; its warning is on as the slave is power-off
2 - Slave is powered-on; its warning is off as the master is detected
3 - Slave is in "RUN"; the warning of the Master is off
 
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