This alarm appears on the drive operator panel, which means that power module#2 is switched off during running. by inspection find that the incoming voltage to the rectifier unit drops 40 volts (in normal it is 690v, so it drops to 650v).
in this case there is no alarm related to UNDERVOLT in the inverter.
1-change AGPS card…. (problem happens again)
2-change safety relay connected to AGPS card…. (problem happens again)
3-replace the power module itself by another one …… (problem happens again)
I ask for help if any…