After replacing with a new plc a fault indication coming

we r facing a problem in our plant,we have s7-300 plc(CPU 315-2DP)and simovert master drive ,yesterday plc got damage,after that we replaced it with new one and download the program now we r face a problem that in the HMI(simatic panel sreen touch)it showing fault message'LOW VOLTAGE' as 127 V but from the rectifier unit it isgiving the supply of 420v to all the drive i.e to motors and the HMI through which we control the speed to motor. we download the parameter in rectifier unit and also in drive but also it is showing the same fault so can anybody help me please....

Did you check from where is comming that 'LOW VOLTAGE' status in software?

Best regards,

Hristo Mihalev

Today i check in the software in simatic manager 5.3 it showing a error in the hardware module at CPU when i click on module information it show message that LED fault what does it means can u help me....

the problem is solved

Actually we have replaced the cpu was different before we was having the cpu -315 dp (6es..AG0) but after that we replaced it with new cpu -315 DP(6ES....AH0) so it was not configured in HWI ,so after that we download all the blocks in plc and download the parameter in the rectifier unit now it working Alhamdulillah.