CU320 to CU320-2 issues - motor overheating

Hi all,

Has anyone else had problems with motor overtemperature issues after changing the obselete CU320 v2.3 to a CU320-2 v4.6?

The Control Unit runs 2 drives with 2 motors (6SL3120-ITE26-0AA3) and a 55kw line filter (6SL3130-7TE25-5AA3). I am seeing overtemps of 130C on only one motor. The same fault has occured on 2 seperate machines so it is not a mechanical issue. Is it possible a parameter has been changed during the upgrade process? 

Thanks in advance for any help, 

Adam

I have upgraded the module to v4.8 but the problem still occurs. 

All the parameters in the P600 range look good. We are using a KTY84 connected via CU terminals. This is not a thermistor problem as the motor is very hot to touch. 

After the motor identification is complete the machine stalls and does not move. I then reverted to a backed up program. 

The motor is pulling ~50% more current compared to the machines with a CU320, but the parameters are the same or "Does not Exist". I have checked them many times. The same fault is occurring on 2 machines which are both running which rules out a mechanical issue. They are hitting overtemperature every 2 hours or so.

The motor is a Siemens 1LA9133-4LA12-Z

Motor data is the same as the nameplate. 

P304 230Vrms

P305 38.9Arms

P307 11KW

P308 0.83 PF

P310 50HZ

P311 1450 rpm

P640 113A Current limit

With the CU320-2 the motor will pull ~100A on takeoff. It would only pull ~65A with the old CU320. I believe this is where the problem is, but cannot work out how to fix it.

Thanks for any help in advance.

Adam.

I have found the cause of the overtemperature issue for anyone having similar issues.

P1310 - Continuous voltage boost was changed to 100% from 175%. This has caused the temperatures to drop ~40°C.

I now have 2 machines running flawlessly with a CU320-2 with P1310 at 100%

I still have 10 machines running with the old CU320 with P1310 at 175%.

New question published by Zyad is split to a separate thread with the subject Fault 1600 and 1611.

Best regards
Jen_Moderator