Sinamics DCM, question about p51825 & problem with F60010[11.14,16]

Hi

  I have 2x couples of 6RA8028-6DV62-0AA0 and motor 25kW, 400VAC, armature 69.7A, field 2.04A, 3480RPMS. I use starter 4.4.1.

   My drivers are 4-quadrant (selected in DDS and downloaded). By accident I founded p51825 which is selected [2] 2-quadrant power unit in both drives. Is it correct? Please explain me that parameter, cant find an answear, thank You.

   Bigger problem is that one of the couples I can optimize by optimization run (all steps except [30]) without any problem. In steps [27] and [28] it is rotating in full speed (or 80%) and is ok. Optimization is done. But the second couple fall in fail F60010[11.14,16] near max RPMS (~3000). I do everything in the same way but always fail. Drives are parameterized and connected identicaly.

   That fails are not described so I please for help.

   Drives are 90A (and 10A for field) so p50076[0] = 80% and p50076[1] = 30% on both couples.

   I have effect of not optimized current, and with bigger load in low speed (~700RPMS) I can not stabilize RPMS. That first couple behave OK in that case.

greetings and thank You for any help.

Alex

Hello,

Could you please explain the reason of using 2x drives?

Are two motors connected to same shaft or two different drives?

What is the application? How you run optimisation? How the drives are controlled? i.e. by PLC or by DI/DO?

F60010 significance is Armature circuit uneven current distribution.

Please check r50047 indecses [1] to [3] values. Please refer to attached sheet for more information.

Hi PISCEAN

I have two identical winders which are not connected (they are standalone). They are controlled by PLC by Profibus DP (S7-300). From PLC I send only setpoint which is changing very low from high speed to low when winder is wound up. That is no problem.

I run optimisation from Starter control panel so PLC is not important in commisioning.

Now I can not read values of r50047 indecses [1] to [3]. I am out of work. In offline project have 0 values ;// Tomorrow I will try to turn on optimisation and will write.

Any remedy? Even I try and get values of those indexes there will be still problem. Is it possible that cable or cable connection in drive unit or in motor is defective?

Normally I will not use speeds >2500RPMS. I need >2500RPMS only for tuning.

greetings!

I attached name plates.

greetings

Hello,

Please set parameter p51825 = 4 since your drive is 4 quadrant.

Then follow below mentioned optimisation runs, save data & check.

Which optimisation run (step 30) you run? Please follow below sequence.

p50051=24 Optimisation of closed loop field current control.

p50051=25 Optimisation of closed loop armature current control.

p50051=26 Optimisation of speed control

p50051=27 Optimisation of closed loop emf control.

These are important. After successful run of above runs, save data in RON by setting p0977=1. Do not forget this otherwise all data will be lost of power to drive is switched OFF.

Hello

The Default Value of P51825 = 2 .

Therefore if you configure the Drive Offline even with the correct 4Q MLFB(  6RA8028-6DV62-0AA0 ), Starter sets P51825 = 2  instead of 4 ( I think this may be a Bug )

As a result if you download the offline configuration to Drive, P51825 will remain = 2 ( 2 Quadrant )

The Correct procedure for commissioning the drive is :

a) Reset the Drive to its factory settings

b) Upload the drive to starter

c) Complete the basic commissioning offline.

d) Download to Drive

e) Execute Optimisation cycles as suggested by PISCEAN 2010

Hope this helps

Cheers
Navnag

Hi

   I have just changed p51825 = 4. Did optimisation 24,25,26 and in 27 fault F60010[11]. So I did current limit to 95% (before was 100%) and final/initial rounding to 10s (before was 2s), started one more time. Succesfully done (max speed was 80% of 3480rpms). When I started step 28 (friction compensation) fault F60010[15] in range max speed - new index (another thiristor if I am correct). But I think it is unnecessary step because in chart Friction characteristics output is not connected to the main algorythm of working.

   I have done step 29 succesfully and now TakeUp (sorry but before I wroted Winder)  is producing, I will have results in 1-2 hours. Current limit is back 100% and final/initial rounding is back to 2s. So the situaction is this same as yesterday (except succesfully done 27 step)

   I attached current and speed characteristics and value of parameters r50047 from morning tuning crash, please check.

greetings!

problem still exists, current loop can not stabilize rpms and both critically oscillate ;// Started in ~700RPMS, when load was growing up oscillations wasnt better or worse but on that same level.

attached chart

greetings!