Recent content by Phaneas

Which exact solver do you use in Simulink and which in Matlab? Maybe you are usisng a varibale step solver in Simulink

If you have 1800A motor current I guess you are using 2 or 3 cables in parallel per motor phase. If you swapped cables after reconnecting you could have shorted out two phases.

At least you should measure if you're 3 Motor Currents a symetric and if the current you see on your display has something to do with the current you measure. Still wondering where all the current should come from if running in frequency mode and having no load on the motor. Or do you run the...

For example KEB has Master-Slave units, but the only reason is, they do not have bigger converters and to supply converter at higher power range they are coupling them together

Thanks for the replies, but the developer does not have really an answer at the question, because that's the difference about theoretical calculation and reality. And there is not much experience with that large drives. I talked to another developer and he had measured a Danfoss VFD. He...

come on, any comments please!

Hello, we try to optimize the parameter set of a 2.2 MW Drive with field oriented control. We try to get the best result between reference torque of the control and actual torque measured at the motor shaft. We have tolerances depending of motor speed and amplitude of the torque of around +/-...

For me Matlab Simulink, too

Just type the color after your pair of values plot(t,T1,'gr',t,T2,'bl',t,T3,'r',t,T4,'ye',t,T5,'cy'); and so on. but look in the help for plot there should be everthing explained. Regards Phaneas

A load drop can also cause a short voltage peak. Do you have no brake resistors at the drive?

Hello, I also found this one here: http://www.postech.ac.kr/ee/cmd/publications/A%20Theoretical%20minimum%20DC-link%20capacitance%20in%20PWM%20converter-inverter%20systems.pdf What Voltage ripple in % is normally used for the calculations?

Hello, I have to calculate the necessary dc link capacitance for a VFD. Does anybody know a good book or other documents how this is calculated. Couldn't find too much in the net. Thanks in advance.

Hi, I found the cause, the read and address bit were set at the same time and caused a phenomenon called "metastable state of D-Flip-Flop" which let the whole chip oscillate and let it do unexpected things

I think it is the 2 in row 11 cause this is not monotonically increasing. Your other question i didn't really understand what you mean.

Is the DC Link Bus 600V_DC? Cause in this case the max motor voltage you can run is 600V_DC/sqrt(2) = 425V_AC And if the motor voltage is too low the VFD will try to compensate that missing voltage with a higher current