Speed for the V20 by MODBUS

Hi guys.

Can anybody tell me the reason why I write 1000 rpm in the register 40101 and 918 is shown in the OP? Or 1420 if I write 1500in the same register?

Your max RPM is configured at 56 RPM rather than 56 Hz.  Just a guess. 

jelemu

Hi guys.

Can anybody tell me the reason why I write 1000 rpm in the register 40101 and 918 is shown in the OP? Or 1420 if I write 1500in the same register?

Hi 0_Einstein.

Thank you but that´s not the problem. P1082=50Hz.

Maybe I didn´t explain it very well. What I meant is that whenever I write 13200 in reister 40101 which i think it is equivalent to 1320rpm, in my OP screen, 40,28Hz are shown.

In the same way, if I write 10000 to that register, (1000rpm), 30,52HZ are shown.

Can anybody give me a piece of explanation? I don´t know what to think... What´s the relationship between 1320rpm and 40,28Hz and the other pair of values?

Whilst I cannot answer this one, and you may have the following correct:

P2000 = reference frequency (50Hz @default) = 4000H

Is P2000 @ 50Hz??

In the p2000, 50Hz is the value.

P0700(0)= 5, P1000(0)=5.

I have done some changes in different parametters and now, motor doesn´t work. He gets the command word because it sounds as it wanted to start working whenever I send that order. It stops making that sound if I ask it to stop. But it doesn´t work an d in the panel 0 Hz is shown. It seems that it doesn´t receive the setpoint I send.

I didn´t change the proyect in TIA PORTAL, so it has to be a matter of parameters... I´ll keep on working on it...

It works again. I changed p1000 into 25 value (USS/MODBUS on RS485 + Analog setpoint 1) and it worked again. Then, I changed it back to 5 and worked too. There must be any parameters which depend on these values and are changed automatically...

Anyway, the original problem keeps in my mind. I keep on looking for a piece of explanation about the reaso why I send 15000 to adress 40101 and 45,78 is shown in my BOP... :-(

Looking at P1000 in the manual, (page 204 maybe), changing the value in P1000 resets some values to default, P1070, P1071, P1075, and P1076.

The set point register 40101, PZD2, the value should be in hex, with the reference value (P2000) representing 50Hz, 4000H, at default?

The frequency set point can be read in r20, is this the same as the BOP display?

Tractor

Wooow!!

That´s correct. It works as you told me.
I didn´t know that i had to write not the dersired speed in rpm but in a value refered to p2000 as you told me.

So, there should be sent to the register 40101 a value which sould be between 0 and 16#4000. Being 16#4000 equivalent to 50Hz (p2000), 16#2000 =25Hz, and so on...

Now It´s christal clear for me.

Thank you very much for your help and your patience with me during these days.

It was a pleasure for me. Bye.

Cool, good to see it is now working. 

Thankyou

Tractor