Changing ramp speed on running motor ATV320

[MartinPLC]

Hi,

My problem is that on an ATV320 drive which i am operating via Modbus from a M221 PLC. When i start my motor the firs ramp is fine , it is as i set it on the SOMOVE software but when i increase the speed from say 25 Hz to 35 Hz it goes too rapidly. i have tried the frt function and ac2 adjustment but it won't help because i am using modbus. Is there a way to make the secon acceleration smooth too ?

Cheers,

Martin

[Bastian_Schmitz]

Hi,

Normally ramp switching via FRT should also work in the case you control the drive via Modbus.

https://www.se.com/in/en/faqs/FA335688/ 

Alternative you could also write ACC and DEC directly via Modbus through the drive. The values could be changed on runtime.

To reach this you could define a initial modbus value to put ACC DEC into the I/O Scanner

The Modbus Registers for ACC and DEC are

An sample for the use of the I/O Scanner could be found in the integrated sample project