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Changing Velocity on the fly with MODBUS

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Hello,

I would like to know how to perform on the fly velocity(rpm) changes over Modbus.  I thought I had the answer but  it's not working as anticipated.

It is an AKD-P01206-NBAN-0000 purchased in the Sept 2017

I am in operation mode 1, Velocity and using Service motions.  The SM.MODE is 2.  I am using SM.V2 to change the speed and have set SM.T2 to 0 to enable continuous running.

The value of SM.V2 is changing but the drive only changes speed if I stop and start again (DRV.STOP, SM.MOV)

What would I have to change in my approach to enable changing speed over MODBUS on the fly.  I am using a completely wrong method (service motions) ?

 

thanks!

Mark

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Since you are operating the drive in Velocity Mode, you can use the parameter VL.CMDU to command velocity.  Just send the value over Modbus and the drive will immediately respond.  There is no start or stop command associated with this.  To stop, you can send a value of zero.  Keep in mind that if you lose Modbus communication, the drive will keep running at the last speed that was sent.
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