Indication of motor direction with Power Module

We have recently noticed that using the Dewesoft Power Module for measurement of motor (inverter) power does not give an indication of direction (CW or CCW). This can be observed in the vector scope, but this information is not saved in any field in reduced rate recording. Is there any way to record this?

Hello Edward!

You are right, this is currently not directly available in the reduced data. But you could create a Math or a User input channel that you could then export and use it as indication of the rotation.

@Teo Podlesnik

Thanks Teo, but even in Full speed data, the direction of rotation is available under which channel?

ed

Dear Ed!

Sorry for such a late reply, I have been away on a business trip for the past 3 weeks.

We don't have a dedicated channel with that information. You can create your own channel that will help you indentify in which direction the motor is spinning.

@Teo Podlesnik

Thanks for the reply Teo. Do you have an example how this can be displayed?

@Edward Sciberras

the best way would be with a C++ script so you could get the a channel that outputs text i.e. CW or CWW, but you need a license for C++ plugin. In your case what you can do is, you can create a math formula:

if(CONDITION,R1,R2) --> this means, if your condition is satisfied the function will return R1, else it will return R2.

This CONDITION could be the angle between two voltages, a counter angle signal etc...since you are using the vector scope to identify the rotation now, I would just the voltages in the formula. For your return conditions i would just return R1=1(CCW/positive), R2=-1(CW/negative). This could look something like this: if('phi_U_L2_H1'>0,1,-1)

phi_U_L2_H1 is the angle between U1 and U2 and is going to be either +120 degrees or -120 degrees. If it is 120, it will return 1, meaning a positive or CCW rotation, and -120 degrees it will yield -1 or negarive/CW rotation. When you will export your Math channel you will see +1 or -1, indicating your rotation direction.

This hopefully will solve your issue.