How to Use Analog Output Signal Function in Delta VFD

In this lesson, we are going to learn and discuss about the analog output signal's feedback from the drive. We are having two types of feedback from the drive, now, the feedback always comes in the voltage, 0 to 10 volts, in this drive. Maybe the feedback can be 420 mA in other drive, but here we are getting 0 to 10 volts feedback voltage. This feedback is based on two things, and you can select that. If you want your feedback of frequency,  then you can select the respected parameter, for example, if your frequency is zero hertz, your feedback will be 0 volts. If the frequency is maximum, feedback will be ten volts which is the maximum. So that is a linear curve, zero hertz, zero curve, fifty hertz, ten volts. That is a feedback we are going to get here. The, secondly, you have feedback based on current. In that, you have 0 to 250 percent of the rated AC drive current. So based on the current, you will get feedback in your PLC or HMI, or you can also have a voltage display meter.

Alright, so now, in this lesson, we are going to synchronize the drive based on the feedback. We are going to use the feedback to synchronize other drive.  If you can see the below drawing of two drives we have, the first drive is our master drive on the left hand side. The second drive which is on the right hand side, is slave drive.


If I run the master drive, and change the speed/frequency, the slave drive follow the signal with master drive.  Now, the question is, how it is possible. In the wiring, we are getting feedback from "AFM (analog frequency meter)" terminal of master drive, we have connected this "AFM" directly to "AVI" of the second drive which is our Slave drive. So, the output of master drive, goes to the other drive as an input. The "AFM" will give signal when the drive is running, and at certain frequency,  and which I told you that 0 hertz 0 volts, 50 hertz 10 volts feedback. So that is how we have done the wiring.


This will just synchronize by one by one ratio, if I increase the frequency of master drive, the frequency of slave drive will increase automatically. Now, there is another parameter we have which is named "analog output game", which is by defaulted 100 percent. So what happen if you change the game? If you change the game, for example, let take 50% analog output game, so what happen then, your frequency setting will be in 2/1 ratio. When the frequency of master drive will be 50 hertz, the frequency of slave drive will be 25 hertz.