Below you'll find a list of all posts that have been categorized as “Uncategorized”
In previous articles we’ve taken the approach that we want to make the best use of our drive; but suppose we want to break it? Maybe the easiest way to do this is to connect the drive to an incorrect, higher voltage than specified. Most commonly, this happens when a 230V drive is connected to a 400V supply. Despite labels …
In the last article we looked at the practical construction of variable frequency drives; now we’ll get down to the practical side of choosing and installing a VFD. If you have a motor in mind to control, you can select the drive simply by looking at the power and voltage of the motor. Remember to check the actual supply you …
In the last article we selected and installed our variable frequency drive. Now we’ll look to commission it – that is, run it up and check it out. It is always good to start by getting the motor turning if it is safe and easy to do so. As mentioned in the previous article, the Invertek variable frequency drives are …
In the last article we commissioned the drive, and hopefully got the motor turning. Now we need to adjust the settings to suit the motor and application. As previously explained, the settings in the drive are controlled by parameter values. Invertek variable frequency drives have thirteen basic parameters which allow the drive settings to be optimised for most applications. We’ll …
In the last article we looked at the basic parameters and how they are used to set the drive up to match the motor and the application. Now we’ll look at some of the extended parameters, which allow more advanced settings. Most variable frequency drives have several analogue or digital inputs that can be programmed for different functions using parameter …
In the last article we looked at using the parameter settings to match the drive to our control methods and needs. Now let’s look at a wider topic; energy saving. There are many reasons for using variable frequency drives. They make process control and machine operation much easier; they reduce inrush current and make starting more controlled; they reduce unnecessary …
We’ve mentioned a few times how closed loop control is used to maintain constant temperature, pressure etc., and how most drives have this feature built into the drive, so few external components are needed. Let’s look at this in detail. Firstly, let’s talk about the difference between open and closed loop control. If we are using a pump to maintain …
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