In the previous posts we have discussed the use of relays in an electrical circuit. Now it is time to have a look at a relay with no moving contacts; the Solid State Relay. As with all the components you intend using, you need to make sure that you match the equipment to the switching …
We have touched briefly in the past on machine safety and it might be a good opportunity to have a look at some of the things we need to consider when setting up a control circuit on machinery. When we start with the circuit design, we need to know what category the machine falls into …
I put out a bit of a teaser a while ago for this post so it’s time to make it available. You will no doubt have some fun with this one although it is not a commonly used circuit as most applications use three phase motors This circuit may seem a little bit daunting at …
This is going to be a very short post touching on one aspect of Safe Working Practices. Often you will come across installations that have a Manual/Auto Selection. What you need to be very aware of is when you have isolated the circuit at a remote location on the control circuit. With the unit in …
Thought we might spend a bit of time this week to look at a few tips that could save you some time during fault finding on circuits. We will start with two tips on this post, so let’s move onto the first one: Solenoid Valves How can you establish whether a solenoid valve is energized …
To all who have signed up as members, thank you. You will be receiving an interesting circuit on Monday 11/06/2012 for the single phase forward reverse. What I have done is to have a bit of a play and set up a circuit to wire the single phase motor to a forward reverse similar to …
We have covered a little bit about the basics of Fault Finding and Electrical Circuit and we can now have a look at a specific circuit and the steps we would follow. The aim here is to focus on what I said about understanding the machine operation. In order to explain this better, we will …
Just in relation to the last sections where we looked at circuit diagnostics, we will now look at introducing a method to monitor the machine function. Consider a motor that is connected to a pump by means of V Belts. Should the belts break, the motor will still run, hence no fault is evident. That …
During the last post, we had a quick look at including some diagnostic indicators to a circuit Today we will apply this to a circuit that could be used in a pump application. You will note in this circuit that I have used quite a few relays. The first relay you will note is in …
We have had a look at a few control circuits during some of the posts and now it is time to make it a bit more interesting. What we will do is to build some diagnostic tools into the circuit that will assist you in fault finding. Start with the very basic Direct on …