lvdssensorwiring
I have an LVDT Sensor for measuring linear displacement similar to the one on the picture. The problem is that I don't have the manufacturer's wiring diagram and they don't provide it, because originally it has a six pin connector. It's a 6 wire LVDT:
Pin 1 – Orange
Pin 2 – Black
Pin 3 – Yellow
Pin 4 – Blue
Pin 5 – Red
Pin 6 – Gray
How can I determine which cables correspond to each of the LVDT's Primary and Secondary Coils?
Here is a guess as to what the diagram might be. It might be possible to figure out which wire is which and whether or not this diagram makes sense by careful measurement of resistance. I think I have the L-M-H sequence backwards.
More re resistance measurements etc.
To figure out which winding is which and which speed and voltage taps are connected to each winding, you need resistance measurements that distinguish very small resistance differences, perhaps 0.1 or even 0.01 ohms. If you can verify which wire is neutral and which winding is which, you may be able to run the motor, measure current and estimate speed to help determine the rest. Accurately (and inexpensively) measuring low ohms is a good subject to research.
If you can't find detailed information on the motor, you will also need to guess at the capacitor value. You will be able to find tables that give ranges based on motor power and voltage.
You might consider taking the motor housing off and carefully examining the lead wire routing, the connections to the windings and the winding wire size. Be careful doing that. The windings are somewhat fragile and there may be several washers on each end of the shaft that need to be in the right order. Those tend to stick either on the shaft (good) or on the bearing in the housing where they might drop off when you are not looking (bad). The bearings themselves may stay on the shaft or in the housing.
Without knowing the motor current rating, it may be difficult to know if you have everything right if you get the motor running. If you don't know why this motor was taken out or why the air handling system was scrapped, you don't have any reason to assume this is a good motor.
The wiring was correct as follows:
Mains:
Secondaries:
Output voltage of secondaries: 15VAC
Bridging output of both rectifier bridges with a 2.2uF cap.
Output of combined secondaries from both rectifier bridges: 48VAC
The problem was that I was not using the multimeter properly.
Best Answer
One pair of wires will bt the primary and no be galvanically connected to the other four wires. Use a multimeter to confirm which they are.
Set up an oscillator on that winding and debug the other wires as per the signal you get from them. The centre tap to one end should give X volts when the armature is central. Ditto centre tap to the other end AND you should get 2X volts across the two ends.
The 6th wire is probably a screen.