AT3600 User Manual

2.3 Quick Start Tutorial

2.3.1 Quick Start Tutorial

After you have installed the AT3600, together with the editor and server software packages as described in the previous section you may wish to follow through this tutorial before trying to create any programs for actual use.

The purpose of this tutorial is to familiarize you with the process of creating a schematic and a test program using the editor. The program you will create will only run if your tester has been installed with the tests used.

CREATING A SCHEMATIC OF A 2-WINDING, 4-TERMINAL SAMPLE TRANSFORMER

This tutorial describes a method of setting up the tester to test a two winding transformer with the following specification:

Before proceeding ensure that the tester is connected to the editor PC as described in chapter 2.2.

Having started the editor program by double-clicking with the left mouse button on the editor icon, the first thing to do is to ‘draw’ a schematic of the transformer to be tested.

Using the left mouse button, click on ‘Schematic’ on the Top Level menu bar, and select ‘Add Winding’ from the menu.

You will now see a winding with two terminals, floating below the mouse pointer.

Place the winding on the left hand side of the screen and press the left mouse button.

A dialogue box will ask you to name the terminals of the winding; the cursor will be in the box for Terminal 1.

Type the name of the Terminal 1 (e.g. ‘A’).

Press TAB to move to the Terminal 2 box, and type the name of the second terminal (e.g. ‘B’) in that box. Then click OK or press [Enter].

Repeat steps 1-3 to create a second winding.

This time place the winding on the right hand side of the screen, a mirror image of the first winding, and use different terminal names (e.g. ‘C’ and ‘D’). The screen should then look like this:

Now you must connect the windings to the test nodes of the tester:

Place the mouse pointer over terminal A; press and hold the right mouse button. Continue holding this mouse button down and drag the mouse pointer to test node 9. Release the button. A wire will now connect terminal A to test node 9.Repeat this procedure to connect the other three terminals, B, C and D to nodes 7, 10 and 8. The screen should now look like this:

You have now created a schematic layout of a four terminal transformer.

Creating The Test Program

After creating the transformer schematic, you may now create an example program, containing the following four tests:
Resistance of winding AB (59 to 73Ω)
Resistance of winding CD (59 to 73Ω)
Inductance of winding AB (>3H)
Turns ratio AB to CD (1:1 ± 2%)

(It is probable that the actual program used to test such a transformer in production would be the same four tests, plus an additional insulation resistance (or Hi-Pot) test to check for winding to winding isolation. This last test has not been included in this tutorial as it would require the use of safety interlocks.)

Initially set up the program options:

From the top level menu bar select:
Program
Options

The following dialogue box will appear:

By clicking with the mouse, enable the following option
‘Send Results to Server’

In the Fixture ID box, enter the name:
‘UNIVERSAL’

Click on ‘OK’ or press [Return] to accept and close the dialogue box.

You can now move on to create the program:

From the Top Level ‘Program’ menu, select ‘Edit’.

The screen will now be made up of three Windows:
Top left: The schematic window showing the two windings.
Right: The available tests window listing all the tests available on your AT3600. (If the tester is connected all unavailable tests will be greyed out).
Lower left: The Program window displaying the tests programmed so far.
By double clicking the left mouse button, select ‘R Winding Resistance’ from the ‘Available Tests’ window.

The following dialogue box will appear.

Initially enter the terminal names. Input ‘A’ as the high terminal and ‘B’ as the low terminal, moving between the fill-in boxes using the TAB key.

Now enter the resistance limits. This can be done in four ways:

% Click on this button to enter a nominal value with a percentage tolerance (for example, 66Ω with 10% tolerance),
>< Click on this button to enter minimum and maximum values (for example, 59Ω and 73Ω),
> Click on this button to enter just a minimum value (for example, > 59Ω),
< Click on this button to enter just a maximum value (for example < 73Ω).

In this example, >< limits will be used:

(The ‘Ohm’ units button is selected by clicking with the mouse.) If the "User Offset Enabled" check box is checked, a value can be entered into the edit box. The value entered (in the units shown) is then added to any results returned from the AT tester. This function can be used to adjust for measurement fixture effects that cannot be compensated for or to compensate the fixture manually so a compensation stage is not required to obtain the correct readings.

Click on the ‘OK’ button. The test and its parameters will now appear in the ‘Program’ window.

Again by double clicking the left mouse button, select ‘R Winding Resistance’ from the ‘Available Tests’ window.

At the dialogue box, enter the data as before; this time for the second winding:

Click on the ‘OK’ button. Again the test and its parameters will appear in the ‘Program’ window.

Now, by double clicking the left mouse button, select ‘LS Inductance (Series Circuit)’ from the ‘Available Tests’ window.

At the dialogue box, enter the data required for the inductance test:

Click on the ‘ > ‘ button to select a minimum limit only, and enter:

Minimum 3 H

The "User Offset Enabled" check box has the same function as before but in units of inductance.

Click on the ‘OK’ button. Again the test and its parameters will appear in the ‘Program’ window.

Finally, by double clicking the left mouse button, select ‘TR Turns Ratio’ from the ‘Available Tests’ window.

At the dialogue box, enter the data required for the turns ratio test:

The AT measures the turns ratio between ‘primary’ and ‘secondary’ windings; and allows the possibility of applying the test voltage to a third ‘energized’ winding. For this example, the primary and energized windings are the same:

Energized high terminal A
Energized low terminal B
Primary high terminal A
Primary low terminal B
Secondary high terminal C
Secondary low terminal D

Using the default ‘ % ‘ type of limits, enter:

The "User Offset Enabled" check box has the same function as before but in units of turns ratio.

Click on the ‘OK’ button. Again the test and its parameters will appear in the ‘Program’ window.

The lower left window should now contain the complete program. The scroll bars in this window enable you to view each test in the program in turn to check that it is correct.

The editor will not allow a program to be run in the AT unless it has previously been saved:

From the top level
menu bar, select
Part >
Save As

At the dialogue box, type in

TUTORIAL
as the part name

Click on the OK button to close the dialogue box and save the test program in the editor default directory.

RUNNING THE PROGRAM FROM THE EDITOR

The following section describes how to run a test program from the Editor. To do this you must first create a program which includes only the test options installed in your tester. You will not be able to include any of the following tests until you have fitted your safety interlock system: AC-Hipot, DC-Hipot, Insulation Resistance, Surge, Watts Loss, Induced Voltage (STRW), Magnetizing Current, Open Circuit Voltage.

Having created both the transformer schematic and the test program, the program is now ready to run on your AT3600 tester under the control of the Editor.

Before proceeding further, make sure that the interface cable between the tester's Auxiliary Port and the selected PC COM port is correctly fitted, and that the COM Port is correctly configured in the editor (see page 2.2.5).

Ensure that the tester has been powered on as described in the previous section (page 2.2.2), and the front panel display is showing:

To run the program:

1. From the Top Level menu bar, select
Tester
Download Program

The editor will now download the test program to the AT3600. After a few seconds, you should see a message to say that the download was successful.

If you see a message indicating that the download has failed, check your cable/COM Port connections and try again. If the download continues to fail, reboot your PC and try again.

The front panel of the AT will now display:

This allows the program to be stored on the AT by pressing the soft key next to 'LOCAL SAVE'. See section 2.3.4. for a description of running the program on the transformer tester.

For now, run the program from the editor software and ignore the AT display:

2. Again, from the top level menu bar, select
Tester
Run Program

The test program will now begin execution.

When it is finished, you will see a dialogue box containing the results of the test. If the transformer had been connected up as in the schematic to nodes 7, 8, 9, and 10 then the results might be:

If no transformer is fitted, the results will have no meaning, but you have now successfully installed the AT3600 and the Voltech AT editor software.

The results window will give you the options to:

1. Print the test results.
2. Re-run the test program.
3. Close the window.

Closing the window will return you to the top level menu.