Single Point Lesson (SPL) Current Calibration For Welding Guns 1

2 Preparation Ensure that the following settings are made In the General Tab the Current Measurement Mode should be set to.. Secondary Regulation.

Select the calibration routines which can be located on the Electrode Page Current Calibration For Welding Guns 3 Ensure that the Transformer Type, Heat Level Warning and Upper current limit are set as shown Ensure that the Diodes settings are as follows To access Current Scaling for either Gun 1 or Gun2, Press the Current Scaling Key

Current Calibration For Welding Guns 4 Type here the upper and lower heat limits for the calibration routine ( As a rule the upper limit should be 20 more than the value of the lower limit) Select here the Program you wish to use for the calibration routine. You should select a program that is associated with the relevant electrode you wish to calibrate. To assist with this all Timers will have Program 248 set for Gun 1 Calibration and Program 246 set for Gun 2 Calibration. Press the OK button to enter the next screen If you want to change the values, place a tick in the box before you type in the new values. The changes will then be stored for the next time the routine is entered.

Current Calibration For Welding Guns 5 You should now place a calibrated Miyachi DC Current meter over the secondary of the Gun. Close the gun manually using the ABB hand pendant Press the Start Wld button to perform a short circuit weld

Current Calibration For Welding Guns 6 Read the recorded value from the Miyachi Current Meter and enter it into the Upper Heat Measured Current box as shown Press the Enter Key and a “1” appears at the side of the box indicating that the first reading attempt has been carried out and the data has been sent to the timer. Again press the Start Wld button to perform another Short Circuit Weld and repeat the steps above. This time when the Enter Key is pressed a “2” appears indicating the second attempt.

Current Calibration For Welding Guns 7 Now press the continue key to proceed to the lower heat limit calibration routine Again press the Start Wld button to perform another Short Circuit Weld.

Current Calibration For Welding Guns 8 Read the recorded value from the Miyachi Current Meter and enter it into the Lower Heat Measured Current box as shown Press the Enter Key and a “1” appears at the side of the box indicating that the first reading attempt has been carried out and the data has been sent to the timer. Again press the Start Wld button to perform another Short Circuit Weld and repeat the steps above. This time when the Enter Key is pressed a “2” appears indicating the second attempt.

Current Calibration For Welding Guns 9 Now press the continue key to exit the Current Calibration Routine When the Continue Key is Pressed an Information point appears that shows the calibrated Toroid Sens. At this point the Secondary of the Gun can be opened and you can proceed with OK

Current Calibration For Welding Guns 10 You should now return to the Sequence page and manually close the Gun with the Miyachi Current meter Still in place to test the Programmed Current set in the Weld 2 Heat Value. You can either fire the Short circuit Weld from the Robot by calling Program 248 or fire the sequence from The Timer by using the procedure on The Next Page. JLR standard tolerance is +/- 200 A of Programmed Value

Current Calibration For Welding Guns 11 Starting the weld from the timer. Press the Diagnostic Button Select Simulate Start Select the Program you had selected in the Sequence page. At the position Start with Ignition click once in the “On” tab The timer will now execute a weld