9.2.5 CT Calibration

To calibrate the current transformer input, connect the current transformer to terminals CT and C.

 

 

Then in configuration level

 

Operation

Do This

Display View

Additional Notes

Select the current transformer calibration phase

1.        Press or to select ‘PHAS’

This is found towards the end of the list of ‘P’ codes

Adjust the CT for no current applied to the input

Select the CT low calibration point

2.        Press or to select ‘Ct 0’

 

Calibrate at 0mA

3.        Press to select ‘GO’

4.        Press or to choose ‘YES’

5.        Press to enter

 

 

 

The controller automatically calibrates to the zero current input.

As it does this the display will show busy then pass, assuming a successful calibration.

 

If it is not successful then ‘FAIL’ will be displayed.

This may be due to an incorrect input current.

 

6.        Press again to confirm

 

 

Adjust the CT for a current of 70mA

Select the CT high calibration point

7.        Press to return to PHAS

8.        Press or to select ‘Ct 70

 

Calibrate at 70mA

9.        Press to select ‘GO’

10.     Press or to choose ‘YES’

11.     Press to enter

 

 

 

The controller automatically calibrates to the 70mA current input.

As it does this the display will show busy then pass, assuming a successful calibration.

 

If it is not successful then ‘FAIL’ will be displayed.

This may be due to an incorrect input current.

 

12.     Press again to confirm and to exit from the calibration phase