Calculated Winding Exponent Setting; Checking Winding Temperature - Advanced Power technologies TTC-1000 Instruction & Operation Manual

This will program the winding rise time constant to 7 minutes.

4.4.5 Calculated Winding Exponent Setting

The m exponent used to calculate winding temperature can be modified. The two
choices are 0.8 for non-directed FOA type transformers and 1.0 for directed FOA
or FOW types.
Programming from the front panel, press the
is displayed:
Press the YES button. The first character will flash. Use the
to scroll between NO and YES. Press YES when you have made the correct
selection.
For programming from a PC just type the Cooling Type on the "Enter:" line as
follows:
This will program the Cooling Type to directed FOA/FOW. Enter 0 for all other
cooling types.

4.4.6 Checking Winding Temperature

A built in WNDGCAL test function is provided to verify proper operation of the
calculated winding temperature function. All settings described in Sections 4.4.1
through 4.4.5 must be made before performing this check. To verify correct
operation of calculated winding temperature:
 Connect the split core CT to the unit as described in Section 3.3.
 Loop a conductor from a suitable test set capable of generating 5.0 Amps
RMS through the window of the split core CT.

 Press the
arrow button until the display reads:
Enter:151/7
PRGM SETTING 152
DIRECTED FOA=NO
Enter:152/1
WNDG TEMP AT 5A
WINDINGCAL = 45°c
39

arrow button until the setting 152

or

arrow buttons
V6.70 20131017