S&C Vista - Page 36

36 S&C Instruction Sheet 681-530
Programming the Overcurrent Protection Settings
Different TCC families have different setting selections and editable  elds. Fields that
are not editable will be grey. Selections that are invalid will prompt an error message,
and any cell with an invalid value will be highlighted in yellow after clicking on the Save
button. An error message will also appear at the top of the screen in red text describing
the error. See the “Warnings Messages” section on page 62 for more information on
warning and error messages.
Select protective settings as follows:
STEP 1. Select the Interrupter 1 or Interrupter 2 option from the Selection menu.
STEP 2. Select the desired Time Overcurrent Phase Protection settings. De nitions
for the Time Overcurrent Phase Protection, Low-Current Cutoff,
De nite Time 1 and 2, Ground Protection, Negative Sequence, and
Sensitive Earth Fault settings are available in the “Overcurrent Protection
Setting De nitions” section on page 38. A listing of the available Time
Overcurrent Phase Protection settings can be found in the “Overcurrent
Control Settings” section on page 56.
For fault interrupters configured for Three-Phase Tripping or Single-Phase Trip/
Three-Phase Lockout mode, the Time Overcurrent Ground, Negative Sequence,
and Sensitive Earth Fault protection settings can be enabled if required. These features
are disabled by default when shipped from the factory. See Figure 32.
Figure 32. The Time Overcurrent Ground, Negative Sequence, and Sensitive Earth Fault Protection
menu.
STEP 3. After entering the Overcurrent Protection settings, click on the Save button.
A con rmation message will be displayed. See Figure 33.
Figure 33. A Time Overcurrent Phase Protection confirmation message.