S&C Vista - Page 30

30 S&C Instruction Sheet 681-530
Programming the Control Settings
Nominal Frequency
The Nominal Frequency setting con gures the overcurrent control for the operating
frequency of the switchgear. To change the switchgear frequency:
STEP 1. From the Global Settings menu, select the frequency setting to match the
system operating frequency. See Figure 26.
Figure 26. Select the nominal frequency from the Global Settings menu.
STEP 2. Click on the Save button. A message will display showing that the setting has
been saved.
Continuous Current
The Continuous Current setting con gures the overcurrent control for the turns ratio
of the switchgear’s current transformers. The turns ratio depends on the continuous
current rating of the switchgear:
Continuous Current, A Turns Ratio
600 660:1
900/1200 1320:1
To change the Continuous Current setting:
STEP 1. From the Global Settings menu, select the continuous current setting to
match the continuous current listed on the switchgear nameplate. See Figure
27.
Figure 27. Select the continuous current from the Global Settings menu.
STEP 2. Click on the Save button. A message will display showing that the setting has
been saved.