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17
6. Configuration and Operation
6.1.2 Automatic Transfer Switch Source Selection
The ATS will power up and supply output if at least one of the inputs is greater than the minimum
startup voltage. In normal operation, when both sources are of equal quality (“fair” or “good”), the
unit will select the preferred source according to the preferred source selection setting (Refer to the
Navigating Config Menus and Submenus section). If the currently selected source degrades to a
quality less than the currently unselected source, the unit will transfer to the better quality source.
If the currently unselected source improves in quality greater than the currently selected source,
the unit will transfer to the better quality source.
Input Voltage Ranges
Nominal Voltage
200-240V
Minimum Startup Voltage
163V
Good Voltage Range
172-266V
Fair Voltage Range
144-171V
Bad Voltage Range
0-143V
6.1.3 Quick Test
After installing the ATS and connecting equipment, you may test
the Automatic Transfer Switch function by temporarily disabling the
preferred AC input (default is Source A). The ATS will then switch
from the preferred input to the alternate input. When the preferred
input resumes supplying power, the ATS will switch back to the
preferred input.
Note: The two inputs must be connected to separate sources of utility
power. The automatic transfer switch function will be compromised if the
two inputs are connected to the same power source. Do not perform a test
with equipment that must remain in productive operation. Any test
procedure must prepare for the contingency that the equipment may lose
power. Do not test the ATS by detaching power cords which are connected
to live power sources, as this eliminates the connection to ground and
places your equipment at risk.
Preferred Source (A) Active
Alternate Source (B) Active
21-06-222-933683.indb 17 11/29/2021 3:56:23 PM
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