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14 Automatic Transfer Switch - Installation and Quick Start
Configuring the ATS
Configuring sensitivity
The sensitivity setting controls how tolerant the ATS is of fluctuations in power before it switches to
the secondary power source. Configure the sensitivity range for your ATS using the Switch
Configuration menu. When sensitivity is set to low, the ATS will wait 5 ms before switching to the
alternate power source when there is a disturbance in the power supply. When sensitivity is set to
high, the ATS will wait 3 ms before transferring power. The default setting is high.
Configuring voltage transfer range
The voltage transfer range determines the acceptable RMS voltages for the ATS. When voltage
moves outside the specified range, the ATS switches to the secondary power source. Configure the
voltage transfer range using the Switch Configuration menu. The ATS can be set to narrow,
medium, or wide voltage ranges depending on the power conditions of your system.
Note
The default setting of the voltage range is Medium.
APC Part Number
Nominal Voltage
(L–N)
Narrow Medium Wide
AP7701 120 V 20 (110–130 V) 23 (108.5–131.5 V) 27 (106.5–133.5 V)
AP7722 230 V 30 (215–245 V) 35 (212.5–247.5 V) 40 (210–250 V)
AP7750 120 V 20 (110–130 V) 23 (108.5–131.5 V) 27 (106.5–133.5 V)