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Automatic Transfer Switch—Installation and Quick Start14
Configuring the Rack ATS
Configuring sensitivity
The sensitivity setting controls how tolerant the Rack ATS is of fluctuations in power before it switches
to the secondary power source. Configure the sensitivity range for your Rack ATS using the Switch
Configuration menu, which can be found by selecting the Unit tab and the Configuration menu in the
left navigation menu. When sensitivity is set to Low, the Rack ATS waits 4 ms before switching to the
alternate power source when there is a disturbance in the power supply. When sensitivity is set to High,
the Rack ATS waits 2 ms before transferring power. The default setting is High.
Configuring voltage transfer range
The voltage transfer range determines the acceptable RMS voltages for the Rack ATS. When voltage
moves outside the specified range, the Rack ATS switches to the secondary power source. Configure the
voltage transfer range using the Switch Configuration menu. The Rack 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
AP7721 230 Vac ±16 (214–246 Vac) ±23 (207–253 Vac) ±30 (200–260 Vac)
AP7722A 230 Vac ±16 (214–246 Vac) ±23 (207–253 Vac) ±30 (200–260 Vac)
AP7723 230 Vac ±16 (214–246 Vac) ±23 (207–253 Vac) ±30 (200–260 Vac)
AP7724 230 Vac ±16 (214–246 Vac) ±23 (207–253 Vac) ±30 (200–260 Vac)
AP7730 200–208 Vac ±15 (185–223 Vac) ±20 (180–228 Vac) ±25 (175–233 Vac)
AP7732 200–208 Vac ±15 (185–223 Vac) ±20 (180–228 Vac) ±25 (175–233 Vac)
AP7750A 120 Vac ±8 (112–128 Vac) ±12 (108–132 Vac) ±20 (100–140 Vac)
AP7752 120 Vac ±8 (112–128 Vac) ±12 (108–132 Vac) ±20 (100–140 Vac)
AP7752J 100 Vac ±5 (95–105 Vac) ±10 (90–110 Vac) ±15 (85–115 Vac)
AP7753 120 Vac ±8 (112–128 Vac) ±12 (108–132 Vac) ±20 (100–140 Vac)