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Automatic Transfer Switch Installation and Quick Start14

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)

NOTICE

UNSUPPORTED APPLICATION: AP7701 must be connected to sources that are in-

phase. Out-of-phase switching is not supported. Equipment damage may result.

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APC Automatic Transfer Switch Specifications

General