Option switches, Option Switch | American Power Conversion 400

5.0 Operation

5.4 Option switches

The UPS has a set of four DIP switches on the rear panel which allow you to configure several options (see Secs. 5.4.1–5.4.4).

Note: You can set option switches at any time, and the effect is immediate.

Note: If all of the option switches are set to the on position, the option switches are disabled. However, the functions controlled by the option switches are still available using UPS monitoring software (see Sec. 5.5.4).

5.4.1 Option Switch 1

The UPS contains utility fault detection circuitry that is extremely sensitive to line voltage distortions including spikes, notches, sudden dips, and swells. The UPS is factory-set to react to such line voltage distortions by immediately transferring the load to on-battery operation, affording maximum protection for all load types. Where power quality is poor because of local cyclic heavy load-switching, or the use of inexpensive fuel generators, the UPS may frequently transfer to on-battery. If the UPS is powering loads that operate normally under such conditions, battery capacity may be spent unnecessarily.

Setting Option Switch 1 to the on (down) position desensitizes the UPS to rapid low-amplitude line-voltage fluctuations, and increases the UPS’s upper transfer voltage by 3%, for a total of 13% above the nominal input voltage. This helps maintain maximum battery capacity for major utility failures.