IBM 4800-741 Hardware Service Guide - Page 29
Configuration, switches
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Updated July 14, 2008 Configuration switches The DIP switches are located on the front panel of the UPS subassembly (see A in Figure 9). These switches allow you to select whether the ON or OFF state of the connected system unit controls the operation of the UPS during an AC power outage. Standalone mode: When both switches are set to the OFF or the up position (factory default), the UPS always enters battery mode during an AC outage. The unit remains in battery mode until AC is restored or until the battery is discharged. On-battery and low-battery signals are available to the associated system when an RS-232 cable connection is in place, but there is no control of the UPS from the system unit. This mode of operation is typical for the standby type of power supplies commonly found in the marketplace. Host-dependent mode: The host-dependent mode is when both DIP switches are set in the ON or down position. During an AC outage, the UPS does not remain in battery mode for more than five seconds unless there is an active RS-232 connection present from a powered-on system unit. If the system unit is powered on, the UPS remains in standby mode. If the system unit is powered off, the unit does not stay in standby mode. When AC power is restored, AC power is again available at the UPS output. This setting is useful for situations where systems units are powered down at the close of business and the main store power is also shut down. This setting prevents the UPS from switching into standby mode and discharging the battery when the store power is removed. A Figure 9. Location of UPS configuration switches Chapter 1. Introducing the SurePOS 700 Models 11