Note: Do not plug laser printers into this UPS! The power require- ments of a typical laser printer are much larger than the requirements of other computer peripherals and may trip the UPS’s rear panel circuit breaker. Plug laser printers into a quality surge suppressor. Remember that print jobs can be
3.7 Test for Proper Operation
After the UPS has had a chance to recharge its battery, turn on the UPS’s power I/0 control and switch on your computer equipment. The indicator within the switch should be illuminated and your equipment should operate normally.
To test the operation of the UPS, simply unplug its input cord or press and hold the Test switch (on units so equipped) to simulate a utility blackout. The lamp within the power I/0 switch will flash and UPS will immediately transfer your equipment to power derived from the UPS’s internal battery. During this time, the UPS will emit one beep once every 5 seconds to remind you that your equipment is operating from a source of power that is limited in duration. Restore normal operation by releasing the Test control or by plugging in the line cord. Observe that your equipment operates normally during both transfer from utility power to UPS power and back again. Repeat this test four or five times to ensure proper operation. See the following section covering Overloads if abnormal operation is encountered. The power I/0 control switches power to your equipment. If you leave your equipment power switches on, the I/0 power control can be used as a master on/off switch!
3.8Overloads
If the total power requirement of your equipment is much greater than the capacity of the UPS, the UPS’s rear panel circuit breaker may trip. This is called an overload situation. Once the circuit breaker trips, the UPS will attempt to operate the load using its internal power source. This may result in an unexpectedly short run time or, if the overload is severe, the UPS will immediately shut down and cease to power the load. In this case, the UPS will emit a loud tone to alert you of the overload. If this occurs during your test, turn off the UPS and decide which equipment will be left unprotected by the UPS. The circuit breaker may be reset (press button) when the overload is removed.
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