Xantrex 120 VAC/60 Owner's Manual

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Xantrex 120 VAC/60 Owner's Manual Manual pdf 77 page image

OPERATION 2001 Xantrex Technology, Inc.5916 - 195th Street N. E.Arlington, WA 98223Telephone: 360/435-8826Fax: 360/435-2229www.traceengineering.comSW Series Inverter/ChargerPart No. 2031-5Rev. C: February 2001Page69INVERTER/CHARGER MODEIN BRIEFThe SW Series Inverter/Charger is capable of automatically transferring AC loads from the inverter to autility grid or generator. Once transferred, the inverter can recharge the battery. The inverter/charger cantransfer upon the availability of AC power (FLT mode), either at a specific time each day (using the GRIDUSAGE TIMER (18) menu heading), or upon a low battery condition (LBX mode).TRANSFERRING UPON AVAILABILITY OF AC POWERWhen AC power is supplied to the AC HOT IN 1 or AC HOT IN 2 input, the inverter automatically transfersfrom inverter mode to battery charger mode. Before transferring, the inverter verifies that both the ACinput voltage and frequency are within tolerance. It then synchronizes waveforms and connects to theinverter’s AC output without interruption of power.The FLT mode is the default mode (see the GRID USAGE menu item under the INVERTER SETUP (9)menu heading) and may be used with AC power supplied to either the AC HOT IN 1 or AC HOT IN 2input. This is the proper mode for most utility connected applications or for use with a back-up generatorthat is being manually or automatically started.The SLT mode is used only with AC power supplied to the AC HOT IN 1 input. The SLT mode is selectedfrom the GRID USAGE menu item under the INVERTER SETUP (9) menu heading. In this mode, the onlyoperational difference is that the battery charger will only be engaged for a single period of time each day,set by the BULK CHARGE TRIGGER TIMER (15) menu heading setting. This reduces the powerconsumption of the inverter over the period of a day. It is also used in applications where the slight noiseof the inverter might be undesirable, such as at night. AC power continues to be passed through theinverter’s transfer relay while the charger is not engaged. If the AC source fails, the inverter will turn onautomatically and power the connected AC loads. When utility power returns, the AC loads will bereconnected to the utility and the battery charger will complete a bulk charge cycle. Once this has beencompleted the battery charger will turn off, but the loads will remain connected to the utility.TRANSFERRING BASED ON BATTERY VOLTAGEThe LBX mode is used only with AC power supplied to the AC HOT IN 1 input. The LBX mode is selectedfrom the GRID USAGE menu item under the INVERTER SETUP (9) menu heading. In this mode, thedecision to transfer to and from charger mode will be based upon the battery voltage. With LBX enabled,the SET LOW BATTERY CUT IN VDC setting and the SET LOW BATTERY TRANSFER VDC settingdetermine the DC transfer voltages. When the battery voltage reaches the LOW BATTERY TRANSFERVDC setting for more then 20 seconds, the AC loads are transferred from the inverter to the utility. If thebattery voltage reaches the LOW BATTERY CUT IN VDC setting, the AC loads are transferred from theutility to the inverter. The low battery transfer system includes a 20 second delay so that large loads areless likely to cause a transfer to the utility grid during motor startup, etc.INVERTER/CHARGERUTILITY GRIDAC LOADSACBATTERYDCGENERATORACAC