Xantrex SW Series Owner's Manual

Contents

Xantrex SW Series Owner's Manual Manual pdf 72 page image

OPERATIONPage64 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 2001CHARGER MODEIN BRIEFWhen AC power is available, the inverter can operate as a very powerful battery charger with low currentdistortion. Power is drawn over the full AC cycle. This improves the performance with low AC input voltageor with small generators.The SW Series Inverter/Charger includes the ability to automatically “back-off” the battery charger toprevent overloading a generator or tripping a circuit breaker when other AC loads are being operatedthrough the inverter. This improves system reliability and allows greater use of the power available. Thecharger will also be turned off if the AC voltage drops to an adjustable lower limit VAC setting.THREE STAGE CHARGING PROCESSThe charging cycle uses three stages. During the initial "Bulk Charge" stage, the inverter charges atmaximum rate allowed by the SET MAX CHARGE AMPS AC setting. This causes the battery voltage torise over time. After the battery voltage nears the SET BULK VOLTS DC setting, the charger starts thesecond or “Absorption” stage. During this phase, the charge rate is gradually reduced while the batteryvoltage is held near the bulk voltage setting. This ensures that the battery is fully charged. The final "Float"stage is initiated when the battery has been held near the SET BULK VOLTS DC setting for theadjustable ABSORPTION TIME period setting. At this point, the battery voltage is allowed to fall to theFLOAT VOLTS DC voltage setting, where it is maintained until another bulk charge cycle is initiated. Thisreduces gassing of the battery and keeps it fully charged. A new three-stage charge cycle is initiated afteran AC source is reapplied to the AC HOT input terminals, or daily if the BULK CHARGER TRIGGERTIMER (15) is enabled and if AC power is available continuously.Figure 21, Three-Stage Battery ChargingAC SOURCE CHARGER BATTERYAC DCIf a generator was started automatically by theinverter to charge the battery, it will be shut off whenthe charger reaches the float stage after thebulk/absorption period. (GENERATOR must be inAUTO mode)Bulk Stage Absorption Stage Float StageDC VoltageAC Current Constant Current Reduced Current Reduced CurrentBulk Volts SettingFloat Volts SettingTimeMax Charge AmpsSettingAbsorption TimeChargingStartedIncreased Voltage Constant Voltage Reduced Voltage