Eaton 9170+ Battery Charger Module (Models ASY-0652 and ASY-0675) User’s Guide 164201399 —Rev F www.eaton.com/powerquality 15Chapter 3 OperationThe Eaton 9170+ battery charger module operates in two automatic modes:l As a charger module within the UPS cabinet under control of the UPS power modulesl As an independent charger module located in an external battery cabinet containing battery modules for theUPS systemUPS Cabinet OperationWhen the battery charger module is installed in the UPS cabinet, it communicates through a controller areanetwork (CAN) bus with the power modules. The power modules monitor and control the battery charger. Alarmconditions detected by the battery charger module are logged and announced by the UPS system (refer to theEaton 9170+ UPS (3-18 kVA) User’s Guide). Normal output voltage is 133 Vdc.External Battery Cabinet OperationWhen the battery charger module is installed in an external battery cabinet, it has no communication path withthe UPS power modules. Therefore, it controls its own operation, independent of any system information withinthe power modules.The module output current limit is set by the rear panel DIP switches. An audible alarm signals module statusand alarm conditions (see “Troubleshooting” on page 23). Normal output voltage is 133 Vdc.Output FoldbackIf the battery charger module senses a charged-battery condition, it folds back its output voltage to preventovercharging system batteries. Output current is controlled by power modules on the UPS CAN bus or by therear panel DIP switches.