Eaton 9PXM User Manual

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4–20kVA Users Guide P-164000669 4–20kVA Users Guide P-164000669—Rev 09 31NOTE In the UPS or LINE position, AC input power is still connected to the input terminalsinside the UPS.Table 3. Bypass Switch PositionsSwitch Position DescriptionLINE When the switch is in the LINE position, utility power is directly connected to thecritical load and the output of the UPS is disconnected. In this state the UPS remainspowered, which is often beneficial for troubleshooting, obtaining logs, or updatingfirmware.UPS The normal operating state of the system occurs when the BPM switch is in the UPSposition. Utility power is fed to the bypass, where power is then fed to the UPS. TheUPS provides critical battery backup and power conditioning and power is then fedback to the bypass switch and then the critical load.Service Like the LINE position, the SERVICE position connects the load directly to AC inputpower and disconnects UPS output; however, because SERVICE also disconnects ACinput from the UPS, this is the appropriate position for UPS maintenance or repair. Inthe SERVICE position, the UPS can be completely removed from the system.33..77 NNoo BBrreeaakk TTrraannssffeerr ffrroomm UUPPSS MMooddee ttoo SSeerrvviiccee MMooddeeCAUTIONFailure to understand the correct bypass sequence and position may cause the critical load to be dropped. Donot operate the bypsass switch if the UPS is in battery mode. Damage to the power modules or the bypassswitch can occur.To turn the BPM to SERVICE:1. Press and hold the red button and turn the switch to LINE (see Figure 27 ).NOTE Pressing the red button sends the UPS into Internal Bypass mode. This allows the UPSoutput to synchronize with utility for safe, uninterrupted transfer.The UPS is now in LINE mode. The critical load is fed directly from utility and the UPS remains energizedfrom utility power. The UPS may be left in this mode while trying to troubleshoot, gather alarms from theUPS, or perform other preventative maintenance activities.No Break Transfer from UPS Mode to Service Mode