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User’s Guide P-164000628 P-164000628—Rev 05 1
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The Eaton® Bypass Power Module (BPM) is designed to be a maintenance bypass switch that also contains
flexible output power distribution and mounting options. The BPM is a bypass module that can be used with a
variety of Eaton UPS models including the 9170+, 9155, and 9PX SP.
The BPM provides added reliability to Eaton uninterruptable power supply (UPS) systems by ensuring
seamless, uninterrupted, no-break transfer as well as a lock-out/tag-out (LOTO) feature to ensure the greatest
safety for UPS technicians and electricians. The BPM also offers output distribution in order to simplify wiring in
a rackmount IT environment, potentially removing the need for a panelboard, breakers, and conduit for
distribution.
Although the BPM is designed to be safe, the bypass can carry high levels of voltage and current. The BPM
should only be operated by an experienced user, familiar with UPS behavior and functionality. Installation for
models requiring hardwire connections should be performed by a qualified electrician following local electrical
codes. Please refer to the installation chapter of your UPS manual for the BPM wiring diagram.
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The BPM has three operating positions (see Table 1). Failure to understand the correct bypass sequence and
position may cause the critical load to be dropped. Consider both the operating state of the UPS and the BPM
when protecting your critical loads.
NOTE In the UPS or LINE position, AC input power is still connected to the input terminals
inside the UPS.
Table 1. BPM Positions
Switch
Position
Description
UPS The normal operating state of the system occurs when the BPM switch is
in the UPS position. Utility power is fed to the bypass, where power is then
fed to the UPS. The UPS provides critical battery backup and power
conditioning and power is then fed back to the bypass switch and then the
critical load.
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