Eaton 91PS User And Installation Manual

Also see for 91PS: Safety and installation quick guide Safety and installation quick guide User and installation guide User and installation guide

Contents

Figure 6. Path of current through the UPS in the bypass modeA Staticswitch1 Bypass in-putMain power flowB Rectifier 2 Rectifier in-putEnergizedC Inverter 3 Output De-energizedD Battery con-verter4 BatterybreakerTrickle currentE Battery Closed OpenIn the bypass mode, the output of the system is provided with single-/three-phase AC power directly from the system input. While in this mode, the output ofthe system is not protected from voltage or frequency fluctuations or poweroutages from the source. Some power line filtering and transient protection isprovided to the load, but no active power conditioning or battery support isavailable to the output of the system in the bypass mode.The static bypass consists of a solid-state, silicon-controlled rectifier (SCR)static switch (STSW) and a backfeed protection isolation device K5. The staticswitch is rated as a continuous-duty device that is used anytime the inverter isunable to support the applied load. The static switch is wired in series with thebackfeed protection. As the static switch is an electronically-controlled device, itcan be turned on immediately to pick up the load from the inverter withoutinterruption. The backfeed protection is normally always closed, ready tosupport the static switch unless the bypass input source becomes unavailable.Eaton 91PS/93PS UPS 8-10 kW User's and installation guide© Eaton Corporation plc 2018. All rights reserved. Revision: 003 Document ID: P-164000672 24 (102)