Eaton 93PM User And Installation Manual

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Contents

8. When all the wiring is completed, close the front door and secure it with thelatch.5.6.6 Installing signal interface connections in a parallel systemThe installation of the signal interface connections in a parallel system is doneby following the aforementioned instructions. Signal inputs can be paralleledbetween the units, that is, the same contact can be used for several units’ signalinput signaling. This concerns also the EPO signal.5.7 Wiring parallel 93PM UPS systemsThe outputs of multiple 93PM UPS systems can be connected in parallel. Up to8 units can be paralleled. The UPS static bypass power rating needs to beidentical among all the paralleled units. However, paralleled UPS cabinets canbe housed with different number of UPM power modules.The outputs are paralleled to increase the load capacity of the power systemand for redundancy. The system is paralleled for (N+1) redundancy, as long asthere is always one or more UPS online than required to support the load. Thesystem is paralleled for capacity if all UPSs in a system are required to supportthe load.Communication between the UPSs is required for system metering and modecontrol. The system level communication and control are accomplished using aController Area Network (CAN). A pull-chain signal in each UPS, connected tothe other UPSs in parallel and tied to the bypass status relay in each UPS, isused for a secondary communication path. This arrangement ensures bypasscontrol even if the CAN bus is lost.WARNINGDo not connect units equipped with an internal Maintenance Bypass Switch(MBS) or internal transformers in parallel.5.7.1 Power wiring overviewSee Section4.3.2 for the recommended cable and external fuse sizes andinstallation practices.Input feedThe input feed is defined as the power source connected to the UPS rectifier.The feed to all UPS’s inputs must be derived from the same source.Bypass feedThe bypass feed is defined as the power source connected to the UPS bypass.The feed to all UPS’s bypass must be derived from the same source. TheEaton 93PM UPS 30–200 kVA User's and installation guide© Eaton Corporation plc 2017. All rights reserved. Revision: 005 Document ID: P-164000249 73 (126)