Eaton 9PHD User And Installation Manual

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Any differences in wire length result in decreased capacity and improperoperation of the UPS system while in the bypass mode.5.7.2 Control signals overviewTwo controls signals (External CAN Network, Bypass Pull-Chain) are requiredfor external paralleling. Both of these control signals are fault-tolerant andalarmed when disconnected.External CAN (ECAN)ECAN provides means for communications between the UPSs in a parallelsystem. The system continues to share load and protect the load when thisnetwork fails.Bypass Pull-ChainBypass Pull-Chain is an open collector signal that goes low when the bypassstatic switch of any UPS is online. When External CAN (ECAN) is down, thepull-chain is low and the UPS is online, the UPS locks to and transfers to thebypass mode. Service can manually shorten this signal in some rare failuremodes to force the system transfer to bypass.Signal Inputs ActionsNone of the inputs are pre-programmed. They need to be separatelyprogrammed by qualified service personnel. See5.6 for default values. EachUPS has a maximum of 9 signal inputs, 5 native and one in each MiniSlot whenusing a suitable connectivity device. These inputs can be configured with actionitems. These action items affect all the UPSs in the system. When an actionitem is active on a UPS and the MOB is closed, the action item is transmitted onthe ECAN to all the UPSs. All the UPSs react in the same manner as if theaction item was active on that UPS.Wiring the EPO switch in parallelUse separate EPO circuits for each parallel unit.5.7.3 Installing bypass control wiring1. During the installation, obey all the safety instructions given in thisdocument.2. Terminal block X13 for external parallel control signals is accessible on thesignal interface area, above or next to the power wiring terminals (seeFigure31 and Figure32 ).Eaton 9PHD UPS 30–200 kW User's and installation guide© Eaton Corporation plc 2017. All rights reserved. Document ID: P-164000531 74 (127)