Eaton Powerware Series User Manual

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COMMUNICATIONEATON BladeUPS® (12 kVA) User's Guide 164201649 Rev 4www.eaton.com/powerquality 87Parallel CommunicationThe CAN Bridge Card in each paralleled UPS provides connectivity for systemmetering and operational mode control. Startup, shutdown, and auto-calibrationcommands given at one UPS also command the other UPSs in the parallel system.The UPSs in a parallel system are in constant communication to monitor settings andstatus information.Mode TransfersIf one UPS in a parallel system transfers from High Efficiency operation to Standardoperation, the other UPSs transfer also.When a parallel system is on battery, the front panels display the battery statusinformation of the battery with the lowest runtime remaining. When the first UPSshuts down, the other UPSs also shut down. In a parallel system that is not fullyloaded, the system shifts load to UPSs with the strongest batteries or additionalEBMs to maximize runtime.In a parallel system configured for redundancy, the UPSs use a distributed bypass,and the following alarms cause an individual UPS to shut down instead of transferringto Bypass mode: Failure of the fan, fuse, temperature sensor, or power supply Inverter AC under voltage Battery current limit DC link under voltage Battery over voltageRedundant Signal WiringBladeUPS 12i model only. The redundant signal wiring provides redundant backfeedprotection in case of CAN failure in the parallel system. If the CAN fails, the UPSstransfer to Normal mode. The system runs unsynchronized, and any UPS can transferto Battery mode as necessary. If any UPS must transfer to Bypass mode, theredundant signal wiring allows the entire parallel system to transfer to Bypass modewithout backfeeding.BladeUPS 12 model only. The redundant signal wiring provides synchronizationprotection in case of CAN failure in the parallel system. The system uses theredundant signal wiring to determine the system state when the CAN is down. Thesystem operates the same as with CAN, except for a Check Parallel Board alarm.Auto-IdentificationThe BladeUPS parallel system can assign identities to each UPS in the systemautomatically. To take advantage of this feature, wire the CAN Bridge Cards togetheras described in “Parallel UPS Installation” on page 43.When starting up, the UPS with the blue terminating plug installed in the CAN IN portidentifies itself as UNIT 1. The next UPS wired identifies itself as UNIT 2, and so forth.The last UPS with the second blue terminating plug installed in the CAN OUT portterminates the RJ-14 cable network. The auto-identification sequence takes about15–20 seconds to complete once all the UPSs in the parallel system have logic power.If a UPS is shut down or otherwise loses logic power, the UPS will re-identify itself inthe proper sequence once logic power is restored.