Eaton 9395 Installation And Operation Manual

Also see for Power Xpert 9395P: Installation and operation manual Installation and operation manual Installation and operation manual Installation and operation manual User and installation guide

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Eaton Power Xpert™ 9395P Sync Control Installation and Operation Manual P-164000502 Rev 1 4-1Chapter 4 Operating InstructionsThis chapter describes the operation of the Eaton Sync Control with a UPS or SSBMsystem.4.1 Startup for UPS Systems Equipped with an Eaton Sync ControlStartup and operational checks must be performed by an authorized Eaton CustomerService Engineer, or the warranty terms as specified on page 5-1 become void. Thisservice is offered as part of the sales contract for the UPS. Contact service in advance(usually a two-week notice is required) to reserve a preferred startup date.4.2 Understanding Eaton Sync Control OperationThe Eaton Sync Control maintains critical load synchronization of two separate singleEaton 9395P UPS systems, or two separate 9395 SSBM systems. See Figure 4‐1 fora typical block diagram of the system. Synchronization of the UPS systems facilitatesthe uninterrupted transfer of customer loads from one load bus to another by meansof downstream, dual-source, solid-state transfer switches. Enable the automaticsynchronization action of the Eaton Sync Control by pressing the LOAD SYNCENABLE pushbutton on the front of the panel. When enabled, the LOAD SYNCENABLE pushbutton illuminates.The Eaton Sync Control panel provides a three-phase synchronization reference toeach system. Each system uses this reference to regulate the inverter phaserelationship so that the two system outputs can maintain synchronization with eachother. To establish the three-phase synchronization reference, each system providesbypass sensing voltage and output (critical load) bus voltage to the Eaton SyncControl.Under normal operating conditions, bypass sensing voltage from each system isprovided back to its inverter through the Eaton Sync Control. As long as the twobypass sources feeding System-A and System-B are available and in phase, eachsystem remains in synchronization with its own bypass source and the two systemsremain in synchronization with each other. If the two bypass sources become out ofphase with each other (>0.1 Hz apart) or one or both sources become unavailable, theEaton Sync Control provides a new three-phase synchronization reference to thenon-master system as determined by the PREFERRED SOURCE SELECTOR switch.The non-master system's new synchronization reference is provided by the EatonSync Control from the output (critical load) bus of the system designated as masterby the PREFERRED SOURCE SELECTOR switch. See Figure 4‐2 for a diagram of thesynchronization reference control operation.When the two bypass sources regain availability and synchronization, the Eaton SyncControl provides the non-master system with its own bypass sensing voltage as asynchronization reference. Before resynchronization occurs, a 15-second preset timedelay ensures the two bypass sources maintain acceptable synchronization.Figure