Eaton 9315P, Installation And Operation Manual

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Eaton 9315/9390/9395/9395P Fixed Primary Sync Control Installation and Operation Manual P-164000023—Rev 03 4-1
Chapter 4 Operation
This chapter describes the operation of the Eaton Fixed Primary Sync Control with a UPS system.
4.1 Startup for UPS Systems Equipped with an Eaton Fixed Primary Sync Control
Startup and operational checks must be performed by an authorized Eaton Customer Service Engineer, or the
warranty terms as specified on page W1 become void. This service is offered as part of the sales contract for
the UPS. Contact service in advance (usually a twoweek notice is required) to reserve a preferred startup date.
4.2 Understanding Eaton Fixed Primary Sync Control Operation
WARNING
Attempts to startup the SBM system yourself may damage equipment and/or your critical load.
Such attempts may also invalidate your system warranty.
CAUTION
As shipped the Eaton Fixed Primary Sync Control is configured for operation with a normally open
contact for the “ON BYPASS” signal. The jumper across terminal points TB140 and TB141 MUST
be removed if a normally closed contact is used for the “ON BYPASS” signal. Removal of this
jumper must be performed by an Eaton authorized service person. Removal or installation of this
jumper by anyone other than an Eaton authorized service person may damage the equipment and/
or the critical load and void the warranty.
The Eaton Fixed Primary Sync Control maintains critical load synchronization of two separate single UPS
systems or to an Eaton Hot SyncCapacity System (Secondary). See Figure 4-1 for a typical block diagram of the
system. Synchronization of the UPS systems facilitates the uninterrupted transfer of customer loads from one
load bus to another by means of downstream, dualsource, solidstate transfer switches. Enable the automatic
synchronization action of the Eaton Fixed Primary Sync Control by pressing the LOAD SYNC ENABLE
pushbutton on the front of the panel. When enabled, the LOAD SYNC ENABLE pushbutton illuminates.
The Eaton Fixed Primary Sync Control panel provides a threephase synchronization reference to each system.
Each system uses this reference to regulate the inverter phase relationship so that the two system outputs can
maintain synchronization with each other. To establish the threephase synchronization reference, each system
provides bypass sensing voltage and output (critical load) bus voltage to the Eaton
Fixed Primary Sync Control.Under normal operating conditions, bypass sensing voltage from the secondary
system is provided back to its own inverter through the Sync Control. As long as the bypass sources feeding
the secondary system and the primary system are available and inphase with each other and the primary critical
load is in phase with its own bypass, the secondary system remains synchronized with its own bypass source
and the two systems remain synchronized with each other. If the secondary system's bypass becomes out of
phase with the primary system bypass (>0.1 Hz apart), the primary critical load loses sync with its own bypass,
or one or both sources become unavailable, the Sync Control provides a new synchronization reference to the
secondary system. The secondary system's new reference is provided by the Fixed Primary Sync Control from
the output (critical load) bus of the primary system (See Figure 4-1).
When the two bypass sources regain availability and synchronization, the Eaton Fixed Primary Sync Control
provides the secondary system with its own bypass sensing voltage as a synchronization reference. Before
resynchronization occurs, a 15second preset time delay ensures the two bypass sources maintain acceptable
synchronization.
To maintain a faulttolerant arrangement, the Eaton Fixed Primary Sync Control accounts for the following fault
conditions or abnormal operating conditions: