Eaton 9315/9390/9395/9395P Fixed Primary Sync Control Installation and Operation Manual P-164000023—Rev 03
1-1
Chapter 1
Introduction
The Eaton
®
Control maintains the critical load outputs of two separate single UPS systems in synchronization.
Use of the Eaton Fixed Primary Sync Control provides the uninterrupted transfer of the load from one load bus
to another by means of downstream, dualsource, solidstate, transfer switches. Without the load sync option,
the two system output (critical load) buses could become out of phase with each other. This condition occurs
when suitable bypass sources are not available or when the bypass sources feeding each system are not in
sync with each other.
Examples of this condition are two systems supplied by separate generator sets, or the bypass sources for the
two systems are lost.
The additional use of the optional Sync Control Primary Interface unit allows multiple systems to be synced
using one Sync Control unit.
Figure 1-1 shows the front view and Figure 1-2 shows the interior view of the Eaton Fixed Primary Sync
Control. Figure 1-3 shows the optional Sync Control Primary Interface enclosure.
Figure 1-1. Eaton Fixed Primary Sync Control
ON BYPASS
SYNCHRONIZED TO PRIMARY SOURCE
SYNCHRONIZED TO OWN BYPASS
UPS SYSTEM
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