Operation; Startup For Ups Systems Equipped With An Eaton Fixed Master Sync Control; Understanding Eaton Fixed Master Sync Control Operation - Eaton 9315 Installation And Operation Manual

Chapter 4
Figure
4.1

Startup for UPS Systems Equipped with an Eaton Fixed Master Sync Control

4.2

Understanding Eaton Fixed Master Sync Control Operation

Eaton 9315/9390/9395 Fixed Master Sync Control Installation and Operation Manual

Operation

This chapter describes the operation of the Eaton Fixed Master Sync Control with a
UPS system.
Startup and operational checks must be performed by an authorized Eaton Customer
Service Engineer, or the warranty terms as specified on page 5-1 become void. This
service 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.
Attempts to startup the SBM system yourself may damage equipment and/or your critical load. Such attempts
may also invalidate your system warranty.
As shipped the Eaton Fixed Master Sync Control is configured for operation with a normally open contact for the
"ON BYPASS" signal. The jumper across terminal points TB1-40 and TB1041 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 Master Sync Control maintains critical load synchronization of two
separate single UPS systems or to an Eaton Hot Sync-Capacity System (non-master).
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, dual-source, solid-state transfer switches. Enable
the automatic synchronization action of the Eaton Fixed Master 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 Master Sync Control panel provides a three-phase 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 three-phase synchronization reference, each system
provides bypass sensing voltage and output (critical load) bus voltage to the Eaton
Fixed Master Sync Control.
Under normal operating conditions, bypass sensing voltage from the non-master
system is provided back to its own inverter through the Sync Control. As long as the
bypass sources feeding the non-master system and the master system are available
and in‐phase with each other and the master critical load is in phase with its own
bypass, the non-master system remains synchronized with its own bypass source
and the two systems remain synchronized with each other. If the non-master
system's bypass becomes out of phase with the master system bypass (>0.1 Hz
apart), the master 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 slave system. The non-master system's new reference is provided by the Fixed
Master Sync Control from the output (critical load) bus of the master system (See
Figure 4‐1).
W A R N I N G
C A U T I O N
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P-164000023 Rev 1 www.eaton.com/powerquality
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