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PowerWAVE 9000 DPA UPS - Multi-Cabinet Configuration
(Issue 2.1 Oct. 2009)
6.2.6 ON/OFF - Main Buttons
The ON/OFF-Buttons shutdown the UPS-system for service and
maintenance or for emergency reasons.
IF BOTH ON/OFF-BUTTONS ARE PRESSED ON THE UPS MODULE IN
A MULTI-MODULE SYSTEM ONLY THAT PARTICULAR UPS MODULE
WILL SHUTDOWN. TO SHUTDOWN THE COMPLETE SYSTEM PRESS
BOTH ON/OFF BUTTONS ON EVERY UPS MODULE OF A MULTI-
MODULE SYSTEM.
6.2.7 Parallel Isolator (IA2)
Every UPS module is provided with a parallel isolator IA2. The parallel
isolator is an important element of the UPS allowing the isolation of a unit
from the parallel system without the need to transfer the load to bypass.
IA2 OPEN: THE CORRESPONDING UPS MODULE IS ISOLATED FROM
THE OUTPUT. THERE IS NO COMMUNICATION BETWEEN THE
ISOLATED UNIT AND THE REST OF THE PARALLEL SYSTEM. THE
ISOLATED UPS MODULE MAY BE REPLACED WITHOUT
COMPROMISING THE REST OF THE SYSTEM.
IA2 CLOSED: THE CORRESPONDING UPS IS BEING ADDED TO THE
REST OF THE PARALLEL SYSTEM.
IMPORTANT: BEFORE CLOSING IA2 OF A UPS MODULE BE SURE
THAT THE STATUS OF THAT MODULE IS THE SAME AS OF THE REST
OF THE OPERATING MODULES WITH CLOSED IA2. EXAMPLE: IF
ALL UPS's WITH CLOSED IA2 ARE ON INVERTER, MAKE SURE THAT
THE UNIT ON WHICH ISOLATOR IA2 IS BEING CLOSED IS ALSO ON
INVERTER.
6.2.8 Maintenance Bypass (IA1)
There are two types of Parallel System Configurations: redundant and
capacity parallel systems (see Chapter 5).
Redundant Parallel Configuration
In a redundant parallel system a UPS-module may easily be isolated from
the parallel system by opening the respective isolator (IA2). It is now
possible to operate or shut down this unit without influencing the rest of the
parallel system. The rest of the parallel system will continue to protect the
load. The isolated UPS-Module may be replaced without the need of
transferring the load to bypass by means of the Maintenance Bypass (IA1).
Capacity Parallel Configuration
In the event of a fault in one of the UPS-Modules in a capacity parallel
system the load will automatically be transferred to static bypass (mains).
In order to replace the faulty module the load must be transferred to mains
by means of Maintenance Bypass (IA1).
