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6.1.2.5 ON/OFF – Main Buttons
The ON/OFF-Buttons serve to shutdown the UPS-system for service or maintenance or for emergency reasons.
!
NOTE!
6.1.2.6 Parallel Isolator (IA2)
Every UPS-unit (Means each Module) is provided with a parallel isolator IA2. The parallel isolator is an important
element of the UPS-unit, that allows the isolation of a Module from the parallel system without the need to transfer
the load to bypass.
!
NOTE!
6.1.2.7 Maintenance Bypass (IA1)
There are two types of Parallel System Configurations: redundant and capacity parallel systems
(see SECTION 5).
6.1.2.7.1
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).
6.1.2.7.2
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).
6.1.2.8 ECO-MODE (BYPASS MODE) in Parallel Systems
The Eco-Mode function in a Parallel System is the same as in Single Systems. If in a PowerScale Parallel System
the load is supplied by the mains(load on mains) and in the event of mains failure, all UPS's will automatically
transfer the load back to the inverters with 5msec.
In order to provide the load with maximum protection the manufacturer always recommends
!
that the load be supplied by the inverter (ON-LINE-Mode).
WHEN BOTH ON/OFF BUTTONS ON ALL UPS MODULES IN A PARALLEL
SYSTEM ARE PUSHED THE POWER SUPPLY TO THE LOAD WILL BE
INTERRUPTED.
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 THE IA2 OF A UPS-MODULE BE SURE THAT
THE STATUS OF THAT UPS-MODULE IS THE SAME AS OF THE REST OF THE
OPERATING UPS-MODULE 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.
04-3004_S6_OPM_ABB_POWERSCALE_10-50 kVA_EN_150113.doc
Printed in Switzerland – Modifications reserved
Section-6
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