04-3275_OPM_ABB_CONCEPTPOWER_DPA_500kW_EN_REV-A.docx Page 34/78 ABB
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6.2.6 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!
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
6.2.7 Maintenance Bypass (IA1)
There are two types of Parallel System Configurations: redundant and capacity parallel systems
• 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).
6.2.8 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 CONCEPTPOWER DPA
500 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).
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