ABB Conceptpower DPA 500, Operating Manual

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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
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
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).