Section-6
04-3008_S6_ABB_OPMCPDPA-S2_GB_121202
Page 5/6 ABB
Printed in Switzerland – Modifications reserved
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!
WHEN BOTH ON/OFF BUTTONS ON ALL UPS MODULES IN A
PARALLEL SYSTEM ARE PUSHED THE POWER SUPPLY TO THE
LOAD WILL BE INTERRUPTED.
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!
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.
6.1.2.7
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
CONCEPTPOWER
DPA
TM
S2
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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