Dual DPA250 User Manual download pdf (Page 80)

Section-6

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6.1 MULTI-CABINET CONFIGURATION

6.1.1 Concept of Multi-Cabinet Configuration

The CONCEPTPOWER DPA

Cabinets may be paralleled for power capacity or for redundancy indefinitely.

Every standard CONCEPTPOWER DPA

is provided with the parallel option and therefore no time-

consuming upgrading is necessary on site.

UPS 1 UPS 2 UPS n

Fig. 1.1. CONCEPTPOWER DPA

Multi-Cabinet Chain.

The Multi-Cabinet Chain is based on a decentralized bypass architecture i.e. every UPS is provided with its

own static bypass. In a parallel system there is always one Master Module and the other Modules are slaves. If

at any time the master is faulty the next UPS (former slave) will immediately take over the master function and

the former master will switch off.

Every UPS unit in a parallel configuration is provided with a proper output parallel Isolator (IA2) which, when

opened isolates the corresponding unit from the parallel system. Once the parallel isolator (IA2) of a unit is

open that unit (module) is isolated from the rest of the parallel system and therefore does not provide power to

the output.

For example if you perform the command “LOAD TO BYPASS” on any unit, all the units will transfer the load

simultaneously to mains and if you perform the command “LOAD TO INVERTER” on any unit all the UPS’s will

simultaneously transfer the load to the inverters.

The CONCEPTPOWER DPA

is paralleled for redundancy (highest availability) or for power parallel

systems.

IMPORTANT:

The BYPASS MODE (ECO-MODE) function of a parallel systems is the same as in single

units of CONCEPTPOWER DPA

. If in a parallel UPS system the load is transferred to the BYPASS (load on

mains) and if the mains fails, the UPS’s will all be automatically transferred to inverter within 5msec.

NOTE!

IN ORDER TO PROVIDE THE LOAD WITH MAXIMUM PROTECTION

RITTAL ALWAYS RECOMMENDS THAT THE LOAD BE SUPPLIED BY

THE INVERTER (ON-LINE-MODE).

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Dual DPA250 User Manual Page 80