Technical data

14 Parallel configurations
MASTERGUARD Series SIII
UPS Systems from 60 to 800 kVA
28
MKA4CAT0UKSIII/Rev. 11-11/2004/UK
14.1 Modular
The UPS systems of the Series S
III
series shall be capable of operating in
parallel modular configuration. For this
purpose UPS systems of the same
rating shall be connected in parallel to
form multi-module configurations.
The parallel connection of UPS
shall either improve reliability, the
total output power, or both.
Provided Series S
III is supplied with the
parallel kit option, up to eight equal
UPS units can be operated in parallel
for power upgrade or increase of
redundancy. This option can also be
added on at a later date. The option
shall consist of one subassembly
POB (Parallel Operation Board) and 25
pole, screened data lines to
the neighbouring UPS modules.
A multi-module system shall be
controlled and monitored automatically
by controlling the individual UPS
systems. The reserve lines and
inverters included in each UPS share
the load. The load sharing among the
UPS parallel system (“load on
inverter” mode) shall be achieved with
a tolerance of less than 5% at any
system load fraction (0 - 100%).
14.1.1 System bypass switches
A system bypass switch shall be
available as an option for the modular
parallel configuration. For parallel
systems including more than two UPS,
a system bypass switch must be
provided within the installation,
including two power disconnect
switches. The ratings available shall be:
Height Weight Depth Weight
(mm) (mm) (mm) (kg)
400 A 1780 620 858* 300
800 A 1780 620 858* 400
1600 A 1780 1020 858* 500
2500 A 1780 1020 858* 600
* including front handle; without
handle 830 mm
14.2 Centralised parallel with COC
The centralised paralleling architecture
enables UPS with inhibited bypass to
be connected in parallel. Hereby the
reserve supply to the loads works with
one central equipment (COC).
Figure 6. Modular parallel systems
Figure 7. Centralised parallel systems with COC
BATTBATT
BATTBATT
Load
Load
SQ2
U. V. W. U1. V1. W1. U. V. W. U1. V1. W1.
UPS 1 UPS 2 UPS n
UPS 1 UPS 2 COCUPS n
U2. V2. W2. N
U. V. W. U. V. W.
U2. V2. W2. N
Tecnico-SIII-MG 10-11-2004 8:22 Pagina 28