Technical data

filter mounted within the 6 pulse
rectifier UPS version (available only up
to 200kVA) shall limit the THDi to less
than 7%. The input power factor will
depend on the output load fraction.
6 pulse 6 pulse +
7% filter
5th harmonic 29 % 4 %
7th harmonic 5 % 3 %
11th harmonic 7 % 3 %
13th harmonic 1 % 1 %
17th harmonic 3 % 2 %
19th harmonic 1 % 1 %
Tot al THDi 30 % 7 %
13.12 12-pulse rectifierr @ THDi < 5%
(optional for 60 – 200kVA, standard
from 250kVA).
This version shall consist of two 6
pulse rectifiers phase shifted by 30
degrees; with an additional inductive
reactance on both rectifier branches.
This shall attenuate the 5th, 7th, I7th
and I9th harmonics in order to achieve
a THDi of approximately 5%. The 12-
pulse rectifier shall be housed within
the UPS cubicle. When this option is
fitted (for 60 – 200kVA range), the
overall AC/AC efficiency shall be
reduced by 2.5%, the generated
acoustic noise increased by I dBA, the
power factor in PFC Mode reduced to
0,90±0,02 and the input voltage
tolerance is –11% @ 192 cells. The input
inrush current shall be limited to <4I
max input
.
12 pulse +
5% filter
5th harmonic 1 %
7th harmonic 1 %
11th harmonic 4 %
13th harmonic 2 %
17th harmonic -
19th harmonic -
Tot al THDi 5 %
13.13 Multiple Bus Synchronization
Module (MBSM)
The synchronisation kit shall be used
to synchronise UPS systems in order
to ensure perfect operation with
CROSS system static switches. To
achieve this, all UPS must be
interconnected. The MBSM box allows
for communication between up to six
UPS. For more than six UPS cascaded
MBSM boxes should be used.
25
13 Options
MASTERGUARD Series SIII
UPS Systems from 60 to 800 kVA
MKA4CAT0UKSIII/Rev. 11-11/2004/UK
It shall also be possible to monitor the
insulation resistance when the rectifier
isolation is not present by taking the
measurement when the input rectifier
switch is open or the rectifier is
switched off.
13.7 Battery Management Modules
(only upon request)
With measuring modules connected
to the battery blocks, enhanced
battery management shall be possible
offering the following features:
• Measurement of the condition of
each individual battery block by
means of separate battery
measuring modules (BMM)
• Analysis of each battery block with
measurement of the minimum and
maximum voltage values.
13.8 Isolation transformer
This option shall be a double wound
transformer housed in a matching
cubicle. The transformer shall
incorporate an electrostatic screen as
standard. The option shall be used to
isolate the rectifier/output/reserve
from the mains AC input. Starting from
250 kVA cable entry shall be from the
top; smaller versions shall have entry
from the bottom. The transformer
cabinets do not include switching
devices. This option may significantly
affect the reserve line inrush current,
influencing the sizing of the upstream
protection devices. For further
information please contact the
MASTERGUARD Technical Support;
optional low inrush current isolation
transformers may be provided on
request.
13.9 Top cable entry
This option shall allow power cable
entry from the top of the UPS.
13.10 Dust filters
This option shall improve the
protection degree of the air entrance
from IP20 to lP40 for specific
applications such as a dusty
environment. The filter shall be housed
in the UPS cubicle (IP20).
13.11 Input harmonic filters for 6
pulse versions (only upon request)
The input current harmonic distortion
Where options described in this
chapter are added to the UPS, the data
presented in the standard technical
data tables may vary. Some options
may not be available contemporarily on
the same UPS.
13.1 Parallel configurations
See chapter 14.
13.2 Remote alarm unit
A remote alarm panel shall be available
to display important individual
messages from the UPS.
Upon request, it shall be possible to
display up to four UPS systems. The
length of the connecting cable must
not exceed 300 m.
13.3 External battery circuit breaker
This option shall include a fully rated
circuit breaker and an additional
auxiliary contact for monitoring its
position. The circuit breaker shall be
housed in a wall-mounted box and
designed for battery systems which
are mounted on racks. Furthermore,
the circuit breaker shall serve as a
safety element for the cross section of
the power cable between UPS and the
remotely placed battery system.
13.4 Backfeed protection (only upon
request)
This option shall prevent any potential
risk from electric shock on the UPS
input AC terminals in the event of
failure by the reserve static switch
SCR. The option shall include a contact
which activates an external isolating
device such as an electromechanical
relay. The external isolating device is not
included in the option. Alternatively, it
shall be possible to incorporate this
device inside the UPS cabinet.
13.5 Additional RFI filters (only upon
request)
Feed-through RFl filters shall be
available housed in a matching cubicle.
They allow a reduction of the
conducted emissions up to the Class B
of standard EN50091-2.
13.6 Battery leakage alarm
ln conjunction with the rectifier
isolation transformer option, the
battery leakage alarm shall monitor the
insulation resistance on the DC bus.
Tecnico-SIII-MG 10-11-2004 8:22 Pagina 25