Technical data

5
4 General Requirements
MASTERGUARD Series SIII
UPS Systems from 60 to 800 kVA
5 AC/DC Converter
MKA4CAT0UKSIII/Rev. 11-11/2004/UK
4.2 Safety
In terms of general and safety
requirements, the UPS conforms to
standard EN50091-1-2 governing use
in restricted access locations.
4.3 EMC and surge suppression
Electromagnetic effects shall be
minimised in order to ensure that
computer systems and other similar
electronic loads shall neither be
adversely affected by nor affect the
UPS. The UPS shall be designed to
meet the requirements of EN 50091-2.
The manufacturer and customer in
partnership agree to ensure the
essential EMC protection requirements
for the specific resulting installation.
4.4 Neutral connection and grounding
The Series S
III output neutral shall be
electrically isolated, except for RFI
filters, from the UPS chassis. The input
and output neutral connections are the
same, i.e. they are solidly tied
together. Therefore the UPS shall not
modify the state of the upstream
neutral, in any operating mode, and
the neutral state of the distribution
downstream from the UPS is imposed
by the mains one. Series S
III should be
used in installations with grounded
neutral; for further details please
contact MASTERGUARD Technical
Support.
4.5 Materials
All materials and components
comprising the UPS shall be new and
of current manufacture.
4.1 Applied standards
MASTERGUARD operates in accordance
with TUEV Cert procedures a Quality
Management System which complies
with EN ISO 9001:2000 for the design,
manufacture, sales, installation, maintenance
and service of uninterruptible power
supply systems. The MASTERGUARD
Environmental Policy and Management
Systems comply with EN ISO 14 001
and MASTERGUARD is committed to
implementing a policy of continuous
improvement to production processes
and pollution reduction. Series SIII
shall carry the CE mark in accordance
with the Safety and EMC Directives
73/23, 93/68, 89/336, 92/31 and
93/68. Series SIII is designed and
manufactured in accordance with the
following international standards:
• EN50091-1 general and safety
requirements
• EN50091-2 EMC requirements
•
IEC EN62040-3 operating requirements.
5.1 General/Input
The three-phase current taken from
the commercial AC source shall be
converted to a regulated DC voltage by
a rectifier available in both 6-pulse and
12-pulse versions. Above 200kVA
Series S
III will be available with a 12
pulse rectifier (consisting of two 6-
pulse thyristor rectifiers operating at a
phase shift of 30°) and harmonic filters
as standard. In order to protect the
power components within the system
each phase of the rectifier input shall
be individually fitted with a fast-acting
fuse.
The rectifier battery charger shall be
operable with the following types of
batteries:
• Sealed Lead Acid
•Lead Acid
• NiCd
The selection of the optimum charging
method shall be completely managed
by the microprocessor.
5.2 Voltage regulation, temperature
compensation
The rectifier output voltage shall
operate within narrow parameters. In
order to ensure optimum battery
charging regulation shall be
automatically adjusted to the ambient
temperature.
The rectifier shall be capable of
supplying the inverter with DC voltage
at rated power, even if the input
voltage is below the nominal voltage
tolerance specified. This will not
require the discharging of the batteries.
This connection is illustrated in Figure 2.
Figure 2. Rectifier behaviour during reduction of the commercial AC source.
Imput AC
Voltage
(Nominal Voltage)
(Folat Charge Voltage)
Time
TimeT1 T2
2.27 Vpc
100 %
85%
75%
2.0 Vpc
Battery DC
Voltage
Tecnico-SIII-MG 10-11-2004 8:22 Pagina 5