Technical data

29
14 Parallel configurations
MASTERGUARD Series SIII
UPS Systems from 60 to 800 kVA
MKA4CAT0UKSIII/Rev. 11-11/2004/UK
14.4 COC monitoring and control
The COC shall incorporate the
necessary controls, instruments and
indicators to allow the operator to
monitor the system status and
performance, as well as take any
appropriate action.
Mimic panel
The COC shall have a mimic panel with
light emitting diodes (LEDs) to indicate
the following conditions, see Figure 8:
Now a single UPS block consists of the
following subassemblies:
•Rectifier
• Microprocessor, IGBT inverter
•Static switch, inline to the inverter
• Matching battery
The centralised switch COC (common
output cubicle ) see Figure 7. The COC
includes:
• Electronic static switch and
reserve supply
• Manual maintenance bypass
switch (switches are not included
in COC above 800A)
Centralised configuration offers
maximum flexibility in positioning UPS
blocks. Vector control ensures that
different UPS blocks of a centralised
parallel system can be placed at
different localities. Power cables from
the mains and to loads may be of
different lengths.
It shall be possible to modify the
parallel configuration of Series S
III from
centralised to modular and vice versa
(provided a COC is included in the
system). This modification may be
done at any time by simply
disconnecting or connecting the COC
to the parallel UPS.
14.3 High Fault Clearance Parallel
Mode
It shall be possible to allow
simultaneous operation of both the
UPS reserve lines (within each UPS)
and the common reserve line in the
COC. Transfer to reserve will therefore
involve the parallel operation of all the
available reserve lines (both UPS and
COC). As a result of such a paralleling
of reserve static switches, the overall
I
2
t capacity of the system shall be
multiplied by four. The increased short
circuit capacity of the high fault
clearance parallel mode of operation
will result in increased ability to clear
faults downstream from the UPS and
hence greater overall selectivity. HFC
parallel mode shall only be feasible if
all reserve lines originate from the
same distribution. All modules within
the HFC system (UPS and COC) will
share the load equally.
UPS (A-H) normal operation green
Reserve supply normal operation green
Load static switch normal operation green
UPS (A-H) alarm green flashing
Reserve supply alarm green flashing
Load static switch alarm green flashing
Figure 8.
Display
A 40 character illuminated LCD (two
lines x 20 characters) shall be provided
to enable the operating parameters of
the UPS to be monitored. The LCD
messages shall be accessed by push
buttons. The text shall be available in
English, Italian, French, German, Spanish
and Portuguese, selectable by the user.
By using the appropriate user switches
it shall be possible to display the
following:
UPS
This module shall display alarms and
status for the connected UPS in the
parallel system.
Reserve Supply
This module shall display alarms,
voltage phase to neutral and frequency
measurements.
Load/Bypass Switch
This module displays alarms, load
voltage phase to neutral, current per
phase, frequency measurements,
percentage load capacity per phase
and the peak factor lpk/Irms of each
phase of the load current. It is possible
to display the total time the load has
been supplied by inverter, by reserve
and time on parallel.
COC
Tecnico-SIII-MG 10-11-2004 8:22 Pagina 29