Schrack Technik AVARA MLT Series User manual

USER MANUAL
UNINTERRUPTIBLE POWER SUPPLY
Series AVARA MLT
USMLT 10, 12, 15, 20 kVA
3 phase input / 3 phase output
On Line / Double Conversion (VFI) Technology

page
2

page
3
I NTRODUCTION
Thank you for choosing this product.
Our company is specialized in the design, development and production of uninterruptible power supplies (UPS).
The UPS described in this manual is a high-quality, meticulously-designed product, built to guarantee the best
performance.
This manual contains detailed instructions on how to use and install the product.
For information on how to use your equipment to its full potential, this manual should be kept close at
hand beside the UPS and READ BEFORE STARTING TO WORK ON IT.
© Copying all or any part of this manual is strictly prohibited unless due authorization has been granted by the
manufacturers.
In order to improve the product, the manufacturers reserve the right to make changes to it at any time and with no notice.

page
4
C ONTENTS
OVERVIEW 6
USMLT 6
USMLT 10/20 UPS VIEWS 7
USMLT 10/20 X UPS VIEWS 8
V IEW OF THE UPS C ONNECTIONS 9
V IEW OF THE C ONTROL P ANEL 10
B ATTERY B OX ( OPTIONAL ) 11
S EPARATE B YPASS I NPUT ( OPTIONAL ) 12
I NTERNAL T RANSFORMER 12
A DDITIONAL I NTERNAL B ATTERY C HARGERS 12
INSTALLATION 13
S TORING THE UPS AND THE B ATTERY B OX 13
P REPARING FOR INSTALLATION 13
P RELIMINARY I NFORMATION 13
E LECTROMAGNETIC C OMPATIBILITY 14
I NSTALLATION E NVIRONMENT 14
R EMOVING THE UPS AND THE B ATTERY B OX FROM THE P ALLET 15
P RELIMINARY C HECK OF C ONTENTS 17
I NSTALLING THE UPS AND THE B ATTERY B OX 17
S TEPS TO BE T AKEN TO G AIN A CCESS TO THE T ERMINALS OF THE UPS / B ATTERY B OX 17
E LECTRICAL C ONNECTIONS 18
W IRING DIAGRAMS FOR C ONNECTING TO THE E LECTRICAL S YSTEM 18
I NTERNAL P ROTECTIVE D EVICES OF THE UPS 21
E XTERNAL P ROTECTIVE D EVICES 22
C ROSS S ECTION OF THE C ABLES 23
C ONNECTIONS 23
C ONNECTIONS OF THE MODEL WITH SEPARATE BYPASS 24
R.E.P.O. 24
E XTERNAL S YNC 24
C ONNECTING THE R EMOTE M AINTENANCE B YPASS 25
C ONNECTING THE B ATTERY B OX TO THE UPS 27
M ULTIPLE E XPANSIONS 28
S ETTING THE R ATED B ATTERY C APACITY – S OFTWARE C ONFIGURATION 28

page
5
E XTERNAL T EMPERATURE P ROBE 29
R EMOTE PANEL ( OPTIONAL ) 29
USE 30
D ESCRIPTION 30
P RELIMINARY O PERATIONS 31
P OWERING ON FOR THE F IRST T IME 33
P OWERING ON FROM THE M AINS 34
P OWERING ON FROM THE B ATTERY 34
P OWERING OFF THE UPS 34
G RAPHIC D ISPLAY 35
D ISPLAY M ENUS 36
O PERATING M ODES 37
M AINTENANCE B YPASS (SWMB) 37
R EDUNDANT A UXILIARY P OWER S UPPLY FOR A UTOMATIC B YPASS 38
P ROGRAMMABLE A UXILIARY S OCKET ( POWER SHARE ) 38
P OWER WALK - IN 38
R EDUCING THE L OAD ( TO 200V AND 208V) 38
C ONFIGURING THE UPS 40
C OMMUNICATION P ORTS 43
RS232 AND USB C ONNECTORS 43
C OMMUNICATION S LOTS 43
AS400 P ORT 44
B UZZER 45
S OFTWARE 46
M ONITORING AND C ONTROL S OFTWARE 46
C ONFIGURATION S OFTWARE 46
TROUBLESHOOTING GUIDE 47
S TATUS / ALARM C ODES 51
TECHNICAL DATA 55

page
6
OVERVIEW
USMLT
The UPS units of the USMLT 10 – 12 – 15 – 20 kVA range (VFI-SS-111 type) have been designed using the
latest technology available today so as to guarantee users maximum performance. The use of the new control
PCBs based on multiprocessor architecture (DSP + µP inside) together with high frequency IGBT technology
offers excellent performance both in the input stage (absorbed current harmonic distortion ≤3%) and in output
(output voltage distortion ≤1%).
Thanks to these and many other features plus the easy-to-use design, the USMLT represents a new reference
standard in the three-phase UPS sector.
Depending on user requirements, there are two different versions available:
USMLT 10/20
The USMLT version stands out by its compact size
and new, modern design. These features make it
suitable for any environment.
USMLT10/20 X
The USMLT X version, offers longer autonomy than
the USMLT version, thanks to the possibility to double
the number of batteries inside the cabinet.
10 kVA 12 kVA 15 kVA 20 kVA
Nominal power 10000 VA
9000 W
12000 VA
10800 W
15000 VA
13500 W
20000 VA
18000 W
Output power factor 0.9 0.9 0.9 0.9
Weight (with
batteries)
USMLT 10/20 180 Kg 182 Kg 190 Kg 195 Kg
USMLT 10/20 X 305 Kg 310 Kg 315 Kg 320 Kg
W x D x H
USMLT 10/20 320 x 840 x 930 mm
USMLT 10/20 X 440 x 850 x 1320 mm
Accessories Battery cabinets – Communication boards – Remote mimic panel

page
7
USMLT 10/20 UPS VIEWS
Battery start button (COLD START)
Brake rod
Manual bypass switch Slots for accessory communication cards
Battery fuse holder isolator Communication ports (AS400, USB, RS232)
Output switch
Powershare sockets (10A max. total on the
two sockets) and relative protection
Separate bypass switch (optional) Ventilation fans
Input switch Parallel PCB (optional)
Terminal cover panel 1/0 main power switch

page
8
USMLT 10/20 X UPS VIEWS
Battery start button (COLD START)
Brake rod
Manual bypass switch Slots for accessory communication cards
Battery fuse holder isolator Communication ports (AS400, USB, RS232)
Output switch
Powershare sockets (10A max. total on the
two sockets) and relative protection
Separate bypass switch (optional) Ventilation fans
Input switch Parallel PCB (optional)
Terminal cover panel Remote Emergency Power Off (R.E.P.O.)

page
9
V IEW OF THE UPS C ONNECTIONS
Connection for the R.E.P.O command (Remote Emergency Power Off)
(see previous page for the USMLT 10/20 X version)
Power connections: BATTERY, INPUT, SEPARATE BYPASS (optional), OUTPUT
Connection for remote maintenance bypass command
Connection for external Battery Box temperature probe
Connection for external synchronization signal
Slot for power relay board

page
10
V IEW OF THE C ONTROL P ANEL
Graphic display Function keys *
Left-hand LEDs area: Right-hand LEDs area:
Mains power LED Stand-by / alarm LED
Battery power LED Battery low LED
Load on bypass LED ECO mode LED
* The function of each key is indicated at the bottom of the display and varies according to the menu used.

page
11
B ATTERY B OX ( OPTIONAL )
THE BATTERY BOX IS AN OPTIONAL ACCESSORY. THIS UPS RANGE HAS BATTERY BOX VERSIONS
OF THE SAME SIZE AND MATCHING STYLE.
The Battery Box contains batteries that increase the operating time of the UPS during prolonged black-outs. The
number of batteries contained in it will vary according to the type of UPS to which the Battery Box is to be
installed. The utmost attention must be paid to ensure that the battery voltage of the Battery Box corresponds to
that supported by the UPS.
USMLT 10/20 USMLT 10/20 X
Additional Battery Boxes may be connected in a chain to obtain the desired autonomy time during a power failure.
This series of Battery Box contains two separate strings of batteries, one with a positive voltage and the other with
a negative voltage with respect to the neutral terminal (N).
The basic diagram for the Battery Box is shown here below.
USMLT 10/20
BB480
-
A5
BB480
-
M5
Rated voltage 240 + 240 Vdc 240 + 240 Vdc
Weight 150Kg 270Kg
W x D x H 320 x 840 x 930 mm
USMLT 10/20 X
BB480X
-
M5
BB480X
-
M7
BB480X
-
M3
BB480X
-
M6
Rated voltage 240 + 240 Vdc 240 + 240 Vdc 240 + 240 Vdc 240 + 240 Vdc
Weight 300 Kg 390 Kg 395 Kg 400 Kg
W x D x H 400 x 815 x 1320 mm

page
12
S EPARATE B YPASS I NPUT ( OPTIONAL )
THE DI (OPTIONAL) VERSION OF THE UPS SERIES HAS SEPARATE BYPASS AND INPUT LINES.
The UPS series with separate Bypass ensures a separate connection between the input and bypass lines.
The UPS output is synchronised with the bypass line so as to safeguard against incorrect voltage changeovers in
the alternate phases, in the event of automatic bypass or closing of the maintenance switch (SWMB).
I NTERNAL T RANSFORMER
THE OT (OPTIONAL) VERSION OF THE UPS SERIES DIFFERS FROM THE STANDARD VERSION IN THAT
IT USES AN ISOLATION TRANSFORMER INSTEAD OF THE BATTERIES.
This series of UPS uses an isolation transformer connected to the UPS output terminals.
NOTE: A separate bypass line is supplied on this UPS version.
The transformer is connected to the UPS output terminals, so the values displayed are those of the
quantities measured upstream of the transformer.
The presence of the transformer inside the UPS modifies the system neutral arrangements.
The installation of a remote maintenance bypass parallel to the UPS is incompatible with inclusion of
the transformer. In any event, if the remote maintenance bypass is inserted, make sure, at the time the
remote bypass switch is closed, that the UPS is isolated from the system by opening the input and/or
output switches.
A DDITIONAL I NTERNAL B ATTERY C HARGERS
THE AC (OPTIONAL) VERSION OF THE UPS SERIES DIFFERS FROM THE STANDARD VERSION IN THAT
SOME ADDITIONAL BATTERY CHARGERS ARE USED INSTEAD OF THE BATTERIES.
This series of UPS must be used together with an external Battery Box and is suitable for applications requiring
long back-up times.
NOTE: A separate bypass line is supplied on this UPS version.
The additional internal battery charger cards are powered directly on mains power and have pseudo-sinusoidal
wave form absorption.
If the input switch is closed but the I/O switch is open (UPS switched off) the battery chargers operate
independently. Open the input switch (SWIN) to totally shutdown the UPS and the additional battery
chargers.
AC Version 10 kVA 12 kVA 15 kVA 20 kVA
Nominal voltage 240 + 240 Vdc
Current in addition to that supplied
by the internal battery charger 6A@240Vdc

page
13
INSTALLATION
ALL THE OPERATIONS DESCRIBED IN THIS SECTION ARE TO BE PERFORMED
EXCLUSIVELY BY QUALIFIED STAFF.
The company declines all liability for damage caused by incorrect connections or operations
not described in this manual.
S TORING THE UPS AND THE B ATTERY B OX
The storage room must respect the following conditions:
Temperature: 0°÷40°C (32°÷104°F)
Relative humidity: max. 95%
P REPARING FOR INSTALLATION
P RELIMINARY I NFORMATION
UPS models 10 kVA 12 kVA 15 kVA 20 kVA
Rated power 10000 VA 12000 VA 15000 VA 20000 VA
Working temperature 0 ÷ 40 °C
Max. relative humidity during
operation 90 % (non-condensing)
Max. height of installation
1000 m at rated power
(-1% Power for every 100 m above 1000 m)
max 4000 m
W x D x H USMLT 10/20 320 x 840 x 930 mm
USMLT 10/20 X 440 x 850 x 1320 mm
Weight (w/
batteries)
USMLT 10/20 180 Kg 182 Kg 190 Kg 195 Kg
USMLT 10/20 X 305 Kg 310 Kg 315 Kg 320 Kg
Power dissipated at rated resistive
load (pf=0.9) and with battery as
buffer *
0.63 kW
540 kcal/h
2150 B.T.U./h
0.75 kW
645 kcal/h
2560 B.T.U./h
0.86 kW
740 kcal/h
2940 B.T.U./h
1.15 kW
990 kcal/h
3930 B.T.U./h
Power dissipated at rated distortion
load (pf=0.7) and with battery charged
*
0.49 kW
420 kcal/h
1670 B.T.U./h
0.58 kW
500 kcal/h
1980 B.T.U./h
0.67 kW
580 kcal/h
2290 B.T.U./h
0.90 kW
775 kcal/h
3070 B.T.U./h
Flow rate of fans for removing heat
from installation room ** 340 mc/h 400 mc/h 460 mc/h 615 mc/h
Current leak to earth *** < 5 mA
Isolation protection IP20
Cable input From bottom / on rear
*3.97 B.T.U./h = 1 kcal/h
** To calculate the air flow rate, the following formula may be used: Q [m3/h] = 3.1 x Pdiss [Kcal/h] / (ta - te) [°C]
Pdiss is the power expressed in Kcal/h dissipated by all the devices installed in the installation environment.
ta= ambient temperature, te=outside temperature. To take leaks into account, the value obtained should be
increased by 10%.
The table shows an example of a flow rate with (ta - te)=5°C and a rated resistive load (pf=0.9).
(Note: This formula is applicable if ta>te, only; if not the UPS installation requires an air-conditioning system).
*** The leakage current of the load is to be added to that of the UPS on the earth wire.

page
14
E LECTROMAGNETIC C OMPATIBILITY
This UPS product conforms to the current electromagnetic compatibility (EMC) regulations (C2 class). It may
cause radio interference in the home environment. The user may have to adopt supplementary measures.
This product is for professional use in industrial and commercial environments. Connections to USB and RS232
connectors must be made with the cables provided, or at least with shielded cables less than 3 metres long.
I NSTALLATION E NVIRONMENT
When choosing the site in which to install the UPS and the Battery Box, the following points should be taken into
consideration:
Avoid dusty environments
Check that the floor is level and capable of withstanding the weight of the UPS and the Battery Box
Avoid cramped environments that could impede the normal maintenance activities
The relative humidity should not exceed 90%, non-condensing
Check that the ambient temperature, with the UPS running, remains between 0 and 40°C
The UPS may be operated with an ambient temperature of between 0 and 40°C. The
recommended working temperature for the UPS and the batteries is between 20 and 25°C. In
fact, if the battery has an average life of 5 years with a working temperature of 20°C, the life is
halved if the working temperature is increased to 30°C.
Avoid installing the equipment in places exposed to the direct sunlight or hot air
To keep the temperature of the installation room within the range indicated above, there must be a system for
eliminating the dissipated heat (the UPS kW / kcal/h / B.T.U./h dissipation values are shown in the table on the
previous page). The methods that may be used are:
Natural ventilation
Forced ventilation, recommended if the outside temperature is less (e.g. 20°C) than the temperature at
which the UPS or Battery Box is to be operated (e.g. 25°C)
Air-conditioning system, recommended if the outside temperature is higher (e.g. 30°C) than the
temperature at which the UPS or Battery Box is to be operated (e.g. 25°C)

page
15
R EMOVING THE UPS AND THE B ATTERY B OX FROM THE P ALLET
USMLT 10/20 VERSION
Cut the straps and
remove the cardboard
box by sliding it upwards
Remove the accessory
box and side blocks.
NOTE 1: You will find the
accessory box either
inside the door of the
UPS or on top of the
UPS.
FRONT VIEW REAR VIEW
Open the door and
remove the slides.
NOTE 2: The slides are
fixed to the pallet by a
screw (marked C in the
figure).
Remove the 4 brackets
securing the UPS to the
pallet (the screws are
marked A and B in the
figures).
A
AA
A
B
B
C
B
B
AA
A
A
Using 4 of the previously
removed screws (type A)
secure the slides to the
pallet (as shown). Push
the UPS from the rear off
the pallet with great care.
Make sure that the door
is closed before doing
this
NOTE: All parts of the packaging should be kept for future use.

page
16
USMLT 10/20 X V ERSION
WARNING: IN ORDER TO AVOID DAMAGE TO PERSONS AND/OR TO THE MACHINES,
PLEASE FOLLOW SCRUPULOUSLY THE INDICATIONS GIVEN BELOW.
SOME OF THE FOLLOWING OPERATIONS REQUIRE TWO PEOPLE.
Cut the straps and slide the cardboard
box off the unit pulling upwards.
Remove the packaging.
Remove the box containing the
accessories.
NOTE: The box of accessories may be
inside the packaging or behind the UPS
door.
Remove the two brackets securing the UPS to the pallet
by loosening screws A and B.
Once removed, the two brackets can be used as ramps. Fasten the ramps to the pallet using the screws A and
making sure to align them with the wheels of the unit.
Turn the feet as far as they will go in order to increase the distance between the unit and the pallet.
Make sure that the door is properly closed.
WARNING: to unload the UPS from the pallet, we recommend that you push it down the ramps from
behind, taking every precaution and accompanying the unit along the ramps to the floor. In view of the
weight of the machine, this operation should be carried out by two people.
NOTE: We advise you to keep all the parts of the packaging for future use.

page
17
P RELIMINARY C HECK OF C ONTENTS
Having opened the package, start by checking the contents.
UPS BATTERY BOX (optional)
Metal slides, Guarantee document, User manual,
Cd-rom containing the UPS management software,
Serial connecting cable, 4 battery fuses (to be
inserted in the "SWBATT" fuse holders), Front door
key (USMLT 10/20 X version only)
Metal slides, Guarantee document, Cable for connecting
the Battery Box to the UPS (USMLT 10/20 version only),
4 battery fuses (to be inserted in the "SWBATT" fuse
holders), Front door key (USMLT 10/20 X version only)
I NSTALLING THE UPS AND THE B ATTERY B OX
When installing the equipment, the following points should be considered:
The wheels are to be used exclusively for fine positioning, and thus for small distances only.
The plastic parts and the door are not to be used for gripping or pushing the UPS.
Sufficient space should be left in front of the equipment for it to be turned on/off and maintenance
operations to be performed on it ( ≥1.5 mt )
The rear part of the UPS should be set at least 30 cm from the wall, to enable the air blown by the
ventilation fans to flow away correctly
No objects should be left on its top surface
Having set the equipment in position, secure it by engaging the brake rod (see "Front Views of the UPS" point 8)
situated below the connecting terminals.
(USMLT 10/20 X version only): In seismic areas or for mobile systems, the brackets used to fasten the unit to
the pallet (ramps) can be reused to anchor the UPS to the floor (see the figure below). In normal conditions, the
brackets are not necessary.
S TEPS TO BE T AKEN TO G AIN A CCESS TO THE T ERMINALS OF THE UPS / B ATTERY
B OX
The operations indicated below are to be performed with the UPS disconnected from the mains
powers, turned off and with all the switches and fuse holders of the equipment open.
Follow the instructions provided below to open the UPS:
Open the door
Remove the terminal and switches cover (see "Views of the UPS" ref. 7)
Having completed the installation operations inside the equipment, replace the terminal cover and close the door.

page
18
E LECTRICAL C ONNECTIONS
WARNING: a 4-wire three-phase distribution system is required.
The UPS must be connected to a power supply line made up of 3 phases + neutral + PE (protective
earth) of TT, TN or IT type. Therefore, the phase rotation must be respected.
Optional TRANSFORMER BOXES to convert the distribution systems from 3 wires to 4 wires are
available.
W IRING DIAGRAMS FOR C ONNECTING TO THE E LECTRICAL S YSTEM
UPS without any variation in neutral condition
UPS with galvanic isolation at input
UPS with galvanic isolation at output

page
19
UPS without any variation in neutral condition and with separate bypass input
UPS with galvanic isolation and with separate bypass input
UPS with galvanic isolation at output and separate bypass input

page
20
Separate bypass:
if the separate bypass option is present, protective devices must be present on both the main power supply line
and the bypass line.
Note: the neutral of the input line and that of the bypass are commoned inside the equipment, so they must refer
to the same potential. If the two power supplies were different, an isolation transformer would have to be used on
one of the inputs.
UPS without any variation in neutral condition and with separate bypass input
connected to independent power supply line
UPS with separate bypass input on independent power supply line
and with galvanic isolation at input
UPS with separate bypass input connected to independent power supply line
and with galvanic isolation at output