Riello UPS CSS sentryum CBM User manual

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SUMMARY
GLOSSARY OF ACRONYMS 3
PREPARATIONS 4
INSTALLATION ENVIRONMENT 4
ELECTROMAGNETIC COMPATIBILITY 5
OVERVOLTAGE PROTECTION 5
PRELIMINARY INFORMATION FOR INSTALLATION 5
INTERNAL BATTERIES 6
BATTERY MAINTENANCE 6
SENTRYUM EMERGENCY SUPPLY THREE PHASE - CBT 7
EXTERNAL PROTECTIVE DEVICES 7
RCD BREAKER (RESIDUAL CURRENT DEVICE) 7
BACKFEED PROTECTION 7
THERMAL-MAGNETIC CIRCUIT BREAKERS 8
SHORT CIRCUIT PROTECTION 8
SHORT CIRCUIT WITHSTANDING 8
INTERNAL PROTECTIVE DEVICES 8
POWER CONNECTION INFORMATION 9
ELECTRICAL CONNECTIONS (CBT) 10
WIRING DIAGRAMS FOR CONNECTING TO THE ELECTRICAL SYSTEM 10
SENTRYUM EMERGENCY SUPPLY SINGLE PHASE - CBM 11
EXTERNAL PROTECTIVE DEVICES 11
RCD BREAKER (RESIDUAL CURRENT DEVICE) 11
BACKFEED PROTECTION 11
THERMAL-MAGNETIC CIRCUIT BREAKERS 11
SHORT CIRCUIT PROTECTION 12
SHORT CIRCUIT WITHSTANDING 12
INTERNAL PROTECTIVE DEVICES 12
POWER CONNECTION INFORMATION 13
ELECTRICAL CONNECTIONS (CBM) 14
WIRING DIAGRAMS FOR CONNECTING TO THE ELECTRICAL SYSTEM 14
CSS COMMISSIONING 15
POSITIONING INFORMATION 16
POWER CONNECTION INSTALLATION 17
CSS DETAILS 20
POWER CONNECTION DETAILS 21
CBT -THREE PHASE VERSION 21
CBM -SINGLE PHASE VERSION 21
CONNECTION OF CBM 22

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COMMUNICATION INTERFACE 23
R.E.P.O. 23
PROGRAMMABLE IN –OUT SIGNALS 23
USB/SERIAL RS232 24
COMMUNICATION SLOTS 24
APPENDIX 25
JUMPERS INSTALLATION/REMOVAL 25
CHECKING THE PACKAGING CONTENTS 26
FIXING THE SIGNAL CABLE 27
REMOVING DOOR 28
ANCHORING THE CSS TO THE FLOOR 28

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GLOSSARY OF ACRONYMS
Acronym ITEM Description
CSS Central Supply System Life safety emergency system conforming to
EN50171 standard
CBT Three Phase Sentryum CSS Three phase output voltage central supply system
CBM Single Phase Sentryum CSS Single phase output voltage central supply system
SLOT Expansion Slots Slot to accomodate the communication cards and
relay expansion board
COM Communication Board It includes USB + RS232 communication ports + EPO
signal interface + contact interface
PAR Parallel Board Communication interface card between CSS for
parallel function
SWBATT Battery Switch
Internal Battery fuse holders.
Warning: these fuse holders disconnect only the
batteries contained in the CSS cabinet
SWMB Manual Bypass Switch Maintenance bypass switch disconnector
SWIN Mains Input Switch Mains input switch disconnector
SWBYP Bypass Input Switch Bypass line input switch disconnector
SWOUT Output Switch Output switch disconnector
B+ - Positive battery voltage/current/temp.
B- - Negative battery voltage/current/temp.

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PREPARATIONS
READ THE "SAFETY MANUAL" BEFORE STARTING THE CSS INSTALLATION
INSTALLATION ENVIRONMENT
When choosing the site in which to install the CSS and the Battery Cabinet, 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 CSS and the Battery Cabinet
 Avoid cramped environments that could impede the normal maintenance activities
 The relative humidity should not exceed 90%, non-condensing
 Avoid installing the equipment in places exposed to the direct sunlight or hot air
 This equipment is intended for use in a controlled environment; hence the temperature must be regulated within a range
between 0 and 40°C
The CSS may be operated within an ambient temperature of between 0 to 40°C. The recommended working
temperature for the CSS and batteries is between 20 to 25°C. Please note, the battery life is halved if the
working temperature is increased by 10°C.
To maintain the temperature of the installation room to within the range indicated above, there must be a system for eliminating the
dissipated heat (the CSS kW / kcal/h / B.T.U./h dissipation values are shown in the table below). 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 CSS or
Battery Cabinet 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
CSS or Battery Cabinet is to be operated (e.g. 25°C)
AMBIENT AND DIMENSION DETAIL Table 1
Ambient temperature for the CSS 0 - 40°C
Recommended temperature for battery life 20 - 25°C
Range of relative Humidity 5 - 95% (without condensing)
Maximum Operating Altitude
(according with IEC/EN 62040-3)
Full power up to 1000 m a.s.l.
(power derating of 0.5% for each 100 m between 1000 and 4000 m)
Storage Temperature CSS: -25°C ÷ +60°C Batteries: -15°C ÷ +40°C
Isolation protection IP20
(IP21, IP30, IP31 are available on request)
Colour RAL 7016
Ventilation Forced, front to rear
(Air filter Door as option)
Cable input Bottom
Pollution degree PD2
Vibration resistance 1 m/s2
Overvoltage category / Protective class OVC II / class I
CSS Dimension (WxDxH) [mm] 440 x 840 x 1320
CSS size [kVA] 6 8 10 15 20
Size according to EN 50171 [kW] 5 6 8 12 16
Shipping Weight without batteries [kg] 122 122 123 125 127
Shipping Weight with full battery configuration [kg] 431 431 432 434 436
Weight without batteries [kg] 102 102 103 105 107
Weight with full battery configuration [kg] 411 411 412 414 416
Battery
(maximum quantity that can be housed internally)
Space for: 3 x (20+20) 7/9 Ah blocks
(Output transformer alternative to internal batteries)

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ELECTRICAL INFORMATION TABLE Table 2
6 kVA 8 kVA 10 kVA 15 kVA 20 kVA
Power [kVA / kW] 6/6 8/8 10/10 15/15 20/20
Power according to EN 50171 [kW] 5 6 8 12 16
V Input [V] Three-phase (CBT / CBM) N/A 400 ± 20% (3PH + N)
Single-phase (CBM) 230 ± 20% (PH + N)
Frequency Input [Hz] 50 - 60
V Output [V] CBT N/A 380-400-415 (3PH + N)
CBM 220-230-240 (PH + N)
Frequency Output [Hz] 50 / 60
Power dissipated @ 100% triphase load (1) N/A N/A
0.41 kW
350 kCal/h
1400 B.T.U./h
0.59 kW
505 kCal/h
2000 B.T.U./h
0.84 kW
720 kCal/h
2860 B.T.U./h
Power dissipated @ 100% single-phase load (1)
0.26 kW
224 kCal/h
887 B.T.U./h
0.34 kW
292 kCal/h
1160 B.T.U./h
0.44 kW
375 kCal/h
1485 B.T.U./h
0.62 kW
530 kCal/h
2100 B.T.U./h
0.89 kW
765 kCal/h
3030 B.T.U./h
Flow rate of the fans for removing the heat from the
installation room (2) (referred to single-phase) 140 m3/h 180 m3/h 235 m3/h 330 m3/h 475 m3/h
(1) 3.97 BTU / h = 1 kcal / h
(2) 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=1).
(Note: This formula is applicable if ta>te, only; if the CSS installation does not require an air-conditioning system).
ELECTROMAGNETIC COMPATIBILITY
This CSS 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 must be made with the cable
provided; the connection to the RS232 (RJ10 connector) have to be made with shielded cables less than 3 metres long.
OVERVOLTAGE PROTECTION
The CSS has been designed to be powered by an AC mains supply with category 2 voltage spikes. if it connected to an AC supply
with different characteristics or if it is potentially subject to even transitory overvoltage, external protection equipment must be installed
to it.
PRELIMINARY INFORMATION FOR INSTALLATION
ALL OPERATIONS DESCRIBED IN THIS SECTION MUST BE PERFORMED BY QUALIFIED AND
TRAINED PERSONNEL ONLY.
Our Company assumes no liability for damages caused by incorrect connections or operations not described in
this manual.
The following operations have to be performed with the CSS disconnected from the power source, switched off
and with all equipment switches open.
Before making the connection, open all cabinet switches and verify that the CSS is completely isolated from all
power sources: battery and AC power supplies. In particular, check that:
- the CSS input line is completely disconnected
- the CSS bypass line is completely disconnected
- the CSS battery line switch/fuses are open
- all CSS switches are in the open position
- check with a multimeter that there are no dangerous voltages
The first connection to be made is the protective conductor (earth wire), this must be connected to the bolt
marked as PE.
The CSS must only be operated whilst connected to a suitable earthing system.
The input Neutral must always be connected.
ATTENTION: a three-phase 4-wire distribution system is required.
The standard CSS version must be connected to a 3 Phase + Neutral + PE (ground protection) power source.
Ensuring that the incoming phase rotation is within a clockwise direction.
ATTENTION: After the installation operations are completed, refit all of the cabinet protection panels using the
appropriate screws supplied.

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INTERNAL BATTERIES
CAUTION: If the CSS has INTERNAL BATTERIES, follow all the PRECAUTIONS AND SAFETY RULES listed below.
 The CSS has HAZARDOUS electrical voltages inside it, even when the input and/or battery switches are off. The inside of
the CSS is protected by safety panels which should not be removed by untrained personnel. All installation and maintenance
or operations involving access inside the CSS require the use of tools and may ONLY be performed by trained personnel.
 The CSS contains an internal source of energy: batteries. All terminals and sockets may be live even without connecting the
CSS to the mains supply.
 The total battery voltage may be potentially dangerous: it may generate an electric shock. The battery compartment is
protected by safety panels which should not be removed by untrained personnel. All installation and maintenance of the
batteries involve access inside the CSS and require the use of tools: such operations may ONLY be performed by trained
personnel.
 Replaced batteries must be considered TOXIC WASTE and treated accordingly (refer to RAEE-WEEE manual “DISPOSAL
OF THE APPLIANCE AND/OR ITS PARTS)”. Do not dispose of batteries in a fire: they may explode. Do not attempt to open
the batteries: they are maintenance-free. In addition, the electrolyte is harmful to the skin and eyes and can be toxic.
 Do not turn on the CSS if it is leaking fluid or if you see a residual white powder.
 Do not allow water, liquids in general and/or other foreign objects to get inside the CSS.
 Do not open the battery fuse holder while the CSS is powering the load in battery operation mode. The interruption of the
battery DC may cause an electrical arc resulting in equipment failure and/or fire. In addition, if there is no mains power, the
energy to power the load is provided by the batteries, therefore opening the battery fuses would lead to the shutdown of the
load.
 Follow these recommendations when working on the batteries:
 Remove wristwatches, rings and other metal objects
 Use tools with insulated handles
 Wear rubber shoes and gloves
 Do not lay tools or metal objects on top of the batteries
 Disconnect the charging source before connecting or disconnecting the battery terminals
 When replacing batteries, use only the same type and number of batteries.
ATTENTION: Risk of explosion if batteries are replaced by an incorrect type
For correct interconnection of the batteries, refer to the wiring diagrams available to service personnel only or to the battery kit
installation manual.
BATTERY MAINTENANCE
WARNING: HAZARDOUS VOLTAGE INSIDE!
Never open the cover of the battery compartment for any reason. If any anomaly is noted, please
contact the service department.
In order to preserve a high level of efficiency and a good lifespan, the batteries must be periodically charged using the CSS itself.
Batteries are subject to self-discharge. If the internal batteries or the Battery Cabinets are stocked and not immediately installed, a full
charge must be performed.
In order to re-charge the batteries, it is required to connect the Battery Cabinet or the batteries internal to the CSS unit for at least
24hrs in “NORMAL MODE” or “STAND-BY CB ON”.
If a long battery stocking period is planned, please contact the service department.

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SENTRYUM EMERGENCY SUPPLY THREE PHASE - CBT
EXTERNAL PROTECTIVE DEVICES
RCD BREAKER (RESIDUAL CURRENT DEVICE)
If an input isolation transformer is not present, the neutral from the mains power supply is connected to the CSS output neutral. As a
result, there will be no change to the neutral arrangements of the installation:
THE CSS INPUT NEUTRAL IS CONNECTED TO THE CSS OUTPUT NEUTRAL
THE DISTRIBUTION SYSTEM THAT POWERS THE CSS IS NOT MODIFIED BY THE CSS
The neutral condition is only modified if an isolation transformer is present or when the CSS works with the neutral
isolated upstream.
Make sure that the equipment is properly connected to the input neutral, otherwise serious damage can occur
to the CS
S
.
During normal operation, when the mains supply is present, an RCD breaker at the input of the CSS will activate if a fault occurs at
the output side, since the output circuit is not isolated from the input.
In any case, other RCD breakers may still be installed at the output, preferably in coordination with those present at the input.
The earth leakage current may exceed 3.5mA (max 15mA), so the RCD breaker located upstream must have the following
characteristics:
 Differential current adjusted to the sum of CSS + Load; we recommend keeping a suitable margin to prevent nuisance tripping
(100mA min. - 300mA recommended)
 Type B
 Delay of at least 0.1s
NOTE for DUAL INPUT connection:
1. A single RCD breaker must be installed upstream at the point where the sources divide to supply the standard input and the
bypass input of the CSS (refer to Table 11).
2. If the standard input and the bypass input are supplied from two separated sources, then it is required to use a dedicated
RCD device for each source.
BACKFEED PROTECTION
The CSS has an internal protection against backfeed. This protection acts by means of a sensing circuit which turns the inverter off if
a fault within the static switch is detected. During this condition, to avoid interrupting the supply to the connected load, the CSS
switches to the bypass line.
If this fault occurs during battery operation, the inverter is stopped.
A volt free contact can be configured to drive a disconnecting device to be installed upstream of the bypass input to the CSS, in this
case when a backfeed fault occurs, the system opens the external disconnecting device, hence avoiding the requirement to stop the
inverter (refer to the user manual to configure this option).
The label supplied with the CSS named “Risk of Voltage Backfeed” and included in the accessory box, must be affixed
to all disconnectors installed within the electrical system upstream of the CSS.

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THERMAL-MAGNETIC CIRCUIT BREAKERS
As previously explained, the CSS has protection devices for output faults as well as for internal faults.
In order to configure the power source, a thermal-magnetic switch must be installed upstream of the CSS.
Please follow the indications in the table below:
Automatic external protective devices Table 3
CSS model Mains input Bypass Input (DI version)
10 40A (trip characteristic curve “C”) 40A (trip characteristic curve “C”)
15 – 20 50A (trip characteristic curve “D”) 50A (trip characteristic curve “D”)
If the protective device upstream of the CSS interrupts the neutral wire, it must also interrupt all of the phase wires at
the same time (4-pole breaker).
Please select the thermal-magnetic circuit breakers in accordance with the “SHORT CIRCUIT WITHSTANDING” below.
Output protections (recommended values for selectivity) Table 4
Normal fuses (GI) In (Nominal current)/4
Normal switches (C curve) In (Nominal current)/4
Ultra-fast fuses (GF) In (Nominal current)/2
SHORT CIRCUIT PROTECTION
If a failure at the output occurs, the CSS protects itself by limiting the value and duration of the output current (short-circuit current).
These values also depend on the operating status of the CSS at the time of the failure; there are two different scenarios:
 CSS in NORMAL OPERATION with a bypass supply: the load is instantly switched to the bypass line (I2t = 11250 A2s): the
input line is connected to the output without any internal protection (blocked after t > 500ms).
 CSS in BATTERY OPERATION or in NORMAL OPERATION without a bypass supply: the CSS protects itself by supplying
2.7 times the nominal current to the output for the first 200ms, which is then reduced to 1.5 times nominal for 300 ms. After
this time (500 ms) it switches off.
SHORT CIRCUIT WITHSTANDING
This equipment is rated for use in a circuit capable of delivering no more than 6000 symmetrical amperes (6 kA), at 415V maximum.
INTERNAL PROTECTIVE DEVICES
The table below shows the sizes of the switch disconnectors of the CSS and the sizes of the battery fuses: these devices are accessible
from the front.
There is also data in relation to the rating of the internal fuses (not accessible) which protect the input and output lines, along with the
maximum input and rated output currents.
Fuses must be replaced with ones of the same size and the characteristics as indicated in the table below.
Switches and internal protective devices Table 5
Disconnect switches and fuse holders Internal Fuses
CSS model SWIN / SWBYP SWOUT / SWMB SWBATT(*) Rectifier input fuses Battery stage fuses Output fuses
10 63A (4P) 63A (4P) 32A gR 500V
(10x38)
25A FF 500V
(6.3x32)
20A FF 500Vdc
(6.3x32)
20A FF 500V
(6.3x32)
15 63A (4P) 63A (4P) 50A gR 500V
(14x51)
2x25A FF 500V
(6.3x32)
32A gR 500V
(10x38)
2x20A FF 500V
(6.3x32)
20 63A (4P) 63A (4P) 50A gR 500V
(14x51)
2x25A FF 500V
(6.3x32)
32A gR 500V
(10x38)
2x20A FF 500V
(6.3x32)
(*) Warning: SWBATT disconnect only the batteries contained in the CSS cabinet

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POWER CONNECTION INFORMATION
INPUT AC Line Connection 3PH + N + PE Table 6
CSS
size
[kVA]
Max
current
[A]
Terminal L1, L2, L3, N PE Suggested wire L1, L2, L3, N, PE (*)
Maximum
cross section
[sqmm]
Max Tightening
torque
[Nm]
Bolt
size
Cross sectional area
L1, L2, L3
[N x sqmm]
Cross sectional area
N, PE (**)
[N x sqmm]
Type
10 21 10 1.9 M6 1 x 2.5 1 x 4 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
15 31.5 16 3 M6 1 x 4 1 x 6 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
20 40 16 3 M6 1 x 6 1 x 10 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
BYPASS AC Line Connection 3PH + N + PE (Dual Input) Table 7
CSS
size
[kVA]
Max
Continuous
current
[A]
Terminal L1B, L2B, L3B, N PE Suggested wire L1B, L2B, L3B, N, PE (*)
Maximum
cross section
[sqmm]
Tightening
torque
[Nm]
Bolt
size
Cross sectional area
L1B, L2B, L3B
[N x sqmm]
Cross sectional area
N, PE (**)
[N x sqmm]
Type
10 16 10 1.9 M6 1 x 2.5 1 x 4 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
15 24 16 3 M6 1 x 4 1 x 6 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
20 32 16 3 M6 1 x 6 1 x 10 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
OUTPUT AC Line Connection 3PH + N + PE Table 8
CSS
size
[kVA]
Nominal
current In
[A]
Terminal L1, L2, L3, N PE Suggested wire L1, L2, L3, N, PE] (*)
Maximum
cross section
[sqmm]
Tightening
torque
[Nm]
Bolt
size
Cross sectional area
L1, L2, L3
[N x sqmm]
Cross sectional area
N, PE (**)
[N x sqmm]
Type
10 14.5 10 1.9 M6 1 x 2.5 1 x 4 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
15 22 16 3 M6 1 x 4 1 x 6 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
20 29 16 3 M6 1 x 6 1 x 10 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
Input Battery DC Line Connection BATT+, BATT-, BATT N, PE (Nominal voltage +240V, -240V) Table 9
CSS
size
[kVA]
Rated Current [A] Terminal
BATT +, BATT -, BATT N PE Suggested wire BATT +, BATT -, BATT N, PE (*)
@nominal
battery
voltage
@end of
discharge
voltage
Maximum
cross section
[sqmm]
Tightening
torque
[Nm]
Bolt size
Cross sectional area
+, -, N, PE (**)
[N x sqmm]
Type
10 22 27.5 10 1.9 M6 1 x 6 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
15 33 41 16 3 M6 1 x 10 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
20 44 55 16 3 M6 1 x 16 FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
(*) The suggested cross section refers to 90°C rated cables with an ambient temperature of 30°C. If different cables are used, or
installed at a higher ambient temperature, the cable size needs to be reviewed.
The cross sections indicated in the table refer to a maximum length of 10 metres
(**) We recommend using at least two PE connection cables. If only one cable is used, it must have a minimum section of 10 mm².

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ELECTRICAL CONNECTIONS (CBT)
WARNING: a 4-wire three-phase distribution system is required.
The CSS must be connected to a power supply source providing 3-phase + neutral + PE (protective earth) of a TT, TN
or IT type. The phase rotation must be correct.
In the IT system a 4-pole thermal-magnetic circuit breaker is mandatory.
Optional TRANSFORMER BOXES to convert the distribution systems from 3-wire to 4-wire are available upon request.
WIRING DIAGRAMS FOR CONNECTING TO THE ELECTRICAL SYSTEM
CSS w/o any variation in the neutral condition CSS with galvanic isolation at the output
CSS with galvanic isolation at the input
* LVS: low voltage source Table 10
Protective devices must be present on both the main input supply and the bypass supply.
Note: the neutral of the input and the bypass supplies are connected together inside the equipment, therefore they must be referenced
to the same potential. If the two power supplies are different, an isolation transformer has to be used on either of the two inputs.
CSS with galvanic isolation
CSS with galvanic isolation at the input CSS with galvanic isolation at the Bypass input
* LVS1: low voltage source 1; LVS2: low voltage source 2; Table 11

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SENTRYUM EMERGENCY SUPPLY SINGLE PHASE - CBM
EXTERNAL PROTECTIVE DEVICES
RCD BREAKER (RESIDUAL CURRENT DEVICE)
If an input isolation transformer is not present, the neutral from the mains power supply is connected to the CSS output neutral. As a
result, there will be no change to the neutral arrangements of the installation:
THE CSS INPUT NEUTRAL IS CONNECTED TO THE CSS OUTPUT NEUTRAL
THE DISTRIBUTION SYSTEM THAT POWERS THE CSS IS NOT MODIFIED BY THE CSS
The neutral condition is only modified if an isolation transformer is present or when the CSS works with the neutral
isolated upstream.
Make sure that the equipment is properly connected to the input neutral, otherwise serious damage can occur
to the CS
S
.
During normal operation, when the mains supply is present, an RCD breaker at the input of the CSS will activate if a fault occurs at
the output side, since the output circuit is not isolated from the input.
In any case, other RCD breakers may still be installed at the output, preferably in coordination with those present at the input.
The earth leakage current may exceed 3.5mA (max 15mA), so the RCD breaker located upstream must have the following
characteristics:
 Differential current adjusted to the sum of CSS + Load; we recommend keeping a suitable margin to prevent nuisance tripping
(100mA min. - 300mA recommended)
 Type B
 Delay of at least 0.1s
NOTE for DUAL INPUT connection:
1. A single RCD breaker must be installed upstream at the point where the sources divide to supply the standard input and the
bypass input of the CSS (refer to 22).
2. If the standard input and the bypass input are supplied from two separated sources, then it is required to use a dedicated
RCD device for each source.
BACKFEED PROTECTION
The CSS has an internal protection against backfeed. This protection acts by means of a sensing circuit which turns the inverter off if
a fault within the static switch is detected. During this condition, to avoid interrupting the supply to the connected load, the CSS
switches to the bypass line.
If this fault occurs during battery operation, the inverter is stopped.
A volt free contact can be configured to drive a disconnecting device to be installed upstream of the bypass input to the CSS, in this
case when a backfeed fault occurs, the system opens the external disconnecting device, hence avoiding the requirement to stop the
inverter (refer to the user manual to configure this option).
The label supplied with the CSS named “Risk of Voltage Backfeed” and included in the accessory box, must be affixed
to all disconnectors installed within the electrical system upstream of the CSS.
THERMAL-MAGNETIC CIRCUIT BREAKERS
As previously explained, the CSS has protection devices for output faults as well as for internal faults.
In order to configure the power source, a thermal-magnetic switch must be installed upstream of the CSS.
Please follow the indications in the table below:
Automatic external protective devices Table 12
CSS Model Mains input Bypass Input (P+N)
Single-phase input (P+N) Three-phase input (3P+N)
6 63A (trip characteristic curve “C”) 20A (trip characteristic curve “C”) 40A (trip characteristic curve “D”)
8 80A (trip characteristic curve “C”) 25A (trip characteristic curve “C”) 50A (trip characteristic curve “D”)
10 80A (trip characteristic curve “C”) 40A (trip characteristic curve “C”) 63A (trip characteristic curve “C”)
15 100A (trip characteristic curve “C”) 50A (trip characteristic curve “D”) 100A (trip characteristic curve “C”)
20 125A (trip characteristic curve “C”) 50A (trip characteristic curve “D”) 100A (trip characteristic curve “C”)
If the protective device upstream of the CSS interrupts the neutral wire, it must also interrupt all of the phase wires at
the same time (4-pole breaker).
Please select the thermal-magnetic circuit breakers in accordance with the “SHORT CIRCUIT WITHSTANDING” below.

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Output protections (recommended values for selectivity) Table 13
Normal fuses (GI) In (Nominal current)/4
Normal switches (C curve) In (Nominal current)/4
Ultra-fast fuses (GF) In (Nominal current)/2
SHORT CIRCUIT PROTECTION
If a failure at the output occurs, the CSS protects itself by limiting the value and duration of the output current (short-circuit current).
These values also depend on the operating status of the CSS at the time of the failure; there are two different scenarios:
 CSS in NORMAL OPERATION with a bypass supply: the load is instantly switched to the bypass line (I2t see table below):
the input line is connected to the output without any internal protection (blocked after t > 500ms).
CSS (kVA) I2t [A2s] Table 14
6 - 8 - 10 20000
15 - 20 35000
 CSS in BATTERY OPERATION or in NORMAL OPERATION without a bypass supply: the CSS protects itself by supplying
2.7 times the nominal current to the output for the first 200ms, which is then reduced to 1.5 times nominal for 300 ms. After
this time (500 ms) it switches off.
SHORT CIRCUIT WITHSTANDING
This equipment is rated for use in a circuit capable of delivering no more than the current as per the table below at 240V maximum.
CSS (kVA) Short circuit symmetrical amperes WITHSTANDING Table 15
6 - 8 - 10 6000 (6 kA)
15- 20 10000 (10 kA)
INTERNAL PROTECTIVE DEVICES
The table below shows the sizes of the switch disconnectors of the CSS and the sizes of the battery fuses: these devices are accessible
either from the front.
There is also data in relation to the rating of the internal fuses (not accessible) which protect the input and output lines, along with the
maximum input and rated output currents.
Fuses must be replaced with ones of the same size and the characteristics as indicated in the table below.
Switches and internal protective devices Table 16
Disconnect switches and fuse holders Internal Fuses
CSS
model SWIN SWOUT / SWBYP / SWMB SWBATT(*) Rectifier input fuses Battery stage fuses Output fuses
3P+N P+N
6 63A (4P) 63A (2P) 32A gG 400V
(10x38)
25A FF 500V
(6.3x32)
3x25A FF 500V
(6.3x32)
20A FF 500Vdc
(6.3x32)
2x20A FF 500V
(6.3x32)
8 63A (4P) 63A (2P) 32A gG 400V
(10x38)
25A FF 500V
(6.3x32)
3x25A FF 500V
(6.3x32)
20A FF 500Vdc
(6.3x32)
2x25A FF 500V
(6.3x32)
10 63A (4P) 63A (2P) 32A gG 400V
(10x38)
25A FF 500V
(6.3x32)
3x25A FF 500V
(6.3x32)
20A FF 500Vdc
(6.3x32)
4x20A FF 500V
(6.3x32)
15 125A (4P) 100A (2P) 50A gG 400V
(14x51)
2x25A FF 500V
(6.3x32)
6x25A FF 500V
(6.3x32)
32A gR 500V
(10x38)
6x20A FF 500V
(6.3x32)
20 125A (4P) 100A (2P) 50A gG 400V
(14x51)
2x25A FF 500V
(6.3x32)
6x25A FF 500V
(6.3x32)
32A gR 500V
(10x38)
6x20A FF 500V
(6.3x32)
(*) Warning: SWBATT disconnect only the batteries contained in the CSS cabinet

- 13 -
POWER CONNECTION INFORMATION
INPUT AC Line Connection 3PH + N + PE Table 17
CSS
size
[kVA]
Max current [A] Terminal L1, L2, L3, N PE Suggested wire L1, L2, L3, N, PE (*)
PH + N
connection
3PH + N
connection
Max cross
section
[sqmm]
Max
Tightening
torque
[Nm]
Bolt
size
Cross
sectional area
L2, L3
[N x sqmm]
Cross
sectional area
L1, N, PE (**)
[N x sqmm]
Type
6 43 14 16 3 M6 1 x 2.5 1 x 10
FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
8 53 17.5 16 3 M6 1 x 2.5 1 x 10
10 63 21 16 3 M6 1 x 2.5 1 x 10
15 94.5 31.5 35 5 M6 1 x 4 1 x 16
20 120 40 35 5 M6 1 x 6 1 x 25
BYPASS AC Line Connection PH + N + PE (Dual Input) Table 18
CSS
size
[kVA]
Max
Continuous
current
[A]
Terminal L1B, N PE Suggested wire L1B, N, PE (*)
Maximum cross
section
[sqmm]
Tightening torque
[Nm] Bolt size
Cross sectional area
L1B, N, PE (**)
[N x sqmm]
Type
6 29 16 3 M6 1 x 10
FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
8 38 16 3 M6 1 x 10
10 48 16 3 M6 1 x 10
15 72 35 5 M6 1 x 16
20 96 35 5 M6 1 x 25
OUTPUT AC Line Connection PH + N + PE Table 19
CSS
size
[kVA]
Nominal
current In
[A]
Terminal L, N PE Suggested wire L, N, PE (*)
Maximum cross section
[sqmm]
Tightening torque
[Nm] Bolt size
Cross sectional area
L, N, PE (**)
[N x sqmm]
Type
6 26 16 3 M6 1 x 10
FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
8 34.8 16 3 M6 1 x 10
10 43.5 16 3 M6 1 x 10
15 65.2 35 5 M6 1 x 16
20 87 35 5 M6 1 x 25
Input Battery DC Line Connection BATT+, BATT-, BATT N, PE (Nominal voltage +240V, -240V) Table 20
CSS
size
[kVA]
Rated Current [A] Terminal
BATT +, BATT -, BATT N PE Suggested wire BATT +, BATT -, BATT N, PE (*)
@nominal
battery
voltage
@end of
discharge
voltage
Maximum
cross section
[sqmm]
Tightening
torque
[Nm]
Bolt size
Cross sectional area
+, -, N, PE (**)
[N x sqmm]
Type
6 13 16.5 10 1.9 M6 1 x 6
FG16R16-0,6/1 kV (90°C)
or FG7R (90°C)
8 17.5 22 10 1.9 M6 1 x 6
10 22 27.5 10 1.9 M6 1 x 6
15 33 41 16 3 M6 1 x 10
20 44 55 16 3 M6 1 x 16
(*) The suggested cross section refers to 90°C rated cables with an ambient temperature of 30°C. If different cables are used, or
installed at a higher ambient temperature, the cable size needs to be reviewed.
The cross sections indicated in the table refer to a maximum length of 10 metres
(**) We recommend using at least two PE connection cables. If only one cable is used, it must have a minimum section of 10 mm².

- 14 -
ELECTRICAL CONNECTIONS (CBM)
WARNING: a 4-wire three-phase distribution system is required.
The CSS must be connected to a power supply source providing 3-phase + neutral + PE (protective earth) of a TT, TN
or IT type. The phase rotation must be correct.
In the IT system a 4-pole thermal-magnetic circuit breaker is mandatory.
Optional TRANSFORMER BOXES to convert the distribution systems from 3-wire to 4-wire are available upon request.
WIRING DIAGRAMS FOR CONNECTING TO THE ELECTRICAL SYSTEM
NOTE: within the following diagrams, the symbol denotes a three-phase connection and the symbol denotes a single-phase connection.
CSS w/o any variation in the neutral condition CSS with galvanic isolation at the output
CSS with galvanic isolation at the input
* LVS: low voltage source Table 21
Protective devices must be present on both the main input 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 are different, an isolation transformer has to be used on either of the inputs.
CSS with galvanic isolation
CSS with galvanic isolation at the input CSS with galvanic isolation at the Bypass input
* LVS1: low voltage source 1; LVS2: low voltage source 2; Table 22

- 15 -
CSS COMMISSIONING
NOTE: some images contained in this document are for information purposes only and may not faithfully demonstrate the
parts of the product they represent.
CSS CABINET POSITIONING
When positioning, take into account that:
- the wheels are to be used for final positioning only. Suitable moving equipment must be used to transport the CSS near to the final
position.
- plastic parts and the door are not able to act as pushing points or handles.
- Ensure that there is sufficient free space in front of the CSS for user operation and maintenance (≈1.5 m).
- no objects should be placed on the upper part of the CSS.
WARNING!
The CSS must be positioned on a level floor.
Ensure that the floor can support the total weight of the system (refer to the table within “INSTALLATION
ENVIRONMENT”).
If side access isn’t available take care during the installation to leave sufficient cable to pull the CSS out for maintenance
purposes.
Do not place any objects on the top. Do not climb up on the CSS. The chassis isn’t designed to hold up the weight of a
person.
After positioning, if required, re-use the bracket which fastened the CSS to the pallet to anchor the CSS to the floor (refer to “POWER
CONNECTION INSTALLATION” for details).
This central supply system (CSS) conforms to all binding safety and electromagnetic compatibility regulations applicable to this type
of product. Compliance with these regulations has been certified by accredited third-party bodies.
In addition to that prescribed in the directives, during the design phase Riello UPS made every effort to assess and eliminate or
minimise all risks deriving both from correct use and possible reasonably foreseeable incorrect operations.
Civil society and the institutions place special emphasis on protecting certain categories of people (pregnant women, minors, people
with cognitive and/or motor disabilities, people wearing pacemakers).
That being said, despite the fact that the CSS is a product reserved for professional and non-domestic use, the above-mentioned
people must not access the areas where the CSS is installed.
Moreover, the CSS must be installed in an area that cannot be accessed by domestic animals or where the latter cannot station in.

- 16 -
POSITIONING INFORMATION
FRONT VIEW REAR VIEW
TOP VIEW BOTTOM VIEW

- 17 -
SIDE VIEW
POWER CONNECTION INSTALLATION
BEFORE ANY OPERATION, LOCK THE
FRONT WHEELS USING THE
SPECIFIC SCREW

- 18 -
REMOVE THE FRONT TERMINAL COVER
CUT A SUITABLE HOLE IN THE
CABLE GLANDS PROVIDED TO
MAINTAIN THE REQUIRED
DEGREE OF PROTECTION
A. PE CONNECTION
B. TERMINAL BLOCKS (FOR MORE INFORMATION REFER TO “POWER CONNECTION DETAILS”)
C. CABLE SECURING BRACKET