Text for tenders: Static, modular rack-mounted three-phase UPS system


Static, modular rack-mounted three-phase UPS system

for redundant operation,

with distributed electronic bypass switching equipment

Integrated battery packs in the UPS enclosure





Rated power consumption: 10 kW to 40 kW n+1 (up to 60

kW)





Principle of operation



To prevent disturbances and irregularities in the

public power supply network from reaching

voltage-sensitive consumers, a static uninterruptible

power supply (UPS) system should be deployed.



It is realised as 10-40 kW n+1 redundant system that

consists of 1 to 3 parallel-switched 10 kW or 20 kW

rack-mounted modules. It must be able to be

individually customised to the consumer independent of

the power required in the final configuration and be

expandable to cater for increased power requirements.

The redundancy is achieved by one more UPS module

being installed than required for the connected

consumer power.



This requires that each parallel-switched rack module

be completely autonomous through the provision of a

distributed parallel architecture and have its own

control and bypass system (bypass circuit-breaker). As

consequence, a central shared bypass nor central open-

and closed-loop control circuits are not permitted.

For availability reasons, each rack-mounted module

must have its own display.



Each module must consist of the rectifier, booster,

inverter, battery circuit, DC converter for the

ripple-free battery charging, display unit and

electronic bypass functional units.



To simplify the handling, the UPS modules must be

implemented with rack-mounted technology and installed

in system enclosures. The enclosures must be

constructed so that as many as three UPS modules can

be installed in each enclosure. The required battery

packs must also be included in the UPS enclosure. The

input and output terminals, parallel disconnectors and

manual override (isolation switch) are located in the

lower enclosure unit.



A side-mounted air/water heat-exchanger matched to the

maximum heat dissipation must be available as option.



To achieve the highest availability of the UPS system,

it must be guaranteed that the replacement of a

rack-mounted module does not result in on-site

recovery time lasting more than half an hour.



To provide the best possible power supply reliability

for the connected consumers, only those systems that

operate with the continuous converter principle

(online operation) in accordance with the

classification VFI-SS-111 (voltage and frequency

independent) as prescribed by EN 62040-3 are approved.



When mains supply voltage is present, the consumer is

continually provided with power from the rectifier,

the booster and the inverter. At the same time, the

battery circuits are supplied with ripple-free

trickle-charging current so that the complete battery

capacity is available should mains power fail.



In case of a power failure, the energy supply for the

inverter is provided without interruption within the

specified stored energy time from the batteries or for

the time until the public power supply system returns

or an emergency power supply system supplies power to

the rectifier. The DC converter then automatically

recharges the batteries within an appropriate time.



The circuits at the mains input to the UPS must be

designed to produce a sinusoidal current with a load

factor of 0.99. This avoids the overdimensioning of

any upstream emergency generating unit (such as a

diesel generator). To minimise the energy costs, it

must be guaranteed that the permitted mains distortion

remains less than 3% at the input without requiring

12-pulse technology, filters or transformers. To

achieve optimum efficiency over the complete load

range, only transformer-free UPS systems are

permitted.



The inverter creates a stabilised alternating current

with constant frequency from the direct voltage. Mains

power disturbances must not affect the inverter output

voltage and even a total failure of the mains power

must remain without effect on the connected load.



The inverter output power is designed to handle a cos

phi apparent power factor of 0.9, where the specified

kilowatt power from 0.9 capacitive to 0.8 inductive

must be available without power reduction. If this is

not the case, it must be guaranteed that the inverter

is capable of supplying the active and apparent power

as prescribed in the specification.



Each UPS rack-mounted module must have a user-friendly

menu-prompted LC display with at least two lines (40

characters) for operating the system.  This display is

used to control the system and it must permit access

to the event register and the service mode. The

display must also provide LEDs for the current flow

and operational display as well as the appropriate

pushbuttons for the control and the menu prompting. It

must be guaranteed that the percentage load display

applies to the taken active power; the active power,

the apparent power and the reactive power must be

shown on the display.

It must be possible to specify at least German,

English and French as menu languages.



For availability reasons,  a replacement of a

defective UPS rack-mounted module in a redundant

configuration must be possible during running

operation without switching to the unprotected power

mains and without switching to the mechanical

maintenance bypass or electronic bypass switching

equipment. Similarly, an upgrade of the system with an

additional module must be possible without switching

to bypass.



The battery pack installed in the UPS enclosure must

be optionally available in redundant form; this means

a separate battery circuit for each UPS module. The

UPS system must provide an automatic battery test that

can be initiated regularly in freely-programmed time

intervals. A stationary maintenance-free

valve-regulated lead-acid (VRLA) battery is required

with expected service life: 5 years in accordance with

EUROBAT (optionally, also 10 years in accordance with

EUROBAT).



For operating and follow-on cost reasons, the deployed

battery types must conform to the industrial standard

and must not be a special-purpose product for a

specific UPS brand with regard to size and

connections.



The batteries should be installed in a ventilated UPS

rack so that only a single rack is required at the

installation location. The maximum number of batteries

that can be integrated is 240 units with 12 V / 7 Ah

rating. In general, the battery pack is used for all

installed UPS power modules; a separation into a

maximum of three individual packs with a dedicated

battery pack for each UPS power module should be

possible as option. EN 50272-2 must be observed for

the installation and ventilation of the UPS system.



The UPS system should be contained in a welded sheet

steel enclosure with vented front door and 4-point

locking. A customer-specific semi-cylinder must be

able to be used in the handle. The rear panel provides

ventilation openings and is screwed to the enclosure

frame. As option, the capability must be provided to

install a 100 mm or 200 mm high base/plinth under the

system enclosures. The side panels are screwed on; all

enclosure panels are connected with earthing

conductors to the enclosure frame.



Technical specifications

A static scalable and n+1 redundant UPS constructed as

rack-mounted module.



Performance characteristics,,,,,,,,,,,,Required



UPS classification in accordance with EN 62040-3:,,,,,,

VFI-SS-111

            (voltage- and frequency-independent)



Active power of the complete system for n+1

redundancy:,,,,10-40 kW n+1



Expandable to (without redundancy):,,,,,,,,,,up to 60

kW



Active power per module:,,,,,,,,,,,,10 kW or 20 kW

depending on the

                             ,,,,,,,,,,,,,,module type



Apparent power for cos ? 0.9 cap. to 0.8 ind.

for each module (depending on the deployed module

type):,,,,10 or 20 kVA



Active power for cos ? 0.9 cap. to 0.8 ind. per

module:,,,,,,10 or 20 kW

,,,,,,,,,,,,,,,,

Redundancy capability:,,,,,,,,,,,,,,n+1, n+2



Parallel architecture:,,,,,,,,,,,,,,distributed

            (without additional equipment)



Power increase (without conversion of the UPS system) ,,,,

can be expanded with 10/20 kW

supplementary modules



Max. possible power (without redundancy):,,,,,,,,3

modules, 60 kW



Safety:,,,,,,,,,,,,,,,,,,EN 62040-1-1:2003,

EN 60950-1:2001/A11:2004



EMC:,,,,,,,,,,,,,,,,,,EN 62040-2

EN 61000-3-2:2000,

EN 6100-3-3:1995/A1:2001

EN 61000-6-2:2001

EN 61000-6-4:2001



Operational requirements:,,,,,,,,,,,,EN 62040-3:2001





Display:,,,,,,,,,,,,,,,,LCD, = 40 characters

for apparent power, effective power and reactive power

as well as percentage details of the effective power



Event memory:,,,,,,,,,,,,,,,,= 64 events



Input:,,,,,,,,,,,,,,,,3 x 400 V/230 V (5 conductors,

L1-L3, N, PE)



Tolerance (without battery discharge under load):,,,,=

100% (-25%/+15%)

,,,,,,,,,,,,,,,,< 80% (-30%, +15%)

,,,,,,,,,,,,,,,,< 60% (-40%, +15%)



Input mains frequency:,,,,,,,,,,,,50 Hz



Frequency range without battery discharge:,,,,,,35#70

Hz



THDI distortion factor (input):,,,,,,,,,,< 3% (without

reduction of efficiency)



Input power factor:,,,,,,,,,,,,= 0.99



NEA overdimensioning (approx. factor):,,,,,,,,1.25 x

UPS power



Output:,,,,,,,,,,,,,,400/230 V (5 conductors, L1-L3,

N,PE)



Voltage control:,,,,,,,,,,,,,,< +/- 1%



Output frequency:,,,,,,,,,,,,50 Hz



Frequency stability:,,,,,,,,,,,,<+/- 0.05 Hz

Frequency stability for internal clock rate:,,,,,,<+/-

0.1%



Overload capability:,,,,,,,,,,,,125% for 10 minutes

 ,,,,,,,,,,,,,,,,150% for 60 seconds

,,,,,,,,,,,,,,,,300% for 250 ms



Short-circuit current:,,,,,,,,,,,,3 x Irated for more

than 250 ms



Noise level at 100% load:,,,,,,,,,,= 60 dB(A) at

distance of 1 m

Noise level at 50% load:,,,,,,,,,,= 50 dB(A) at

distance of 1 m



Efficiency at 75% to 100% linear load:,,,,,,,,> 95.5%

Efficiency at 75% to 100% non-linear load:,,,,,,> 95%

Efficiency above 10% linear load:,,,,,,,,= 90% (for

mains disturbances < 5% THDI)

Efficiency in ECO mode,,,,,,,,,,,,= 98%



Maximum heat loss at the rated load (non-linear):,,,,=

1300 W/module

No-load losses:,,,,,,,,,,,,,,= 800 W/module



Air/water heat exchanger as option:,,,,,,,,located at

the side



Stored energy time:,,,,,,,,,,,,>10 minutes at 100 kW

,,,,,,,,,,,,,,,,can be extended later



Battery type:,,,,,,,,,,,,,,VRLA (lead-gel)



Battery size and connections:,,,,,,,,,,standard size



Expected service life (in accordance with EUROBAT),,,,

= 5/10 years at 20°C battery temperature



Battery redundancy (optional):,,,,,,,,,,1 battery pack

per UPS module



Width of the UPS system:,,,,,,,,,,max. 600 mm



Depth:,,,,,,,,,,,,,,,,max. 1000 mm



Height (without base/plinth):,,,,,,,,,,max. 2000 mm



Wall clearance to the UPS rear side,,,,,,,,min. 200 mm



Space requirement in front of the UPS front side,,,,

min. 900 mm



Protection category:,,,,,,,,,,,,IP 20



Storage temperature (without batteries),,,,,,,,-25°C to

+70°C



UPS system ambient temperatures (during operation):,,,,

0°C to +40°C



Battery pack ambient temperatures (recommended):,,,,

+20°C to +25°C



Access for maintenance:,,,,,,,,,,only from the front



Separate power supply for bypass and rectifier:,,,,,,

required



Electronic bypass:,,,,,,,,,,,,1 unit per UPS module



Bypass integrated manually (manual override):,,,,,,

required



Module replacement, maintenance or upgrade

without switching to unprotected mains system

in accordance with availability class Tier IV:,,,,,,

required



On-site restoration duration for module replacement

(MTTR):,,< 0.5 hours



Network card with web interface:,,,,,,,,required as

option

(SNMP or ModBus)



Web-based remote monitoring system:,,,,,,,,required as

option



RS-232 interface:,,,,,,,,,,,,required



USB interface: ,,,,,,,,,,,,,,required



Floating contacts for connection to GLT:,,,,,,required



Management and shutdown software:,,,,,,,,required as

option



Commissioning:,,,,,,,,,,,,required







Type:,,Rittal PMC 40Typ5 Model No.: 7040.060

(UPS basic enclosure prepared for battery integration,

without UPS power modules and battery packs) or

equivalent



Manufacturer: Rittal
Type: Static, modular rack-mounted three-phase UPS system   DK 7040060
or equivalent


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