Text for tenders: UPS 30kVA module


UPS 30kVA module

Static, modular and infinitely extendible three-phase

UPS system

for redundant parallel operation

with decentralised electronic bypass

Rated output voltage: 1 x 30 kVA (infinitely

extendible)



Mode of operation

In order to prevent interference and fluctuations of

the public supply network system from the

voltage-sensitive consumers, a static uninterruptible

power supply (UPS system) must be used.



It is a n+1 redundant system consisting of several

parallel connected modules with multiple outputs. It is

individually adjustable to the consumer independent of

the required output in the final assembly and

infinitely extendible in case of increased output

requirements. The redundancy is achieved by installing

one more UPS module than necessary for the connected

consumer output.



For this, every parallel-connected module must be

completely autonomous due to its decentralised parallel

architecture and have its own control and bypass system

(bypass switch), i.e. a central, common bypass or

central control circuits are not allowed.

For reasons of availability each module must have its

own display.



Each module must have the following functional

components: Rectifier, booster, inverter, battery

circuit, DC converter for ripple-free battery charge,

display unit and electronic bypass.



For simple handling the USP modules must be 19 inch

rack-mountable and installed in enclosures. The

enclosures must be assembled so that up to 3 UPS

modules per enclosure can be installed. In the lower

enclosure section battery fuses as well as manual

bypass are arranged. Furthermore there must be the

possibility to connect several enclosures in order to

connect a larger number of UPS modules in a n+1

configuration  and/or to achieve a higher output.



To guarantee the highest possible supply for the

connected consumers only systems operating according to

the continuous transducer principle (on-line operation)

to classification VFI-SS-111 (voltage and frequency

independent) EN 62040-3 are permitted.



In case of existing mains voltage the consumer is

constantly supplied via the rectifier, booster and

inverter. At the same time the battery circuits are

supplied with ripple-free trickle charging so that in

case of power failure the full battery capacity is

instantly available.



In case of a mains failure power is supplied for the

inverter without interruption within the given stored

energy time by batteries or for the time until the

public mains returns or a backup mains system takes

over the power supply of the rectifier.

The DC converter automatically recharges the batteries

in an appropriate time.



The switching circuits at the mains input of the UPS

must be designed so that a sinusoidal current with a

load factor approaching 1 can be achieved.  For this

reason a pre-connected emergency power plant (e.g

diesel generator) must be oversized with a maximum

factor of 1.3 x UPS power. In order to minimise the

energy costs it must be guaranteed that the admissible

mains distortion at the input will be adhered to

without 12-pulse technology or transformers.

Only transformer-free UPS systems will be approved.



The inverter generates from the DC voltage a stabilised

AC voltage with constant frequency.  Mains-borne

interference must not influence the inverter output

voltage and even a total mains failure must not have an

impact on the connected load.



The inverter output power factor is rated to an

apparent power factor cos phi of 0.8. If this is not

the case it must be ensured that the inverter can

supply  the real and apparent power that is required in

the specifications.



A user-friendly, menu-guided  LCD display (40

characters) must be installed for each UPS module for

operating the system. The system must be controlled via

this and access is made to the event register and to

the service mode.



LEDs for current flow display and respective

push-buttons for control and menu navigation must be

provided in the display as well.



An exchange of a defect UPS module in a redundancy

configuration must be possible for reasons of

availability without switching to electronic bypass

connection during operation.



The battery system must be redundant, i.e. one separate

battery circuit per UPS module. The UPS system must

have an automatic battery test that is regularly

started in freely programmable time intervals. A static

maintenance-free closed gas-recombining  lead-acid

battery , service life: 10 years, is required.



The batteries must be accommodated in battery racks

that are adjusted in appearance and design to the UPS

enclosure.

Only reduced ventilation in accordance with VDE 0510 is

allowed, installation must be possible in a naturally

vented room.





Specifications



Static, scalable and n+1 redundant uninterruptible,

power supply . UPS - , modular design.



Requirements

UPS classification in accordance with EN 62040-3:

VFI-SS-111 (independent of voltage and frequency).

Apparent power output: 30 kVA with n+1 redundancy

Real power output: 24 kW

Possible redundancy : n+1 (without retrofitting)

Parallel architecture: decentralised (without

additional equipment)

Power increase by additional modules:

With 30 kVA per step

(without modification of UPS system)

may be infinitely extended.

Maximum output: no restrictions

Security: EN 50091-1

EMC: EN 50091-2

Operational requirements: EN 62040-3

Input: 3x 400/230 V

Tolerance (without battery discharge):

+25 / - 15 %

Mains frequency input: 50 Hz

Frequency range without battery discharge: 35 . 65 Hz

Distortion factor THD (input):

< 10 % (without reducing the operating ratio )

Input power factor: > 0.98

Diesel generator oversize :

Factor <1.3 x UPS power

Output: 400 / 230 V (5 conductors)

Voltage regulation: < +/- 1 %

Output frequency: 50 Hz

Frequency stability: <+/- 0.005 Hz

Frequency stability in case of self pulsing:

<+/- 0.5 %

Overload capacity:

125 % 10 minutes

150 %   1 minute

Noise level at 100 % load: < 55 dB (A) at 1 m

Protection category: IP 20

Operating ratio with 75 % to 100 % linear load: > 95 %

Operating ratio with 75 % to 100 % non linear load: >

93 % ( with mains distortion < 10 % THD)

Maximum heat loss at rated load (non-linear): 1680 W

Stored energy time: variable minutes at full load

Battery type: VLRA

Battery service life (according to Eurobatt) = 10 years

at 20°C

Battery redundancy: 1 Batt circuit per UPS module

Weight incl. batteries: = to configuration

(module 30 kVA 55 kg)

Width including internal battery: 600 mm

Width including external battery rack: 1400 mm

Depth: 1000 mm

Height: 2000 mm

Access for maintenance: only from the front

Electronic bypass:

1 unit per UPS module

Manually integrated bypass

Input distributor with service bypass :

Option

(repair, extension and retrofitting of UPS system

without data centre shutdown)

Network interface card (s) (SNMP or ModBus):

Option

AS/400  interface:

Option

RS-232 interface:

Option

Management and shutdown software:

Option

Setting-up operation:

Option



Manufacturer: Rittal
Type: UPS 30kVA module   DK 7857030
or equivalent


Quantity  Unit         Price Each                 Price Total
   
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