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Uninterruptible Power Supply

RATED POWER : 320 kVA/320kW – Three-phase

10 min autonomy at 320 kW









5.1.General characteristics 3

5.2.Rectifier 5

5.3.Battery charger 5

5.4.Energy storage 6

5.5.Periodical battery discharge test 6

5.6.Three level IGBT inverter 6

5.7.Automatic static bypass 7

5.8.Manual maintenance bypass built in the UPS 7

5.9.External maintenance manual bypass 7


7.USER INTERFACE, controls and alarms  8





For the purpose of this document, we have used the following standard abbreviations:
UPS Uninterruptible Power Supply

IGBT Insulated Gate Bipolar Transistor

DSP Digital Signal Processor

THDU Total Harmonic Distortion Voltage (Phase/Phase)

THDI Total Harmonic Distortion in Current

VFI Voltage and Frequency Independent

Output Voltage and frequency of the UPS independent from the input voltage and frequency thanks to the double conversion AC/DC & DC/ AC

AC Alternative Current

N Neutral

Generic symbol used for neutral connection

VRLA Valve Regulated Lead Acid

AGM Absorbent Glass Mat

EMC Electro Magnetic Compatibility

IEC International Electrotechnical Commission

EC European Conformity

EN European Norms


Paragraphs shown in red refer to options. They should be deleted if these options are not relevant to the current project.

Text in grey is to be completed, edited or selected according to the needs of the project.

Notes shown in purple are intended for specification users (engineering consultants or Socomec spec engineers).

Delete these notes before the specification is published.

The table of content shall be updated to this personalized specification


This specification document describes the system of ..n.. double conversion Uninterruptible Power Supply system(s) (hereafter referred to as UPS) sized to the unitary ouput power factor.

The system must provide high quality power to protect sensitive equipment which maximum power is …. kVA, …. kW.

The technical reference is SOCOMEC UPS Green Power 2.0, 320 kVA/kW of rated power and system-installed as a standalone unit / redundant (1+1) / parallel / parallel redundant (N+1) or as a similar solution approved by us.

If case of several modules in parallel, please make sure you clearly specify the number of units included in the system.

If case of several parallel systems, please make sure you clearly specify the number of systems.

The system must comply with the following UPS standards:

  • Safety : EN / IEC 62040-1.

  • EMC Emission : EN / IEC 62040-2 class C3.

  • EMC Immunity : EN /IEC 62040-2 classes C2-C3.

  • Test and performances: EN /IEC 62040-3.

A performance certificate from a third party major certification body must be supplied upon the first request.

This will allow checking several performances in real installation condition of use, such as:

  • Efficiency measured at different load rates and types (resistive, inductive, capacitive)

  • Power factors and input THD

  • Inverter output Short-circuit current values

The UPS must be developed, manufactured and tested in a European country (France). The development and the production site must be certified according to ISO14001 (Environmental management system) and ISO 9001 (Quality management system).

The UPS covered by this specification must have the EU marking, in accordance with European directive on safety and electromagnetic: 2014/35/UE (Low voltage directive) et 2014/30/UE (EMC). Relevant documentation and certificates must be made available on request.

Each UPS must include the following sub-assemblies:

  • Rectifier

  • Battery charger

  • Battery storage 

  • Inverter

  • Automatic static by-pass

  • Maintenance manual by-pass built in the UPS (for redundant 1+1 and unitary UPS)

  • External manual maintenance by-pass in a separate cabinet

    1. General characteristics


  • Operating temperature range : from 0°C up to + 40°C

  • Storage temperature range  : from -20°C up to + 70°C

  • Altitude, without derating : ≤1000m,

  • Maximum relative humidity : 95 % at room temperature, without condensation

The UPS must be designed to be able to supply the latest generation of loads with unitary output power factor (pf =1), without derating the power of the UPS.

Each UPS module must comply with the following key technical specifications:

Apparent rated power

320 kVA

Active rated power (Pn)

In accordance with EN/IEC 62040-3 standard

320 kW

Type of network (input/output)

Three-phase / Three-phase

UPS classification according EN/IEC 62040-3

VFI - SS – 111

AC/AC total efficiency in double conversion mode (VFI mode, according IEC/EN 62040)

Up to 96,0 %

Verified and attested by an accredited

and independent certification body

Number of network inputs

Separate by-pass and rectifier network/ common

Rated input voltage

380 - 400 - 415 V

Rated input frequency

50 / 60 Hz

Rated output voltage

380-400-415 V sinusoidal

Rated output frequency

50 / 60 Hz

Acoustic pressure measured with a rated load and at a distance of 1 m (according to ISO 3746)

 68 dBA

Dimensions of a UPS module (WxDxH in mm)


Weight of a UPS module

1000 kg

Protection Index according to EN/IEC 60529-2

IP 20

For parallel systems, it will be possible to optimize the energy consumption by automatically adjusting the number of units coupled to the load when the installation is operating at partial load. In case of low load level, the over redundant modules are turned to “hot stand-by”. The load sharing will be balanced between the remaining still working in online double conversion (VFI-SS-111). Combined with low “stand-by units” power consumptions, the load rate increase on each available unit will result to the global efficiency improvement

For maximum power availability, this mode will be active in normal operation (no alarm present, input networks present and within tolerance). Equalization of operating hours of each unit will ensure a uniform aging of system components.

Automatic system transfer on bypass (eg in case of downstream short-circuit) instantly reactivate the static switch of all the units to take advantage of the overall system capability.

The activation / inhibition of this management function must be available to the user through the display / keypad interface.
    1. Rectifier

The UPS rectifier must be equipped with a load break switch. The rectifier has to be protected by a current limiter and it must be possible to operate the rectifier with an incorrect input phase transposition.

Rectifier bridge technology and topology

DSP control - three level IGBT

Rated voltage

400 V - 3 ph (without required neutral)

Voltage tolerance (without the use of batteries)

400V+20/-15% at 320 kW

400V -25 % at 288 kW

400V -50 % at 176 kW

Frequency range

42 - 65 Hz

Input power factor at full load

(without active or passive filters)

≥ 0,99

Input power factor at 30% load

(without active or passive filters)

≥ 0,99

Input Harmonic distortion (THDi) at full load (without active or passive filters)

 2,5 %

Input Harmonic distortion (THDi) at 30% load (without active or passive filters)

 5 %

Soft-start current ramping for generator compatibility (power walk-in)

100 A /sec. in standard

Can be customized from 20 to 2000 A/sec.

Automatic restart delay (input voltage recover)

Can be customized up to 3000 sec. with 1 sec steps
    1. Battery charger

The system must have a charger that manages the battery according the battery supplier recommendations.

A sensor to measure the temperature of the battery shall be provided and connected to the UPS

To maximize the battery lifetime, its voltage must be independent from DC bus which is generated by the rectifier and must have the following performances:

Charging current

0,1 C10

Floating voltage

Adjusted according to temperature

The UPS will be capable of charging the battery in sustained floating mode and will automatically switch to intermittent charging mode if necessary. The temperature threshold for switching from one mode to the other will be configurable. This function can also be inhibited.

For parallel systems, it must be possible to manage:

  • Distributed battery connection: one set per UPS module,

  • Shared battery connection: one set for several modules or for the entire parallel UPS system. Its charge will be managed by the complete system to ensure the current will automatically comply with the battery supplier recommendations if one or several UPS modules are not available.

It must be possible to connect the battery of an added module by increasing the capacity of the entire system battery or keeping the new battery set dedicated to the added UPS module.
    1. Energy storage

The UPS must be able to be connected to a two poles (+/-) energy accumulator which must guarantee a backup life of minutes at end of life at a load of ... kW.

It will be a sealed lead-acid and maintenance-free battery (VRLA) / AGM technology / sealed lead-acid and maintenance-free battery (VRLA) gel technology / lead-acid unsealed battery / NiCd battery, with a rated life of 10-12 years according to EUROBAT / > 12 years according to EUROBAT at 20°C

Batteries will be supplied and installed in a separate metallic cabinet / on shelves with an acid container / on shelves without an acid container. The battery calculation sheet will be attached to the offer, specifying the rated output power (kW), the inverter efficiency and the voltage at the end of discharge.

The UPS must also be compatible with kinetic energy storage solutions (flywheel).

Please contact us to define a suitable specification
    1. Periodical battery discharge test

The system should include the ability to perform battery discharge tests without the use of an external resistive load or any special infrastructure. The UPS will therefore be able to inject the energy stored in the batteries to the upstream distribution of the UPS to be absorbed by other power consumers

The battery will be performed at a constant power (full power or partial load, configurable through the manufacturer's maintenance software) to validate battery back-up time.

This function must be available on single UPS and on each modules of a parallel system

During the test phase, the energy has to be fed back (optionally):

• Upstream the rectifier, when the UPS is disconnected from the output bus of a parallel system.

• To the load and to the upstream when the UPS supplies the application protected by online double conversion mode.

To ensure safe site operation, the system must take into account the network status to automatically interrupt the test in the absence of main power. In case the output is powered by the unit under test, an interruption of the test will result in the continuity of the power to the critical application, using the remaining stored energy.

The battery will be preserved deep discharge phenomena by automatic test stop
    1. Three level IGBT inverter

The UPS inverter must use IGBT technology with a DSP control and a high switching frequency in order to support important variation of the output load rate.

The inverter must comply with the following specifications:

Inverter topology and technology

IGBT – Thee level

Rated output voltage

3 x 400 V with / without neutral

Rated frequency and tolerance

50 / 60 Hz ± 10 %

Frequency stability (in back-up mode or while auxiliary main is absent)

50 / 60 Hz ± 0,01 %

UPS rated apparent power

320 kVA

Permanent active power available at 35 °C, according to EN/IEC 62040-3

320 kW

Load management without derating within the limits of the rated apparent and active power.

Any load with a power factor of

0.1 inductive to 0.9 capacitive

Output voltage stability in dynamic conditions for a variation between 0 and 100% and vice versa

According to IEC/EN 62040-3.

Class 1 (VFI-SS-111)

Output voltage stability in static mode between 0 to 100% load

 1 % Vn

Total output voltage distortion with a linear load at rated power

THDU ≤1,5 %

Total output voltage distortion - non-linear load according to IEC/EN62040-3

THDU ≤ 3 %

Short circuit current capacity while the auxiliary mains is absent

1600 A during 100ms

Overload capacity for 10 minutes

400 kW

Overload capacity for 60 seconds

480 kW

The inverter must be equipped with its own current limiting algorithm, so components are not damaged in case of an output short-circuit. The UPS must provide a signal making possible to trip the battery protection at the end of the discharge or in case of emergency stop activation.

For systems composed of parallel UPS units, the inverter of each unit will be protected by a group of electronic circuits, fuses and contactors to guarantee its disconnection in case of internal failure.
    1. Automatic static bypass

The bypass ensures the system switches over to the auxiliary source without any interruption in power.

The auxiliary source branch (line) of each UPS module must be equipped with a « Thyristor » static switch sized for a permanent operation at full power. The control logic of the bypass must ensure a no break transfer in case of overload, inverter failure or downstream short circuit. If one of the fans stops, the bypass must continue to be cooled.

Switching time with inverter synchronized to the auxiliary source

No interruption

Overload capability:

  • 1 hour

  • 10 minutes

  • 1 minute

  • 100ms

110 %

125 %

150 %

1000 %

Short circuit capability (without damaging the static switch)

12500 A peak/ 20 ms

For parallel systems, the UPS solution must be available in centralized bypass configuration as well (one by-pass for multiple modules).

Please contact us to define a suitable specification.
    1. Manual maintenance bypass built in the UPS

For single or 1+1 redundant UPS, the manual bypass switch will be fitted in the same cabinet.

It must be possible to switch the load from the bypass static switch to the manual bypass without power interruption, and vice versa.
    1. External maintenance manual bypass

For a parallel or parallel redundant (N+1) UPS, the external manual maintenance bypass switch will be built into an external cabinet and will allow a supply to the load directly by the main source while the rectifier, inverter and by-pass’ static switch are stopped or not active. It must be possible to switch the load from the bypass static switch to the manual bypass without power interruption, and vice versa.

The UPS will allow taking into account the position of an external manual maintenance bypass. This information will be managed by the UPS for safe operation and maintenance activities.

It will be possible to lean the UPS against the wall without any rear clearance requirement:

  • The power and control cables must be connected by the front.

  • The UPS will be cooled with forced ventilation: the air inlet will be on the front panel and the outlet vent will be at the top of the cabinet.

  • Maintenance operations will be done via front access only and the preventive replacement of components for preventive maintenance will be easy to shorten the mean time to repair.

Each unit will be equipped with switches upstream of the rectifier, upstream of the static bypass and at the output: this will allow work on the electronics or power modules to be done in safety when the load is powered via the manual maintenance bypass.
  1. USER INTERFACE, controls and alarms 

The user interface on the UPS must consist of a graphical colour display with the following features:

  • Min. 3,5" screen with High Definition (min. 320x240 pixels), Highly visible, backlit screen

  • Display data on UPS status, measurements, alerts and event logs

With its dedicated input terminal blocks, the system will be able to manage the following external devices/signals:

  • External Emergency stop in order to activate following functions :

    • UPS stop and separation by opening the inverter downstream contactor

    • Static by-pass stop

    • Battery protection tripping (if equipped with a trigger device)

  • Genset, with the option to inhibit battery being recharged when information is active ;

  • Battery protection (open/closed), taking into account the status on the display;

  • Battery temperature, to display on the screen and manage the battery charge;

  • External maintenance bypass (open/closed), to secure manual and automatic operations ;

  • Report the upstream backfeed isolation device position;

  • Trigger the upstream backfeed isolation device if a fault is detected

The following Ethernet communication protocols will be supported as standard:

    • SNMP,

    • HTTP (web page allowing a remote access to the synoptic, state, UPS alarms and measures ,

    • SMTP (Email alert)

It must be possible to configure these protocols via an HTML interface.

The system will provide an alarm synthesis of any faults that could appear on the UPS (general alarm).

It will also have empty slots for additional communication cards to interface with the centralised management system.

As options, following interfaces could be supplied with the UPS or installed later:

  • RS232 or RS485 serial communication cards;

  • In/Out programmable card, with at least 3 inputs and 4 outputs (VFC) by card

Card programming must allow affecting to each output a state or an alarm available inside the system..

  • MODBUS communication card on TCP/IP and server shutdown

The supplier of the equipment must be able to offer factory acceptance tests and in the presence of the customer.

All tests will be carried out with appropriate measuring instruments, their accuracy guaranteed by a certificate of calibration.

Following the positive outcome of the test procedure, the manufacturer shall prepare a certificate listing the tests performed and the results obtained.

After installing the equipment and its power supply, commissioning will be carried out by technicians trained and certified by the UPS manufacturer.

The following steps must be performed on the supplied equipment:

  • Visually inspect of the equipment and the absence of intruding objects,

  • Checking of electrical and mechanical connection,

  • Functional tests to check its operation,

  • Validate the measurements taken during factory testing

  • Load-testing1

  • Install and verify the transfer of data to the supervision station

  • Basic training for system users:

  • General description of how to use the system

  • Instructions on use and maintenance

At the end of the commissioning procedure, the technician will need to create a full report on the work undertaken.

The UPS manufacturer must be able to ensure the maintenance of the installed equipment, by means of a maintenance contract. This should be done by technicians trained and certified by the manufacturer of the equipment.

The manufacturer must be able to provide a remote supervision and diagnostic 24/7/365.

1 The tests may be carried out only with the actual system load or a test load provided by the client.


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