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MASTERYS Green Power 2.0

Uninterruptible power system (UPS)
This document specifies the characteristics of 15 kVA-rated UPS systems to power critical and sensitive equipment in mission-critical and datacenter applications.
This product is not intended to be used as central power supply systems for emergency lighting applications where specific requirements are requested by dedicated application standards or local regulations.

The specification includes footnotes designed to assist in defining data.

These notes can be eliminated by deleting the respective superscript reference numbers.

Parts highlighted in grey are to be filled in, or edited, or selected.


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4 - General description of the static uninterruptible power system Error: Reference source not found

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4.2 – 3-level IGBT rectifier Error: Reference source not found

4.3 – IGBT battery charger Error: Reference source not found

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4.5 – 3-level IGBT inverter Error: Reference source not found

4.6 – Automatic bypass Error: Reference source not found

4.7 – Maintenance bypass Error: Reference source not found

5 - Conformity to standards Error: Reference source not found

6 – Construction specifications Error: Reference source not found

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1 – Area of application of the specification

This technical specification describes the supply and installation of .. uninterruptible power systems (hereinafter called UPS) of high double-conversion efficiency (3-level technology rectifier and inverter) and unitary output power factor (KW = KVA).

As a technical reference, the SOCOMEC Masterys Green Power UPS 2.0 with a rated power of

15 kVA, and single / parallel architecture has been selected.

The runtime of the accumulator banks in each UPS will not be less than …. minutes at loads of 15kW.

The UPS must be manufactured in an EU country.

The technical specification defines:

  • the technical specifications of the supply and the installation procedure;

  • the acceptance tests and inspections to be run on the equipment at the manufacturer’s premises;

  • details to be indicated in the bid.

The bidder must fill out the bid in full compliance with the contents of this specification. Any changes and/or deviations to/from the specified features must be clearly indicated in the bid; where no deviations are declared, it shall be assumed that all the technical characteristics listed herein are satisfied.

2 – Reference standards

Unless otherwise specified, the supply shall conform to the following standards in full:

  1. Standard EN 62040-1-1 - Uninterruptible power systems (UPS) Part 1-1 General and safety requirements for UPS used in operator access areas;

  2. Standard EN 62040-1-2 - Uninterruptible power systems (UPS) Part 1-2 General and safety requirements for UPS used in restricted access locations;

  3. Standard EN 62040-2 - Static uninterruptible power systems (UPS) Part 2 Electromagnetic compatibility (EMC) requirements;

  4. Standard EN 62040-3 - Static uninterruptible power systems (UPS) - Methods of specifying the performance and test requirements

  5. Standard EN 50272-2 - Safety requirements for secondary batteries and battery installations - Part 2: Stationary batteries;

  6. Standard EN 60896-11 Lead acid stationary accumulator batteries. General requirements and methods of test. Part 1: Vented types.

  7. Standard EN 60896-21 - Lead acid stationary batteries, part 21: valve-regulated types - Test methods;

  8. Standard EN 60896-22 - Lead acid stationary batteries, part 22: valve-regulated types - Requirements;

  9. Standard EN 60146-1-1 - Semiconductor converters - General requirements and line commutated converters - Part 1-1: Specifications of basic requirements

  10. EN 60950-1 - Information technology equipment - Safety Part 1: General requirements.

  11. ISO 3746 - Acoustics - Determination of sound power levels of noise sources using sound pressure - Survey method using an enveloping measurement surface over a reflecting plane.

  12. Standard EN 60529-2 (Europe). Protection levels of enclosures (IP rating).

  13. Standards ASTM D999 and D800 and AFNOR NF H 00-042. Transportability and resistance to vibration, inclined planes and tipping over.

The static UPS to which this specification relates must carry the CE mark, in accordance with European directives on safety and radio interference (2006/95/CE Low Voltage Directive and 2004/108/CE EMC).

3 - Abbreviations

To facilitate quick readability of this document, the following conventional abbreviations are adopted (in alphabetical order):

N Generic symbol for connection to neutral system;

CEM / EMC Electromagnetic compatibility;

IEC International Electrotechnical Commission (IEC/CEI);

PF Power Factor.

4 - General description of the static uninterruptible power system

Each single UPS shall comprise the following sub-assemblies:

  • rectifier;

  • battery charger;

  • battery bank;

  • inverter;

  • automatic bypass,

  • maintenance bypass.

4.1 – General characteristics

Reference ambient conditions

  • Working temperature range: 0°, up to +40C

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

The uninterruptible power supply must meet the following essential technical specifications:

Number of parallel UPS units per system

At least 6

Type of power supply (input/output)

3ph + N / 1ph + N


single / parallel

Rated apparent power at 40°C


Rated active unitary power (Pn) at 35°C


Active power density at 35°C with bearing plane of no more than 0.35m2


Input voltage range


Input voltage tolerance

+/-20% and up to -40% at partial load

Input frequency and tolerance

50 Hz / 60 Hz ± 10%

Output voltage and tolerance

380-400-415V +/-1% sinusoidal

Output frequency and tolerance

50 Hz / 60 Hz +/-0.1%

Sound pressure measured at a distance of 1 m with rated load (ISO 7779)

 50 dBA

classification (CEI EN 62040-3)

VFI - SS - 111

Total efficiency AC/AC at 100% load

≥ 98 %

Total AC/AC efficiency in double conversion mode (ONLINE), verified and certified by an independent, accredited body.

≥ 95.3%

Colour of metal enclosure

Polyester epoxy powder coating

RAL7012 grey wrinkle finish

4.2 – 3-level IGBT rectifier

The UPS unit's rectifier must be made with IGBT technology throughout with DSP (Digital Signal Processor) control.

Technology and topology of the bridge rectifier

IGBT 3 level

Rated voltage

400V 3ph + N

Voltage tolerance

+/-20% up to -40% at partial loads without using the batteries

Rated frequency

45 - 65 Hz

Input power factor

≥ 0.99

Total harmonic distortion (THDi)

 2.5 % without active or passive filters

Active and passive filters may not be used to prevent resonance and slow protection equipment response.

4.3 – IGBT battery charger

The system must include one or more battery chargers:

  • with IGBT technology;

  • separate from the rectifier;

  • with charging voltage independent from the DC bus voltage;

  • dedicated and independent for each accumulator bank;

  • maximum recharge current at least 13 Amp;

The battery charger must be able to operate with the following types of accumulator:

  • Lead acid, hermetically sealed

  • Lead acid, vented

  • NiCad

Depending on the temperature, the battery charger shall be able to select the most suitable recharge method automatically, without operator intervention, alternating float mode in combination with “intermittent” charge in such a way as to limit the effects of corrosion (plate sulphation) and significantly prolong battery life.

The maintenance charge voltage must be automatically regulated in relation to the temperature of the battery compartment.

The battery compartment must be equipped with a temperature sensor for this purpose.

The following parameters must be adjustable and configurable:

  • maximum recharge current limit;

  • constant float mode current and voltage;

  • switching threshold from fast recharge mode to maintenance mode.

The battery charge regulation and control circuit shall also provide the following functions:

  • continuous monitoring of the battery circuit (battery interrupted) with visual alerts on the local user interface;

  • monitoring of battery efficiency, via partial discharge at settable intervals; the check consists in continuously monitoring the discharge current and comparing it with the ideal discharge curve;

  • continuous monitoring of the battery charger's output voltage to ensure it remains within the limits required to optimise battery life. Recharging voltage anomaly alerts followed by deactivation of the charger;

  • residual battery capacity display.

4.4 – Batteries

The stationary accumulator bank will comprise lead acid valve regulated sealed batteries / lead acid vented batteries / NiCad batteries complete with metal enclosure as follows:

  • It must comply with all European standards and directive required for CE marking;

  • It must be made with a metal structure able to support weight and mechanical stress during transport;

  • It must be rated at least IP20 (if it has a door, it must be rated IP20 even with the door open);

  • The UPS must be connected to the battery enclosure via their front panels for ease of installation, inspection and maintenance;

  • The battery enclosure must be equipped with suitable circuit breakers and protection equipment which are also appropriate for the UPS to which it is connected;

  • The enclosure must have a RAL7012 wrinkle finish grey coating on all externally visible parts;

  • To simplify maintenance of the accumulator banks and access (visible and otherwise) to the circuit breakers, protection equipment and connectors, the enclosure must be completely accessible via a door in its front panel;

The accumulator bank must have an expected service life of years with a capacity of minutes at ... % load.

The runtime in terms of the unitary power output factor must also be clearly stated.

4.5 – 3-level IGBT inverter

The inverter will be equipped with an IGBT switching circuit (PWM type) to convert the rectifier or battery DC voltage into AC, and an output filter rated to create the output voltage envelope. The inverter will be digitally controlled via DSP.

The inverter must be able to deliver the rated power at the rated voltage and frequency and the following output specifications:

Inverter technology and topology

IGBT 3 level

Load management at rated power

Any load, from 0.1 inductive to 0.9 capacitive

Rated active power specified on UPS ratings plate, in accordance with EN 62040-3


Permanent maximized active power at 35°C in accordance with EN 62040-3


Stable voltage in static operation with input in the admitted range and load variation from 0 to 100%

 1% Vn

Stable voltage in dynamic operation with input in the admitted range and load variation from 0 to 100% and vice versa

Compliant with IEC/EN 62040-3, Class 1 (VFI-SS-111)

Distortion of voltage waveform at linear rated load


Distortion of voltage waveform with non-linear rated voltage as per IEC/EN 62040-3


Phase-neutral short circuit capacity during blackouts for 40ms


Overload capacity for 10 minutes

at least 16.875 kW

Overload capacity for 60 seconds

at least 20.25 kW

The inverter is equipped with its own output current-limiting logic, so that components are not damaged in the event of a short-circuit.

In the case of UPS units configured in parallel, the inverter is protected by a combination of electronic circuitry and fuses.

The system will indicate the following situations affecting the inverter:

  • general maximum temperature warning, with subsequent shutdown of the machine;

  • uncoupling of frequency generator from auxiliary power source;

  • tripping of power circuit fuses.

The inverter must be connected to the load (in both single and parallel configurations) via a contactor to permit galvanic separation of the circuits.

In battery mode, a stability of  1% of the output voltage value must be maintained to the minimum battery voltage.

The inverter must be able to automatically open the battery circuit to prevent damage in case of slow discharge.

4.6 – Automatic bypass

A static bypass must be installed in parallel with each inverter (for both single and parallel installations) to provide:

  • automatic load transfer without interruption to the standby power supply in case of :

    • overload;

    • out of tolerance inverter input DC voltage;

    • over-temperature;

    • inverter fault;

  • automatic transfer from standby circuit to inverter when normal conditions are restored, and verification of the inverter parameters.

Phase-neutral short circuit capacity with power available for 20ms


Transfer time with inverter synchronous with bypass

No interruption

Maximum overload:

  • permanent

  • for 20 minutes

  • for 10 minutes

  • for 2 minutes





The UPS must continuously monitor the standby power supply parameters (voltage, current and frequency).

4.7 – Maintenance bypass

The manual bypass switch will be provided internally and must ensure that equipment downstream of the UPS is supplied directly by the UPS upstream power source when rectifier, inverter and static switches are open. Switching to the manual bypass and back will be possible without load supply interruption (Make Before Break).

5 - Conformity to standards

The system must conform to the following standards:

  • Safety: EN62040-1.

  • EMC emissions: EN62040-2.

  • EMC immunity: EN62040-2 class C2 and C3.

6 – Construction specifications

All items of equipment must be assembled in one or more modular cabinets, manufactured to the following specifications:

  • Enclosure in steel sheet assembled (without welding) with tri-lobe thread forming screws for improved reliability and vibration resistance.

  • Colour RAL 7012 grey with wrinkle finish, polyester epoxy powder coating fro its excellent mechanical characteristics, resistance to chemical agents and aging;

  • The enclosure must be able to bear the loads to which it is subject during shipping, as well as vibration, impact and dropping (per ASTM D999 and D800, AFNOR NF H 00-042);

7 – User interface, controls and alerts

User interface

The user interface on the UPS must be composed of a colour graphic display as follows:

  • Minimum size 3.5";

  • High visibility screen;

  • Reinforced protection against accidental impact.

The interface must provide the following controls/alerts:

  • synoptic electrical diagram of the UPS;

  • selectable languages: at least 30, including English, French, Italian, Spanish,German, Swedish, Polish, Russian and Chinese, with localised installation and user manual.

  • There must be a USB port for updating the languages and downloading the event/alerts log.

  • Display of the following parameters:

  • input and output voltages;

  • input and output currents;

  • input, output and auxiliary frequency;

  • battery voltage;

  • total and remaining battery capacity;

  • battery charge / discharge current;

  • apparent and active power;

  • output load

  • Statistical and graphical measurement of:

  • capacities less than 2 minutes, from 2 to 5 minutes, and greater than 5 minutes;

  • output load;

  • overload less than / greater than 5 seconds;

  • loss of redundancy;

  • internal and battery temperature;

  • time of operation as genset.

Alerts via terminal block contacts

The system will also enable remote indication of the following status or alarm information via the terminal block contacts:

  • general alert;

  • normal mains operation;

  • battery operation;

  • bypass mode;

  • battery draining;

  • low battery charge;

  • over-heating;

  • overload / loss of redundancy.

The following input commands must be remotely controllable via the terminal block:

  • external emergency shutdown with the following functions:

    • shut down the UPS;

    • open the static bypass;

    • disconnect the logic and batteries;

  • handle external alerts;

  • power from GenSet..

Remote Communications

The UPS will be able to communicate with the central control system via:

  • a programmable data I/O card with at least 7 voltage-free contacts for input data (at least 3 contacts) and output data (at least 4 contacts);

  • at least 3 serial comms ports, including one RS232, one RS485 and one Ethernet;

  • the following communication protocols must be supported:

    • SNMP;

    • MODBUS over TCP/IP;

    • HTTP;

    • SMTP;


  • The system must be able to send SMS's over a GSM modem, to report particularly important alerts and events.

The configuration must be settable via the HTML interface.

Remote serial alerts and commands

The interface must be able to display at least the following status or event information:

  • general alert;

  • battery mode with mains supply / no mains supply;

  • normal operation (inverter in-line);

  • static bypass operation;

  • residual capacity in battery mode;

  • battery low charge warning;

  • battery on fast charge;

  • abnormal battery recharge voltage;

  • minimum battery voltage;

  • battery fault;

  • battery charge circuit broken;

  • battery charger system fault;

  • overload alert;

  • ventilation fault alert;

  • out of range temperature/humidity alert;

  • standby power supply out of tolerance;

A predictive/statistical algorithm and interpretation of logged data (number, duration and type of events) regarding:

  • out of tolerance Input voltages;

  • overloads;

  • battery mode operation;

  • switching to standby power supply;

  • over-temperatures.

The UPS must predict potential criticalities for the UPS itself, due to ambient conditions, in advance and alert the maintenance service / monitoring system.

Other requirements:

  • silenceable acoustic alarm;

  • second remote sensor to monitor the enclosure/battery room/other room temperature and humidity;

  • lamp test circuit to verify the system's operation.


The system will be equipped with a microprocessor able to run full machine diagnostics to determine:

  • self-compensation of components to ensure stable settings over time;

  • acquisition of the main diagnostic and monitoring information by computer (local or remote);

  • first installation procedure wizard;

  • full test procedure at full load on UPS, with no further external loads (auto-charge mode)

    • rectifier;

    • inverter;

    • bypass;

    • power bus;

    • cables, contactors and fuses;

The Manufacturer must also supply 24h remote monitoring and maintenance.

8 - Installation

Following supply and installation of the equipment, commissioning shall be carried out by technicians in the employ of the UPS manufacturer or authorised by him.

The following must be completed at this stage:

  • system connections check (positioning and accessibility of UPS, mechanical inspection, ambient conditions, connections and protection equipment, configurations);

  • check availability of all necessary documentation;

  • service trials;

  • validation of measurements made during factory testing;

  • test on load (if available);

  • installation and verification of remote data transmission to control station.

The technician must submit a full report and installation certificate on completion of commissioning.

9 – Tests and service trials

The Client reserves the right to run service trials in the manufacturing plant of the UPS to be supplied, in accordance with the lists listed in CEI EN 62040-3.

The Client must be informed of the date of the trials at least thirty days in advance.

The tests, run by the company at their own expense, with a representative of the client in attendance, includes the following steps:

  • documentation check

  • design, fabrication and installation check

  • interconnections

  • instrumentation check

  • options description

  • description of synoptic panel

  • rectifier static performance

  • battery and charger performance

  • inverter static regulation

  • inverter overload (with resistive load)

  • inverter dynamic regulation

  • bypass transfer test

All tests must be conducted with appropriate instrumentation with valid calibration certificates.

Following a positive outcome of the testing procedure, the manufacturer will issue the relative certificate listing the tests conducted and the results obtained.

Ref.nnnn - Rev.nn - Month 'yy Page/

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