Legrand TRIMOD HE 15 kVA [6/14] Description of the system
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Legrand TRIMOD HE 15 kVA [6/14] Description of the system

6 di 14
3 DESCRIPTION OF THE SYSTEM
3.1 POWER MODULE
Each Power Module will be composed by following functional blocs:
! Inverter
! Booster
! Battery Charger
! Rectifier/PFC
! Automatic Bypass
3.1.1 Rectifier/PFC
The rectifier must include a control and regulating circuit (PFC), which in addition to normal rectifying
functions will allow the:
! Automatic correction of the power factor to the at value >0,99 (since from the 50% of the
nominal load);
! Reduce the Harmonic distortion of the input current obtaining THDI
in
= 3% with nominal load
3.1.2 Inverter
The inverter must be based on a switching IGBT circuit with High Frequency PWM, and must be able to
transform the DC supply, coming from rectifier/PFC or buster, in case of battery run, in AC voltage.
Furthermore must be present also control circuits which guarantee:
! Arrest and protection of the inverter in case of strong and long overloads;
! Keep the harmonic distortion of the output voltage les than 1% (THDu
out
< 1%) either in normal
run than in battery run;
! Arrest and protect the inverter in case of over temperature of power converters elements;
! Manage the speed of the Fans accordingly with internal temperature and applied load;
3.1.3 Booster
The “booster” must transform the battery DC voltage from the nominal value of 240 Vdc, to the dual,
positive and negative buses, with middle point referred to the passing trought neutral. From the positive
bus the inverter will obtain the positive half period of the output voltage sine wave, from the negative
bus the inverter will obtain the negative half period of the output voltage sine wave.
Protection circuits must be present on the booster to protect the booster circuit in case of stron overload.
3.1.4 Battery Charger
The Battery Charger must be equipped with control and regulation circuit both for charging voltage and
current to batteries, in order to have a controller battery charge and optimize the battery life.
The UPS must charge batteries with and early boost charge followed by a constant charge and, at the
end, with a floating charge. During normal run the UPS will execute periodically a battery equalizeing in
order to recover natural charge leakages and keep al batteries at the same capacity. This battery
charging cycle will increase the batteries life time, with relevant reduction of the maintenance costs.
The battery recharge must be available also when UPS is turned off.
3.1.5 Automatic Bypass
The Automatic bypass must be composed by following parts:
− Static switch with zero time for intervention, connected in parallel with an electro-mechanic switch
which needs a trannsfer time but with zero heat dissipation amog the time;
− Microprocessor Logic comand and controll which will attend to:
! Automatically transfer the load to the mains, as soon as following anomalous events occur:
overload, overtemperature, voltage runaway on the DC buses, anomalties on the inverter;

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