Toshiba 4200FA

4200FA-XT

6) Altitude: 3300 ft. maximum without derating (up to 5000 ft.- 95%

capacity; up to 7500 ft. - 90% capacity)

4.0 FUNCTIONAL DESCRIPTION

A. Converter / Charger / DC Chopper

DESCRIPTION - The converter/charger shall consist of a solid-state three

phase rectifier, DC to DC converter (chopper), output filter, and transient

suppresser network to regulate and maintain DC power to the inverter.

1) TRANSIENT SUPPRESSER - The incoming AC utility shall first be

connected to a molded case circuit breaker as a means of disconnecting

power to the UPS. Power shall flow through a surge absorber to prevent

large transients from passing through to the load or damaging the

batteries. Power shall then flow through a line filter to prevent sags or

surges from passing to the load.

2) CONVERTER/CHARGER - The converter shall serve to change

incoming AC power to DC, which shall be supplied to the DC chopper.

From this point, DC power is used to recharge the battery bank while

simultaneously providing power to the inverter.

a) Input Frequency Range: 45-65 Hz, continuous, without battery

operation

b) Capacity: Battery recharge shall be to within 90% of nominal

from a fully discharged state in 10 times the discharge time.

3) DC CHOPPER - The chopper circuit shall consist of inductors,

capacitors, diodes and IGBT's (Insulated Gate Bipolar Transistors). The

chopper shall have the function of providing start-up protection (by

checking phase rotation of incoming utility power), boosting the DC to the

inverter (during low AC input voltage conditions), providing power factor

enhancement, and reducing reflected harmonics to incoming utility power.

B. Pulse Width Modulated (PWM) Inverter

DESCRIPTION - The PWM (Pulse Width Modulated) inverter shall

incorporate an advanced IGBT design, an output isolation transformer,

and output overcurrent protection for clean, regulated output power to the

critical load.

1) INVERTER - The inverter network shall consist of a high speed IGBT

switching network designed to supply non-linear loads with a clean and