Functional Description | Toshiba G9000 guide

Guide Specification – 3-Phase Static Uninterruptible Power Supply

Harmonic Voltage Distortion	: < 2% THD (100% Linear Load)
	: < 5% THD (100% Non-linear Load)
Phase Displacement	: 1° Maximum at 100% load
Voltage Transients:
100% Load Step Change	: +/-2%	Maximum (Without battery assistance)
Loss or Return of Input	: +/-1%	Maximum
Transfer from Bypass to Inverter : +/-5% Maximum
(At Bypass Rated Voltage)
Recovery Time	: 1 cycle

5FUNCTIONAL DESCRIPTION

The UPS shall protect the load against surges, sags, undervoltage, and voltage fluctuation. The UPS shall have built-in protection against permanent damage to itself and the connected load for all predictable types of malfunctions. The load shall be automatically transferred to the bypass line without interruption in the event of an internal UPS malfunction. The status of protective devices shall be indicated on a LCD graphic display screen on the front of the UPS.

5.1IGBT Rectifier

5.1.1General

A solid-state, multi-level IGBT Rectifier shall convert the incoming AC power into DC power to supply the inverter input and system battery.

5.1.2Voltage Regulation

The rectifier output voltage shall not deviate by more than +/- 1.0% RMS under the following conditions:

0% - 100% loading (balanced and unbalanced loading, non-transient)

+15% - 20% utility voltage change +/-10.0% utility frequency change

5.1.3Reflected Harmonic Content Input current THD shall be

< 3% at 60%-100% load

< 6% at 25%-59% load.

5.2IGBT DC-DC Converter

5.2.1General

A solid-state IGBT Battery Converter/Charger shall control battery charging.

5.2.2Battery Charge Current Limit

The Converter logic shall provide DC for controlled battery charging. The battery current sensing shall be independent of the Converter DC Output current sensing to provide precise battery recharging control. The DC/DC Charging Converter shall include a circuit to regulate the battery charging current to between 100% and 125%.