System Operation; Normal; Loss Of Main Power; Return Of Main Power - Toshiba T90S3S08KS6XSN Manual

Guide Specification – 3-Phase Static Uninterruptible Power Supply

2.3 System Operation:

The UPS shall operate as a fully automatic on-line system in the following modes:

2.3.1 Normal

IGBT Rectifier converts AC input power to DC power for the inverter and for charging the
batteries. The IGBT inverter supplies clean and stable AC power continuously to the critical
load. The UPS Inverter output shall be synchronized with the bypass AC source when the
bypass source is within the AC input voltage and frequency specifications.

2.3.2 Loss of Main Power

When Main Power is lost, the batteries shall automatically back up the inverter so there is no
interruption of AC power to the critical load.

2.3.3 Return of Main Power

The system shall recover to the operating mode in Item 1 and shall cause no disturbance to
the critical load while simultaneously recharging the backup battery.

2.3.4 Transfer to Bypass AC source

If the UPS becomes overloaded the UPS controls shall automatically transfer the critical load
from the inverter output to the bypass AC source without interruption. When the overload
condition is removed, after a preset "hold" period the UPS will automatically re-transfer the
critical load from the bypass to the inverter output without interruption of power to the
critical load.

2.3.5 Maintenance Bypass

An optional manual make-before-break maintenance bypass panel may be provided to
electrically isolate the UPS for maintenance or test without affecting load operation.
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GENERAL CONDITIONS FOR INSTALLATION

3.1 Required Output Capacity:

The UPS will be available in the following output capacities: 80, 100, 160, and 225 kVA (72, 90,
144, and 202.5 kW). Each unit shall be capable of being operated either independently or
connected in parallel for a total of up to four like-capacity units.

3.2 UPS Environment:

3.2.1 Standard Environmental Parameters

Operating Temperature
Operating Humidity
Altitude

3.2.2 Discharge Heat from UPS at full load.

80 kVA
100 kVA
160 kVA
225 kVA
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: 32° to 104°F (0° to 40°C)
: 5 - 95% (Non-condensing)
: 7400 ft. (2250 m) (without derating)
: 11,300 Btu/Hr
: 14,100 Btu/Hr
: 19,400 Btu/Hr
: 27,300 Btu/Hr
March 2009