Block diagram and main elements. ABB TLE Scalable UL Series UPS

12/86 TLE Scalable Series 40 to 150 UL S1 UPS User Manual / REV-B

4.1

Block diagram and main elements

Fig. 4.1-1 TLE Scalable Series 40 to 150 - Block Diagram

The TLE Scalable Series 40 to 150 system can be divided into the following main elements:

Control System

TLE Scalable Series 40 to 150 is designed with microprocessor-controlled signal processing circuits.

The interface between the operator and the Unit is provided by the monitoring system on the front panel.

This monitoring system consists of an active mimic diagram, a keyboard and a backlit display.

Rectifier

The Active IGBT Rectifier converts the 3-phase Utility voltage into a controlled and regulated DC-voltage, supplying the Inverter and to charge the Battery through the Battery-charger.

Thanks to modulation strategy applied to IGBT Bridge, the rectifier provides clean input power in terms of low

THDi and Unity Power Factor.

Inverter

The Inverter converts the DC voltage into a three-phase AC-voltage with constant amplitude and frequency, which is completely independent and isolated from the AC-input voltage.

Automatic Bypass

The Automatic Bypass consists of a static semiconductor-switch (SSM: Static Switch Module), used to provide an uninterrupted transfer of the Load from Inverter to Utility.

Back-feed Protection

All TLE Scalable Series 40 to 150 UPS's are equipped with an automatic system for the protection against voltage back feeding towards Utility, through the Bypass (UL 1778 and CSA C22.2 no. 107.3).

This protection works automatically by opening contactor K6 (in series with the thyristors of the static switch) and eventually K7, and acts in case of internal defects of the system.

Battery

The Battery supplies the DC power to the Inverter when the Utility is out of acceptable tolerances.