GE Industrial Solutions TLE Series 225-500 User Manual - Manual (Page 13)

Critical Power
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GE_UPS_USM_TLE_SUL_M22_M50_1US_V010.docx User Manual TLE Series 225 - 500 UL S1
4.1 BLOCK DIAGRAM AND MAIN ELEMENTS
Fig. 4.1-1 Block Diagram TLE Series 225 - 500
The TLE Series 225 - 500 system can be divided into the following main elements:
Control System
TLE Series 225 - 500 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 Series 225 - 500 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, or due to wrong
manipulations on the Manual Bypass Q2.
Manual Bypass
The Manual Bypass consists of a pair of manual switches (Q1 and Q2), which removes the UPS from the
Load for maintenance, while still supplying the Load with power directly from the Utility.
Battery
The Battery supplies the DC power to the Inverter when the Utility is out of acceptable tolerances.