GE 30 Benutzerhandbuch

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OPM_SGS_USM_10K_40K_0US_V010.doc 

11/88 Operating 

Manual 

SG Series 10, 20, 30 & 40 kVA 

 

 

The 

SG Series system can be divided into the following main elements: 

 

SG Series  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. 

 

The standard Rectifier consists of a 6-pulse SCR-bridge, which 

converts the 3-phase Utility Voltage into a controlled and regulated DC-voltage. 
This regulated DC-voltage is used to supply power to the Inverter, and to provide charging 
power to the Battery. 

 

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. 

 

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 

SG Series UPS's are equipped with an automatic system for 

the protection against voltage back feeding towards Utility, through the Bypass (Applied 
Standard IEC 62040-1). 
This protection works automatically by opening contactor  K6 and K8 (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. 

 

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. 

 

The  Battery  supplies the DC power to the Inverter when the 

Utility is out of accepted tolerances.