Toshiba 4200FA Manual De Usuario

 

The following illustration shows power flow during the battery backup mode. In the event of an 
AC power failure the batteries of the UPS instantly begin supplying DC power to the UPS to the 
main inverter circuit. This circuit converts the DC power into AC power. The AC power is 
available at the output of the unit. This back-up process will continue until the UPS battery 
voltage drops below a specific minimum level. At which time the batteries cease supplying 
power to the load. 

This minimum level is the shutdown voltage minimum (V min). The rated battery voltage table 
on page 36 shows (V min). The battery backup time and discharge process is explained in 
Section 6.2. 

 

Static 

Bypass

 

MCCB

 

Power flow in battery backup mode for the 4200FA 80 kVA UPS 

 
 
6.1.4 

An external maintenance bypass may be installed in parallel with the UPS to allow servicing of 
the UPS while maintaining power to the load.  Contact an authorized service representative for 
further information. 

 

 

 
High transient currents may result if the external bypass is engaged 
while the UPS is in normal mode. 

 

Converter

 

Inverter

 

Charger/ 
Chopper

 

Isolating 

XFMR

 

External 

Batteries

 

Output 

Power 

Input 

Power 

Power Flow

 

30  

4200FA 

User’s 

Manual