Liebert 130 kVA - Manual (Page 101)

User Manual
Hipulse - Single Phase ‘1+N’ UPS System 130 kVA - 110V
81
10.2 INPUT TRANSFORMER CUBICLE
10.2.1 Introduction
The Input Transformer Cubicle is placed in the Input supply path of the UPS . It
consist of Star - Star OR Delta - Star transformer of rated capacity to provide
Isolation from the Input Distribution supply to the UPS input.. The Cubicle also
consist of Battery Breaker with its Battery Trip PCB of the respective UPS.
10.2.2 Termination
The Incoming Supply from the Customers distribution is fed as input to the Input
Transformer Cubicle. The incoming supply 3ph,4wire is fed to RI ,SI,TI,NI terminals .
The Battery Breaker input from the UPS is fed to +R1 , -R1. The output of the
Transformer cubicle is available on the RU,SU,TU,NU terminals , the Battery Breaker
output is fed to BATTERIES through terminals +B ,-B terminals
10.2.3 Indication & Metering
LED’s are used to monitor availability of Input voltage before the Isolation Transformer
and after the Transformer which are seen on the Mimic Panel.
Incoming L-L voltage and Phase current is measured using Voltmeter & Current meter
which are seen on the Mimic Panel , A selector switch S1 is used to select RY ,YB, BR
Voltage and R,Y,B Phase currents
10.2.4 Protection
Incoming 3 pole MCCB is used as Protective Device before the Isolation
transformer, Control fuses are used for protection of Voltmeter and Fans Cubicle
Battery path MCCB is used as Protective Device in Battery path
Utility socket is provide for single phase supply