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12
3.7 Input and Output Transformer-to-UPS Connection Line Diagram
Connections are shown below for the cabinet with built-in input isolator transformer, output auto transformer and breakers with
trip and fault LED.
Figure 3-7: Connection Line Diagram
3. Installation
Input Transformer
Red LED (Lit = Over-Temperature, Off = Normal)
Output Transformer
Red LED (Lit = Over-Temperature, Off = Normal)
AC Input
480V AC
Output
480V AC
Output
208V/120V
AC, 3-Phase,
4-Wire +
Ground to the
UPS Input
Transformer Input 208V
AC, 3-Phase, 4-Wire
+ Ground to Input of
Output Transformer
Maintenance Breaker
Bypass Breaker
Mains Breaker
Battery input: +/–120V DC
Output Breaker
PFC
STS
Inverter
Charger
Breaker
3PH
Breaker
3PH
Transformer Cabinet
UPS
Isolation Transformer
Delta in 480V/208V Wye out
Auto Transformer
Wye 208V/Wye 480V
Trip
Trip
UPS Output
208/120V,
3-Phase, 4-Wire
+ Ground to
Input of Output
Transformer
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