Operation Modes - Liebert UPS System User Manual

1:Fan
5: two auxiliary power supply boards ULW2L61M5
6: D level lightning protection device SPD12Z
8:battery input terminals
10:rectifier input circuit breaker Q1
12:Inverter
14: parallel board ULW2L61M3
16: magnetic core
18:operation keypad board
20: monitoring board ULW2L61U2
22: Fuse NT100

1.5 Operation Modes

1. Normal mode
When the utility is normal, the UPS powers the load through the rectifier and
inverter and charges the batteries at the same time, as shown in Figure 1-5. This is
called the Normal Mode.
Chapter 1 Introduction
Front view
2:rectifier 3: softstart relays
Figure 1-4 Components of 40/60kVA UPS
4
4:contactor
7: Hall current sensor
9:circuit breaker Q3BP for maintenance
11:bypass input circuit breaker Q2
13: fast fuse
15: EMI board ULW2L61M4
17: output circuit breaker
19: LCD
21: Battery EMI board
23: 4 leveling feet (M20)