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Chapter 1 Introduction
4
Front view
1:Fan 2:rectifier 3: softstart relays 4:contactor
5: two auxiliary power supply boards ULW2L61M5
6: D level lightning protection device SPD12Z 7: Hall current sensor
8:battery input terminals 9:circuit breaker Q3BP for maintenance
10:rectifier input circuit breaker Q1 11:bypass input circuit breaker Q2
12:Inverter 13: fast fuse
14: parallel board ULW2L61M3 15: EMI board ULW2L61M4
16: magnetic core 17: output circuit breaker
18:operation keypad board 19: LCD
20: monitoring board ULW2L61U2 21: Battery EMI board
22: Fuse NT100 23: 4 leveling feet (M20)
Figure 1-4 Components of 40/60kVA UPS
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.