Delta NT Series User Manual

10
Chapter 3 Operation Modes
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units fails and its loads are less than the sum of rated-load values of other units in
parallel, the rest of units can share the sum of loads; otherwise, all UPS units will
shut down inverters and switch to the reserve AC power to supply power to the
loads (see Figure 3-6-a and 3-6-b).
3.7 Back-up Mode (Parallel)
Figure 3-7-a: Parallel Status Block of Back-up Mode (10-200kVA)
RECTIFIER INPUT
RESERVE
MAINS
BREAKER
RESERVE INPUT
BREAKER
MANUAL BYPASS
BREAKER
OUTPUT
BREAKER
Power Flow
BATTERY BANK
Power Flow
STATIC SWITCHINVERTERRECTIFIER
RECTIFIER INPUT
RESERVE
MAINS
BREAKER
RESERVE INPUT
BREAKER
MANUAL BYPASS
BREAKER
OUTPUT
BREAKER
BATTERY BANK
Power Flow
STATIC SWITCHINVERTERRECTIFIER
Power Flow
LOAD
UPS 1
UPS 2
Power Flow
Power Flow
Power Flow
When the utility AC power fails or other unstable voltage occurs, the batteries will
instantly provide the inverter with DC power to keep continuous operation. Hence,
the UPS output will not be interrupted (see Figure 3-7-a and 3-7-b).

Delta NT Series Specifications

General

Brand	Delta
Model	NT Series
Category	UPS
Language	English