Delta NT Series User Manual

12
Chapter 3 Operation Modes
Figure 3-8-b: Parallel Status Block of Reserve AC Power Supply Mode (260-500kVA)
MANUAL BYPASS
RESERVE INPUT
OUTPUT
STATIC SWITCH
RECTIFIER INPUT
LOAD
BATTERY BANK
SWITCH
SWITCH
SWITCH
RESERVE
MAINS SWITCH RECTIFIER INVERTER
Power Flow
Power Flow
Power Flow
MANUAL BYPASS
RESERVE INPUT
RECTIFIER INPUT
BATTERY BANK
SWITCH
SWITCH
RESERVE
MAINS SWITCH RECTIFIER INVERTER
Power Flow
Power Flow
UPS1
UPS2
Power Flow
OUTPUT
STATIC SWITCH
SWITCH
Power Flow
Power Flow
Power Flow
When the inverter is in abnormal situations such as over temperature, long-time
overload, output short circuit, abnormal output voltage and exhausted battery, the
inverter will shut down itself for self-protection. If the reserve AC power is normal,
the static switch of each parallel UPS will switch to the reserve AC power to supply
power to the loads without any interruption of power supply. After the abnormal
situations mentioned above are eliminated, the static switch will switch back to the
main AC source (see Figure 3-8-a and 3-8-b).

Delta NT Series Specifications

General

Brand	Delta
Model	NT Series
Category	UPS
Language	English