UPS

Question 1

What is the purpose of the inverter?

Answer 1

To change DC to AC

Question 2

What is the difference between a maintenance bypass and a static bypass?

Answer 2

Maintenance bypass is always manually initiated and is used to clear the UPS for maintenance or repair. Static bypass is used to seamlessly transfer loads off of the inverter.

Question 3

Why is an exhaust fan needed in the battery room?

Answer 3

To remove hydrogen gas

Question 4

What two conditions would not allow the UPS to go to bypass.

Answer 4

Voltage out of sync. / phase out of sync.

Question 5

True or False:

Suddenly adding a large load to a UPS may cause it to go to bypass.

Answer 5

TRUE

Question 6

What does the static bypass on a UPS do?

Answer 6

Static bypass is used to seamlessly transfer loads off of the inverter.

Question 7

Why does the UPS convert power from AC to DC?

Answer 7

To reap the benefits of battery backup.

Question 8

What is the purpose of the rectifier?

Answer 8

To change AC power to DC power

Question 9

Under maximum data center load, what happens to an N+1 redundant UPS system if one of the modules fails?

Answer 9

Nothing. One module is redundant.

Question 10

What is an IGBT?

Answer 10

Insulated-Gate Bipolar Transistor

Question 11

Can you name more than one UPS topology?

Answer 11

On line or dual conversion, Line interactive, standby, Delta Conversion, Rotory.