What are the three components in a basic ups system?
Rectifier
Dc storage battery
Inverter
What does an inverter do?
Changes dc power source to single or three phase ac voltage
Systems commonly range from __ to __ minutes of back up
5 to 30
Ups systems can encounter failures from several factors
Overloading the system
High temperature
Components of the rectifier or inverter can fail affecting the ups
When the ups system encounters a failure, the system initiats a shut down. The by pass switch will be closed. What is the purpose of the bypass switch
It ensures there is no power interruption to the critical loads
What kind of switch is the preferred choice for a by pass switch?
Static switch/ solid state switch. Can operate in microseconds
What is the most common type of inverter
PWM
pulse width modulation
In a basic PWM there are four solid state switches. What are they?
SCR
BJT
IGBT
Installation of a ups can be devided into four areas which are?
Inputs
Outputs
Dc
Auxillaries
The battery cells used in a ups are?
Lead acid type
Lithium-ion
Does a ups system shut down before the battery is totally discharged?
Yes
