23
5. MODES OF OPERATION
U
ninterruptible
P
ower
S
upplies (UPS) have an important function in the protection of the critical
and sensitive loads from the irregular mains electricity conditions and they are used to supply
uninterruptible energy to these loads. In such irregular mains electricity conditions, the user can
provide an artificial energy supply to the equipment present in the office or at home by using an
UPS.
UPS during Inverter operation provides stable pure sine wave. This pure sine wave is not affected
from the input voltage fluctuations. This helps to extend the life time of your sensible loads. Power
factor of the current consumed from the mains is nearly one. You do not have any problem on
generator or isolation transformer applications. The reactive energy consumption decreases.
During the mains failure, the energy needed for the load is provided by the battery in UPS (or in
external battery cabinet/s). These batteries are charged by an intelligent battery charging circuit
during the mains within the limits. Batteries are lead acid battery (VRLA) and do not require any
maintenance until the end of their life time.
In case of longer overload or inverter failure situation, UPS transfers the load to Bypass line, and
load is supplied from the mains. When the condition turns back to normal, UPS shall continue to
supply the load through inverter.
UPS control and management is done by Digital Signal Processor (DSP) which is 200 times faster
than standard microprocessors. This helps to make your UPS smarter. DSP uses all the sources on
optimum conditions, observes the failure conditions, and communicates with your computer
system.
UPS can be operated in one of the following operational modes depending on the condition of
mains, battery, bypass, UPS and/or user preference.
You may see the block diagram of UPS in
Appendix-2 Description of UPS and Block Diagram
.
There are three operation modes, which differ in the path of the energy flow.
UPS block diagrams and the energy flow path in each operation mode is shown below:
Summary of Contents for PDSP 33010
Page 17: ...12 80kVA Terminal Connections Separate Bypass Terminal Bypass L1 L2 L3 N version is optional...
Page 18: ...13 100kVA Terminal Connections Separate Bypass Terminal Bypass L1 L2 L3 N version is optional...
Page 19: ...14 120kVA Terminal Connections Separate Bypass Terminal Bypass L1 L2 L3 N version is optional...
