inform ETR EVO Series, Installation And Operating Manual

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ETR EVO UPS User Manual (Ver. 1.0) Page 28
5. MODES OF OPERATION
Uninterruptible Power Supplies (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.
ETR EVO 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-4 Description of UPS and Block Diagram .