inform ETR EVO Series, Installation And Operating Manual

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ETR EVO UPS User Manual (Ver. 1.0) Page 29
5.1. Bypass Operation (Eco-Mode)
In this mode, as long as the mains voltage and frequency within the limits, the load is supplied by the
mains in a controlled manner (the inverter is in standby state). The purpose of using this mode is to
increase the efficiency up to 98,5% and to provide energy saving; since the loads are supplied by the
mains directly, the loads are unprotected against any possible future risks. (e.g. surge voltage, etc.).
Devices without separate bypass mains input, absorb energy from the mains. In devices with separate
bypass mains input, energy is drawn from the separate bypass mains.
Bypass Mode Operation can be chosen through the Commands Menu.
If this mode is not chosen by the user, UPS transfers the load automatically to the mains in order to
protect them during abnormal conditions (the inverter is disabled).
While UPS operates
in Online Operation, UPS switches to bypass automatically (in case the mains
voltage and frequency is within the limits of bypass) in the following conditions;

During the start-up

Bypass Priority

Inverter Fault

Prolonged Overload

High Heatsink Temperature
After these conditions are eliminated, the UPS automatically returns to inverter.
UPS switches to another mode in case the mains voltage or frequency go beyond the Bypass limits.
UPS returns to Bypass Operation when the mains returns to the limits.
Bypass Operation Voltage Range
The mains voltage is required to be in certain range for Bypass Operation. Voltage tolerance is set

10% of the output voltage in the factory. For instance; if the output voltage is 220V, the tolerance
range of bypass voltage would be 198V – 242V. In case the input voltage decreases below 198V or
increases above 242V; if UPS runs in Bypass Operation UPS, then switches to Online Operation; if UPS
Bypass Operation mode does not provide perfect stability in
frequency/waveform/rms value
of the output voltage like in Online Operation. Thus, the use of this mode should be
carefully
executed according to the level of protection required by the application.
Bypass Operation mode does not provide electronic short circuit protection as
provides in
Online Operation. If a short circuit occurs on the output during this operation, the
thermal/magnetic protection will act and all loads will be deenergized.
Prolonged overloads in Bypass Operation may cause the thermal/magnetic
protection act. In
this case, all loads will be deenergized.