Eco Mode; No Operation; Operation With Maintenance Bypass; Operation With External Maintenance Bypass (Optional) - LEGRAND Keor T Series Operating Manual

4.4.

Eco Mode

Eco Mode Operation can be chosen through the Commands Menu.
The purpose of using this mode is to increase the efficiency up to 98% and to provide energy saving; since
the loads are supplied by the mains voltage directly, the loads are unprotected against any possible future
risks. (e.g. surge voltage, etc.). In devices with auxiliary mains supply; energy is drawn from the auxiliary
mains supply.
As long as the mains voltage and frequency within the limits, the load is supplied by the auxiliary voltage
in a controlled manner; double conversion chain is on standby while ensuring the recharge of the batteries.
UPS switches to another mode in case the mains voltage or frequency goes beyond the Bypass limits.
UPS returns to Eco Mode Operation when the auxiliary voltage returns to the limits.
4.5.

No Operation

This mode is used to make settings through Front Panel or by Service Software. To start-up UPS in No
Operation mode; all the circuit breakers must be at
Bypass circuit breaker. In this mode UPS does not apply output voltage to supply the loads. After all settings
done during No Operation Mode, UPS should be restarted for the new service settings to be saved and
valid. It is not necessary to restart UPS for user settings to be valid.
4.6.

Operation with Maintenance Bypass

Maintenance Bypass enables the user to isolate the electronic circuitry of the UPS from the mains voltage
and the load without interrupting the load operation by connecting the loads directly to the bypass utility
supply. This feature is useful while waiting service staff and should only be executed by trained Personnel.
4.7.

Operation with External Maintenance Bypass (Optional)

The external manual maintenance bypass may be installed in the general distribution panel where Keor T
is installed, or in an external bypass panel that is supplied on request.
This operating mode enables the user to isolate the electronic circuitry of the UPS from the mains voltage
and the load without interrupting the load operation by connecting the loads directly to the bypass utility
supply. This feature is useful while performing maintenance or service and should only be executed by
trained Personnel.
10
Eco Mode Operation does not provide perfect stability in frequency/waveform/rms value
of the output voltage as in Online Operation. Thus, the use of this mode should be carefully
executed according to the level of protection required by the application.
Eco Mode Operation does not provide electronic short circuit current limitation. If a
short circuit occurs downstream distribution panel supplied by the UPS, the magnetic
protection off the Bypass line MCCB may act if not selective with downstream protection
and all loads will be de energized. Check discrimination applies between upstream and
downstream switchboard.
This procedure may only be executed by trained Personnel.
During Maintenance Bypass operation; in case of any mains voltage interruption occurs,
all loads on the output will be deenergized. Maintenance Bypass Operation should not be
preferred for long time use.
Q1
"0" position except Input circuit breaker and
Q4