Salicru SLC CUBE 4 7.5 kVA Mode D'emploi page 90

4.5.3. Bypass mode.
In this operating mode, the voltage supplied to the loads corre-
sponds directly to the emergency (or bypass) line, connected to
the output by controlled thyristors. The inverter is disconnected
from the output (open relays), and this converter can be completely
stopped. This is a transient operating mode, or one that has been
reached due to an emergency, where the loads are not "protected"
against disturbances in the AC network or even power outages.
Fig. 14. UPS power flow in bypass mode.
4.5.4. Maintenance bypass mode
This operating mode allows the UPS to be maintained or repaired
without interrupting the power supply to the loads.
The operations for transferring to manual bypass and re-
turning to normal operation will be carried out in accord-
ance with the steps set out in the corresponding chapter of this
document. The user will be solely responsible for any damage
caused to the UPS, loads and/or installation due to improper ac-
tions.
Fig. 15. UPS power flow in manual or maintenance bypass mode.
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From normal operating mode, the load can be transferred to the
bypass line, both via manual command by the operator or via com-
munications, as well as automatically via the UPS (through its man-
agement logic), given specific circumstances (alarms), such as:
Output overload.
•
Overtemperature of UPS parts or elements.
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Failure or malfunctioning of an internal converter.
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Manual bypass activation.
•
After the controlled transfer process to the maintenance bypass,
the loads will be supplied directly from the bypass line (common or
not to the rectifier AC input), and initially all converters and internal
power supplies of the UPS will be stopped. In this way, the quali-
fied technical service staff will be able to:
Check the inside of the UPS without the presence of dangerous
•
voltages (except for battery voltage).
Replace boards or electronic components that require mainte-
•
nance or repair.
Start parts of the UPS in test mode.
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