24
SALICRU
•
Output overload.
•
Overtemperature of UPS parts or elements.
•
Failure or malfunctioning of an internal converter.
•
Manual bypass activation.
MANUAL BYPASS
AC OUTPUT
BYPASS
STATIC
SWITCH
INVERTER
BATTERY
CHARGER
DC-LINK
BATTERY PACK
RECTIFIER-BOOSTER
BYPASS
LINE
AC INPUT
Fig. 17.
UPS power flow in bypass mode.
4.5.4. Maintenance bypass mode
This operating mode allows the UPS to be maintained or re-
paired without interrupting the power supply to the loads.
The operations for transferring to manual bypass and
returning to normal operation will be carried out in ac-
cordance 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 actions.
After the controlled transfer process to the maintenance by-
pass, the loads will be supplied directly from the bypass line
(common or not to the rectifier AC input), and initially all con-
verters and internal power supplies of the UPS will be stopped.
In this way, the qualified technical service staff will be able to:
•
Check the inside of the UPS without the presence of dan-
gerous voltages (except for battery voltage).
•
Replace boards or electronic components that require
maintenance or repair.
•
Start parts of the UPS in test mode.
MANUAL BYPASS
AC OUTPUT
BYPASS
STATIC
SWITCH
INVERTER
BATTERY
CHARGER
DC-LINK
BATTERY PACK
RECTIFIER-BOOSTER
BYPASS
LINE
AC INPUT
Fig. 18.
UPS power flow in maintenance bypass mode.
4.5.5. ECO mode.
In addition to normal mode and bypass mode, it is possible to
activate ECO mode, in order to obtain greater overall system
efficiency than normal mode. The downside is that the degree
of protection for critical loads will be lower than normal mode
(although greater than bypass mode).
In this operating mode, the output voltage is supplied by the
static bypass via the emergency (or bypass) line, and the in-
verter converter will be stopped, ready to restart and connect to
the output when a bypass voltage outside of the programmed
ranges is detected.
