23
MANUAL BYPASS
AC OUTPUT
BYPASS
STATIC
SWITCH
INVERTER
BATTERY
CHARGER
BATTERY PACK
DC-LINK
RECTIFIER-BOOSTER
BYPASS
LINE
AC INPUT
Fig. 15.
UPS power flow in battery mode.
4.5.3. Bypass mode
In this operating mode, the voltage supplied to the loads cor-
responds directly to the emergency (or bypass) line, connected
to the output by controlled thyristors. The inverter is discon-
nected from the output (open relays), and this converter can
be completely stopped. The rectifier-booster and the charger
continue to operate, so the batteries will continue to maintain
their optimum level of charge.
This is an operating mode where the loads are not "protected"
against disturbances in the AC network or even power outages.
From normal operating mode, the output load can be trans-
ferred to the bypass line, both via manual command by the
operator or via communications, as well as automatically via
the UPS (its management logic), given specific circumstances
(alarms), such as:
•
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. 16.
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.
SLC CUBE4
- UNINTERRUPTIBLE POWER SUPPLY SYSTEM
-
USER MANUAL
Summary of Contents for SLC CUBE4
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