04-3275_OPM_ABB_CONCEPTPOWER_DPA_500kW_EN_REV-A.docx Page 50/78 ABB
Modifications reserved
6.6 OPERATING MODES
6.6.1 Mode "ON LINE" (INVERTER MODE)
The ON-LINE-Mode is the UPS-Operating Mode in which the load is supplied through the RECTIFIER and
INVERTER.
Using the control panel the UPS can easily be
transferred to the ON-LINE-Mode. The ON-LINE-Mode provides the highest degree of protection, especially in the
event of a mains disturbance or failure. This operating mode is always recommended if the critical loads (computer
systems) will not tolerate any interruption of the supply (not even the shortest). In the unlikely event of an inverter
fault or overload condition the UPS will transfer the load automatically and without interruption to the static bypass-
mains supply (transfer time = 0).
6.6.2 Mode"OFF-LINE"(ECO- or BYPASS MODE)
In the "OFF-Line Mode”, the load is supplied from the mains through the static bypass. Using the control panel the
UPS may be easily transferred to "Bypass Mode”.
When the UPS is operating in "Bypass Mode”, the
efficiency of the system is higher. In the event of a mains failure the load will automatically be transferred from
mains to inverter within 5 msec (this is valid for single and parallel systems). The battery charger remains active in
the "Bypass-Mode”.
The "Bypass-Mode”, is recommended only if the loads can tolerate interruptions of 3-5 ms (transfer time from
Bypass Mode to ON-LINE Mode).
NOTE!
TO HAVE THE MOST ESSENTIAL SECURITY LEVEL, WE RECOMMEND TO RUN
THE UPS ON NORMAL OPERATION MODE, MEANS ON-LINE MODE.
6.6.3 "MAINTENANCE BYPASS" - Mode
Before transferring the load to Maintenance Bypass (IA1) always make sure all the UPS-modules are in the
"Bypass-Mode” or “ECO-Mode”. The Maintenance Bypass mode is performed by closing (put in position ON) the
IA1 Maintenance Bypass switch on the front of the UPS.
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