Section-4
04-3004_S4_OPM_ABB_POWERSCALE_10-50kVA_EN_150113.doc Page 7/8 ABB
Printed in Switzerland – Modifications reserved
4.1.4 OPERATING MODES
4.1.4.1 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 (see figure 1.1), 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).
4.1.4.2 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 (see figure 1.1), 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 ms (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).
TO HAVE TO MOST ESSENTIAL SECURITY LEVEL, WE RECOMMEND TO
RUN THE UPS ON NORMAL OPERATION MODE, MEANS UPS MODE.
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