Installation and User Manual

The shutdown of one inverter results in overload on the other inverters in operation. Two cases may then arise:

A)if the overload on each remaining inverter is > than 1.65 in, the load is immediately transferred to the bypass AC source.

B)if the overload is less than 1.65 in, the remaining inverters support the overload (see curve in Figure 4-11), and the load is transferred to the bypass AC source.

After this transfer:

-the light 4 goes off,

-the buzzer is activated and sounds continuously,

-the light 3 goes on and turns green,

-the message "LOAD NOT PROTECTED, PARALLEL ON-LINE MODE" is displayed.

Figure 4-11: Overload Curve Diagram.

I

1,5 In

1,35 In

1,25 In

1,15 In

1,10 In

1,05 In

In

1 2 3 4 5 6 7 8 9 10

30

120 t (min)

4.6.3Parallel UPS With Redundancy

The shutdown of one UPS unit is of no consequence for the load. The others each take up an equal amount of load power and the load continues to be supplied normally.

◗Unit shutdown results in the following on the control panel:

- Lights 4 and 5 go off,

-Activation of the buzzer (continuous beep),

-The message "LOAD NOT PROTECTED, PARALLEL ON-LINE MODE" is displayed.

-In the event of an overload, the system only loses its redundancy as long as the overload is less than the total rated power of the functioning units. If the overload is greater, the operating mode is that previously described for systems without redundancy.

4.7Output Voltage Quality and Continuity

The output voltage is stable in amplitude and frequency and is free of interruptions or transients outside specified tolerances, irrespective of normal AC source or load disturbances (outages, load step changes, etc.).

86-133060-00 A00

Operation

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