Automatic bypass operation

 

In VFI (Voltage Frequency Independent) operation

 

mode, the load is permanently supplied by the

 

inverter but, in case of trouble on the inverter, or

 

when overload or short-circuit on the output

 

occur, if the mains voltage do not exceed the

 

admitted tolerances, the load is instantly

 

transferred to the mains through the automatic

 

bypass, taking advantage of the higher short

 

circuit power.

Fig. 3.2-3 Energy flow in automatic bypass operation

When the inverter recovers, the load will be re-transferred automatically to the inverter.

In case of parallel system

Each unit has its own bypass.

All the bypasses in the system work together, their control being managed in the same manner by all units.

The units are continuously exchanging information before taking such decision. In case the inverter of one unit fails, its bypass remains operating.

It is excluded only if the unit is separated from the common bus by opening its output switch Q1.

Mains recovery operation

As soon as the mains recovers, the rectifier starts up automatically supplying the inverter and the battery-chargerrecharges the battery.

In case the inverter has been shut down following a complete discharge of the battery, when the mains recovers the system start up automatically.

Fig. 3.2-4 Energy flow at mains recovery operation

When the energy stored in the battery is sufficient to ensure a minimum time of operation with the actual load, in case of a future mains failure, the load will be retransferred to inverter (if selected VFI Mode).

In case of parallel system

When the AC input power recovers, the rectifiers will start up sequentially according to their number in the parallel system in order to avoid an initial inrush current.

The inverters will start up automatically, but only when the battery has recharged enough for a minimum runtime with the present load.

When enough inverters to supply the load have been restarted, the load will be transferred from the automatic bypass back to the inverter bus-bars.

Modifications reserved

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OPM_LPS_3UO_30K_40K_0US_V010.doc

Operating Manual LP 33 Series 30 & 40 kVA

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GE LP 33 manual Automatic bypass operation, Mains recovery operation

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