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Tecnoware Power Systems
3.1.3 STATIC COMMUTATOR
The static commutator indicated in picture 5 as B.S., is a commutator made with semiconductors which can select
which power source to connect appliances to. During normal functioning the U.P.S. output is taken at the inverter output
(U.P.S. on-line), but if there is an internal or external event it will commute to the reserve system.
Commutating from one source to another occurs without creating voltage "dips" only with
conditions of synchronism between inverter output and the reserve system. If there is forced
commuting, without synchronism, decided by the user, this will occur with a voltage dip of max.
20 Sm.
3.2 DESCRIPTION AND PARTS
During normal functioning (picture 6) the system takes power from the mains by means of
the input terminal (B). The voltage goes through the disconnecting switch and the fuse board
in order to reach the rectifier module (C), exiting which is a continuous controlled voltage
available to charge or maintain battery efficiency and to the inverter input (E). This step is to
generate a three-phase voltage, stabilized and synchronized with the back-up voltage. The
static commutator (F) selects the power source to power the load, usually on inverter (E). If
there is an increase of output current or with specific alarms, the device (F) will commutate to
the emergency supply (A) maintaining output continuity. If transferring takes place, output
continuity is allowed by the synchronism of the voltages generated with the emergency
voltage. If asynchronous commutation should take place there will be a power "dip" for
maximum 20 ms.
EVO STAR 10-50
Commuting Conditions on inverter:
1.
Inverter switched on and working and synchronized with the
reserve system
2.
Loss of system
3.
Voluntary forcing through control panel
Commuting Conditions on reserve:
1. Malfunctioning of the inverter
2. Current overcharge
3. U.P.S. switched off
4. Voluntary forcing through control panel
5. By-manual closing of the breaker
Picture 6
13
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