Static Bypass Switch (Sbs) - AEG Protect 5.31 Series Operating Instructions Manual

5.3

Static Bypass Switch (SBS)

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Protect 5.31/xxx-480-220-120 10 kVA - 120 kVA
SBS circuit
SBS control unit
Figure 12 Functional principle of the SBS control unit
The SBS control unit monitors the voltages of the load circuit and the
SBS incoming mains and, in the event of an overload or inverter fault,
initiates switchover of the load to the SBS circuit without interruption
(providing the SBS circuit is in the permitted tolerance range). The
load circuit is then supplied via the thyristor contactor. As soon as the
output voltage of the inverter returns to the permitted tolerance range,
the load circuit is automatically switched back to the inverter (INV),
also without any interruption.
Switchover from the INV to the SBS circuit and back can also be carried
out by the UPS operator by manually switching the INV OFF or ON.
The SBS control unit initiates and monitors synchronisation of the
INV voltage with the SBS circuit. If these two circuits are not
synchronised, the DOU displays "phase deviation".
NOTE:
If during "phase deviation" it is necessary to switch the loads over
from the INV to the SBS circuit or if the INV is switched off,
switchover to the SBS circuit takes place with a voltage gap.
Depending upon customer requirements, the switchover can be
blocked if there is a "phase deviation". This operating mode
becomes necessary if the connected loads could not withstand
such a voltage gap without suffering damage.
The SBS circuit voltage at terminal X4 is monitored by the SBS
control unit. If the SBS circuit voltage is not within the permitted
tolerance range, the SBS is blocked!
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SBS trigger circuit
SBS interface
Loads
8000020680 BAL, en