
28
PCS100 AVC-20
User Manual
Sine Filter
Fuses
IGBT
RFI
Filter
U
V
W
+ Bus
- Bus
SCR/Contactor
BYPASS
Fuses
Figure 5
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5: PCS100 AVC
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20 inverter diagram
5.1.3
Fail Safe Bypass
Power quality equipment must
be more reliable than the utility and must never “drop” or “lose” the load, the
internal bypass is an important component to meet this requirement
The Fail-Safe Bypass circuit is designed to remove the output inverter from the circuit during overload or manual
bypass operating modes, by shunting the inverter side of the injection transformer.
Based on the combination of high-speed power electronic SCR switches and mechanical contractors, the Fails
Safe Bypass provides two level redundancy for very fast and secure seamless shunting of the inverter without
impact on the load.
5.1.4
Auxiliary Master Module
The Auxiliary Master Module controls the overall system operation from a central point. It coordinates the
function of the slave modules. The master controls the operating state of the system and combines the
measurements and feedback from the input and output slaves into a single data set. It also identifies significant
events in the external world (supply and load) and the internal system (state of slave modules) and stores them in
an event log. It performs the system wide input voltage sensing and calculates the reference values for the slaves.
Additionally, the Auxiliary Master Module includes:
an auxiliary supply used for PCS100 module electronics and fan supply,
IO module for external control and monitoring purposes.
Control and monitoring wiring is explained in Section 11
Figure 5
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6: PCS100 AVC
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20 Auxiliary Master Module