Fail Safe Bypass; Auxiliary Master Module - ABB PCS100 AVC-20 User Manual

28 PCS100 AVC-20 User Manual
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+ Bus
- Bus
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 su pply,
IO module for external control and monitoring purposes.
Control and monitoring wiring is explained in Section 11
IGBT
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Figure 5-5: PCS100 AVC-20 inverter diagram
Figure 5-6: PCS100 AVC-20 Auxiliary Master Module
Sine Filter
SCR/Contactor
BYPASS
RFI
Filter
U
V
W