Eaton PDI WaveStar TFA Static Transfer Switch Installation and Operation Manual P-164001113—Rev 01
13
Figure 8. STS on Bypass (Bypass 1)
22..66
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•
The STS is designed for an
MTBF
exceeding 2,000,000 hours.
•
The STS has dynamic
tri-redundant logic
with voting circuits. Each level monitors the power being
supplied to the load; if one level does not transfer the load in specified times, the second level will transfer
the load within the CBEMA curve.
•
The STS has
quad-redundant gate drivers
, redundant drivers for each set of SCRs. The drivers cannot
inhibit or out vote the other. Therefore, both source 1 and source 2 SCRs have two levels of isolated,
independent gate drivers.
•
The STS has
tri-redundant logic power supplies
. The configuration of each DC logic power supply is
such that a short circuit on one PCB cannot prevent the other PCBs from receiving tri-redundant power.
Each PCB receives logic power via three isolated connectors.
•
The STS has
N+3 fan redundancy
for forced air-cooling of the SCRs.
•
The STS uses
tri-redundant fiber optic lite
pipes and circular redundant CAN Bus to route logic signals
between logic PCBs.
•
Noise immune signal buses
: the STS uses optical buses and/or CAN buses to route signals between
logic PCBs.
–
All signal buses are tri-redundant.
–
Each signal bus continuously transmits “bus integrity” signals, when not transmitting true data. If the
“bus integrity” signals are not received by all receivers, then that bus is considered discontinuous and
is alarmed.
–
The CAN Bus has circular redundancy so that there are two paths. One path can be severed and
signals will continue to flow via the other path.
•
The STS has two levels of operator controls and status displays. The Monitor and display is backed up by
the Redundant Operator Interface (ROI).
Summary of Contents for PDI WaveStar TFA STS 250-600A
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