WaveStar Static Transfer Switch 2000A 3-Pole
16
Ctrl Nr: PM375118-004
by the Simple Algorithm Switch (SAS), which provides a backup transfer process using a simpler algorithm, if the
Monitor fails.
In Bypass Mode operation (Figure 7), operators isolate logic and power components for maintenance by changing
the open/closed MCCB and MCSW states. Kirk Keys enforce correct coordination between breakers, preventing
cross-currents between sides.
1.5
High Availability through Redundancy
To keep a mission-critical load continuously supplied with power, the STS must itself be continuously operational.
To the fullest extent practical, the STS 2000A employs redundant circuits and components to eliminate single
points of failure.
•
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/ITS 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.
Source (Input) 1 and 2
MCCBs are open.
Isolation MCSW 1 is
open.
Bypass MCCB 2 is open.
Bypass 1 MCCB is
closed.
STS is on
Bypass 1
.
Bypass 1 is the active
power path (yellow).
When the STS is on
Bypass 2
,
-Bypass 1 MCCB is open.
-Bypass 2 MCCB is closed.
One-line Diagram is
from the Home screen.
Figure 7 STS on Bypass (Bypass 1)
