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Eaton Static Transfer Switch 2000A 3-Pole Installation and Operation Manual 164001127—Rev 01
7
Transfer algorithms move the load to the other source. Transfers are not performed by connecting the two
sources (“Make before Break”), which would cause cross-currents between sources.
Administrators can choose between two transfer algorithms using the front panel touchscreen:
•
POG (Power or Gate)
(fast) algorithm transfers the load as quickly as possible from one source to another
without connecting the sources together.
–
Automatic transfers including sense time are ≤ 1/4 cycle for all phase conditions.
–
Manual transfers are ≤ 1/8 cycle for in-phase conditions (phase-synchronized sources).
•
VSS (low inrush)
algorithm transfers the load in 3/4 of a cycle or less, including sense time, and will
balance the volt seconds of any magnetic load so as to not draw in-rush current.
–
Automatic transfers are ≤ 3/4 cycle for all phase conditions, including sense time.
–
Manual transfers are ≤ 1/8 cycle for in-phase conditions.
The STS 2000A can successfully switch the load between sources that are 180
⁰
out-of-phase within the above-
specified cycle times.
VSS is the recommended and default algorithm and should be used whenever there are transformers
downstream of the STS, including small transformers embedded in devices. The POG algorithm can be used
when there are no downstream transformers.
11..44
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There are three sets of Molded Case Circuit Breakers (MCCBs) or Molded Case Switches (MCSWs) controlling
whether the system is in Normal or Bypass Mode and two sets of SCRs, which provide power switching for
transfers:
Source 1 MCCB and Source 2 MCCB are breakers from the two power sources to the SCRs.
SCR 1 and SCR 2 open or close to control which source powers the load.
Bypass 1 MCCB and Bypass 2 MCCB are used to shunt power around STS logic and power switching
elements for maintenance.
Isolation 1 MCSW and (optional) Isolation 2 MCSW isolate components for maintenance during Bypass Mode.
The second optional isolation MCSW provides redundancy.
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