Eaton PDI WaveStar TFA Static Transfer Switch Installation and Operation Manual P-164001113—Rev 01
69
6.
The logic locks the load on Source 2 for 100 ms, allowing the source voltage to stabilize, and the load is not
dropped.
Example B:
1.
Source 1 is the Preferred Source and is supporting the load.
2.
Source 2 experiences an outage (load remains on Source 1).
3.
While Source 2 is unavailable, Source 1 experiences an 8 ms transient outage.
4.
The load remains connected to Source 1 even though both sources experience outages for 8 ms.
99..22
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Redundant Mode is entered when the
MODE OF OPERATION
toggle switch is set to
REDUNDANT
.
In Redundant Mode:
•
The SAS board controls transfers and Monitor logic is bypassed.
•
"Retransfer Yes/No" is not a setting on the ROI panel and retransfer does not apply: The SAS board has no
memory of previous transfers; it simply transfers when the current source is out of specification and the
other source is within specification.
•
Preferred Source does not apply:
–
Automatic transfers: When the currently active source goes out of specification, the SAS board will
transfer to the alternate source if it is within specification.
–
Manual transfers: Using the momentary
SOURCE SELECTOR
toggle switch causes a transfer to the
selected source, if it is not already on that source.
Redundant Mode is also entered if the SAS board detects the Monitor has failed. The SAS board then performs
the load transfer.
99..33
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The STS has a Bypass Mode for maintenance. In Bypass Mode all electronic components are isolated from the
power sources to allow safe unit servicing.
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Bypass Mode is entered by physically setting up MCSWs to go to bypass. The STS has keyed-interlocked
bypass MCSWs allowing logic to be disconnected from power sources without interrupting output load power
(See
). Engaging the bypass and returning from bypass to STS normal mode both require the operator
to manipulate the integrated keyed interlocks (or alternatively Kirk Keys) and MCSWs.
Summary of Contents for PDI WaveStar TFA STS 250-600A
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