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8 Smart Distribution Panel with ATS
Open and closed transfers
When a transfer is not occurring, one switch is ON and the second switch is OFF.
During a closed transfer, the second switch will turn ON before the first switch turns OFF, creating a
brief period of time when both switches are ON.
During an open transfer, the first switch will turn OFF before the second switch turns ON, creating a
period of time when neither source is connected (neutral time).
You can set whether or not to Allow Closed transfers under the Transfer Setup item on the ATS
Setup menu on the display interface. (See page 35 for details on these settings.) If the Allow Closed
setting is Yes, the ATS will always seek to perform closed transfers. In order for a closed transfer to
occur, the voltage and frequency for both sources has to be good; in addition, a closed transfer cannot
occur if the two sources are not synchronized. The ATS monitors for both sources to be synchronized
before transferring. If the time it takes for the sources to be synchronized exceeds the configured
Max Sync Time, the ATS will perform an open transfer instead. During a closed transfer, the ATS
also takes into account the time it takes for the switch to actuate, which creates a seamless transfer—
non-UPS-protected equipment will not be interrupted and the UPS time on battery will be reduced,
and in some cases, eliminated.
If the Allow Closed setting is No, the ATS will never perform closed transfers—it will always
perform open transfers. (See page 35 for details on these settings.) During an open transfer, the first
switch will turn OFF before the second switch turns ON, creating a period of time when neither
source is connected. This period is commonly referred to as the neutral time. The neutral time is
defined by the configurable Open Xfer Time.
Closed Transfer
Source 1 Source 1 Source 2
Source 2
Open Transfer
Source 1 Neutral Source 2